Thanks for yours answers!

what did you mean by pros and cons of any statistical methods?

anxiety is measured as never, sometimes, often, always. it is an
ordinal scale.

the second variable measures the frequencies of a particular thought
that ocur in 2 minutes. there are scores from 0, 1, 4 to , 76, 99.

so, to compute biserial, I have to transform this scores so that they
are measured on an ordinal scale?

Thank you! Any help very much appreciated!




--- In Statisticians_group@..., Sanjib Meitei
<sanjibmeiteicha@...> wrote:
>
> Dear Dr. Khalifa Elmusharaf,
>   thanks for sharing ur knowledge with us. Anyway, i gave a general
reply to one of the questions.
>   Since, on of the two variables under consideration by Khalifa
Elmusharaf  was Anxiety , which is often expressed as dichotomous
(High, low...........anxiety can take on any value inbetween, perhaps
beyond, but it may be difficult to measure ), with underlying
continuity and normality, I still think that biserial would be useful
for finding the measure of association of the two variables.
>
>   One has to remember that, while measuring the association of two
variables with different measurement levels, one variable has to be
transformed to a new variable with measurement level same with the
other one(preferably to lower level...nominal<ordianl<ratio) . This
process is associated with a lot of compromise on the strength of the
statistical test applied.
>   So, the best solution is that the person better to to consider
all the pros and cons of any statistical methods before taking any
inferences.
>
>   regards
>   Sanjib Meitei
>   Biostatistician
>
>
>
>
>
>
> Khalifa Elmusharaf <khalifa_elmusharaf@...> wrote:
>             Dear paullucian szasz and Sanjib Meitei
>
>   Greetings,
>
>   Biserial correlation is used when an interval variable is
correlated with a dichotomous variable which reflects an underlying
continuous variable. Biserial correlation is rarely used any more,
with polyserial/polychoric correlation now being preferred. Biserial
correlation is not supported by SPSS but is available in SAS as a
macro.
>
>
>   Spearman's rho is the most common correlation for use with an
ordinal and an interval variable. Rho for ranked data equals
Pearson's r for ranked data. Note SPSS will assign the mean rank to
tied values. The formula for Spearman's rho is:
>
>   rho = 1 - [(6*SUM(d2)/n(n2 - 1)]
>
>   where d is the difference in ranks. In SPSS, choose Analyze,
Correlate, Bivariate; check Spearman's rho.
>
>
>   Kendall's tau is another common correlation for use with an
ordinal and an interval variable. Prior to computers, rho was
preferred to tau due to computational ease. Now that computers have
rendered calculation trivial, tau is generally preferred. Partial
Kendall's tau is also available as an ordinal analog to partial
Pearsonian correlation. In SPSS, choose Analyze, Correlate,
Bivariate; check Kendall's tau.
>
>
>   Regards,
>
>   Dr. Khalifa Elmusharaf
>   Registrar OB & GYN
>   Biostatistician
>   Faculty of Medicine
>   University of Medical Sciences & Technology
>   Khartoum – Sudan
>   www.amst-edu.com
>
>
> Sanjib Meitei <sanjibmeiteicha@...> wrote:       Biserial rb would
be appropriater for such analysis
>
> paullucian_szasz <paullucian_szasz@...> wrote:         Hi, everyone!
>   How can I compute a correlation test for two set of data that are
one set ordinal scale from an anxiety test (never, sometimes, often,
etc) and the second set of data is in frequencies - ratio scale ?
>   The second set o data is from 2 groups (experimental and
control), and the distributions are asymmetrical. and I have no idea
how to compute or what type of nonparametric test is good for my
data. I need to compare 2 groups in first setting (variable
manipulated or treatment) and see the diferences, and the same 2
groups (20 subject in each group) in the second setting (no
treatment) and see the diferences.
>   And then test if there is a relationship of the effects obtained
with the results from the scale. Here I want to see if or how the
results correlate.
>   Thank you!
>
>
>
>
>
>
>
>
>
>
>
>
> ---------------------------------
>   Unlimited freedom, unlimited storage. Get it now
>
>
>
>
>
> ---------------------------------
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you're surfing.
>
>
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> ---------------------------------
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>

Dear paullucian szasz and Sanjib Meitei

Greetings,

Biserial correlation is used when an interval variable is correlated with a dichotomous variable which reflects an underlying continuous variable. Biserial correlation is rarely used any more, with polyserial/polychoric correlation now being preferred. Biserial correlation is not supported by SPSS but is available in SAS as a macro.

Spearman's rho is the most common correlation for use with an ordinal and an interval variable. Rho for ranked data equals Pearson's r for ranked data. Note SPSS will assign the mean rank to tied values. The formula for Spearman's rho is:

rho = 1 - [(6*SUM(d2)/n(n2 - 1)]

where d is the difference in ranks. In SPSS, choose Analyze, Correlate, Bivariate; check Spearman's rho.

Kendall's tau is another common correlation for use with an ordinal and an interval variable. Prior to computers, rho was preferred to tau due to computational ease. Now that computers have rendered calculation trivial, tau is generally preferred. Partial Kendall's tau is also available as an ordinal analog to partial Pearsonian correlation. In SPSS, choose Analyze, Correlate, Bivariate; check Kendall's tau.

Regards,

Dr. Khalifa Elmusharaf

Registrar OB & GYN

Biostatistician

Faculty of Medicine

University of Medical Sciences & Technology

Khartoum – Sudan

www.amst-edu.com

Sanjib Meitei <sanjibmeiteicha@yahoo.co.in> wrote:

Biserial r_b would be appropriater for such analysis

paullucian_szasz <paullucian_szasz@yahoo.co.uk> wrote:

Hi, everyone!

How can I compute a correlation test for two set of data that are one set ordinal scale from an anxiety test (never, sometimes, often, etc) and the second set of data is in frequencies - ratio scale ?

The second set o data is from 2 groups (experimental and control), and the distributions are asymmetrical. and I have no idea how to compute or what type of nonparametric test is good for my data. I need to compare 2 groups in first setting (variable manipulated or treatment) and see the diferences, and the same 2 groups (20 subject in each group) in the second setting (no treatment) and see the diferences.

And then test if there is a relationship of the effects obtained with the results from the scale. Here I want to see if or how the results correlate.

Thank you!

 

 

 

 

 

 

 

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Biserial r_b would be appropriater for such analysis

paullucian_szasz <paullucian_szasz@yahoo.co.uk> wrote:

Hi, everyone!

How can I compute a correlation test for two set of data that are one set ordinal scale from an anxiety test (never, sometimes, often, etc) and the second set of data is in frequencies - ratio scale ?

The second set o data is from 2 groups (experimental and control), and the distributions are asymmetrical. and I have no idea how to compute or what type of nonparametric test is good for my data. I need to compare 2 groups in first setting (variable manipulated or treatment) and see the diferences, and the same 2 groups (20 subject in each group) in the second setting (no treatment) and see the diferences.

And then test if there is a relationship of the effects obtained with the results from the scale. Here I want to see if or how the results correlate.

Thank you!

 

 

 

 

 

 

 

---

Unlimited freedom, unlimited storage. Get it now

Hi, everyone!

How can I compute a correlation test for two set of data that are one set ordinal scale from an anxiety test (never, sometimes, often, etc) and the second set of data is in frequencies - ratio scale ?

The second set o data is from 2 groups (experimental and control), and the distributions are asymmetrical. and I have no idea how to compute or what type of nonparametric test is good for my data. I need to compare 2 groups in first setting (variable manipulated or treatment) and see the diferences, and the same 2 groups (20 subject in each group) in the second setting (no treatment) and see the diferences.

And then test if there is a relationship of the effects obtained with the results from the scale. Here I want to see if or how the results correlate.

Thank you!

 

 

 

 

 

 

 

Hi, everyone!

How can I compute a correlation test for two set of data that are one set ordinal scale from an anxiety test (never, sometimes, often, etc) and the second set of data is in frequencies - ratio scale ?

The second set o data is from 2 groups (experimental and control), and the distributions are asymmetrical. and I have no idea how to compute or what type of nonparametric test is good for my data. I need to compare 2 groups in first setting (variable manipulated or treatment) and see the diferences, and the same 2 groups (20 subject in each group) in the second setting (no treatment) and see the diferences.

And then test if there is a relationship of the effects obtained with the results from the scale. Here I want to see if or how the results correlate.

Thank you!

Does it have any advantage over time series in R
(http://www.r-project.org)?

Patrick Burns
patrick@...
+44 (0)20 8525 0696
http://www.burns-stat.com


Priyantha Wijayatunga wrote:

>
>
> ---------- Forwarded message ----------
> From: *Hansi Rostler* <johann_rost@...
> <mailto:johann_rost@...>>
> Date: Jul 26, 2007 3:07 PM
> Subject: Free statistical software & C++ code
>
>
> I have uploaded a free software package for statistical time series
> forecasting. It includes ARMA, exponential smoothing, linear regression
> and several trend and seasonal models. There is also C++ source code
> according the GNU license (GPL)
>
> The URL is
>
> www.donquixote.eu
>
>

--- phumke2004 <phumke2004@...> wrote:

> u are highly welcome.I'm dalas Doris;a NIGERIAN
> INDEED
>
>
Hi,
Mangesh welcoming you.
manraj12670@...


       Get the freedom to save as many mails as you wish. To know how, go to
http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html

Hellow staticians group.I'm a young lady of Mathematics students and
hope to have M Sc on Statistics, Can u help me with the area to
specilize on in Statistics?

Hi Members,

I am interested to know about  closed and ordered test of hypotheses.
I believe this plays good role in the field of Biostatistics. It would
be great help for me if anybody explain the concept or refer me any
online resources or books.

Thanks in advance.

Regards,
Madan Kundu
Biostatistician

From job point of view, Biostatistics usually has the
highest number of openings and should be a good
specialization to consider.  Relevant jobs are in
clinical trials, biotechnology etc.

However one other area is growing very fast and has
lot more demand than supply.  This is the area of
Analytics/Business Analytics.  Think of this field of
expertise too.

Thanks,

Pradipta.


--- phumke2004 <phumke2004@...> wrote:

> Hellow staticians group.I'm a young lady of
> Mathematics students and
> hope to have M Sc on Statistics, Can u help me with
> the area to
> specilize on in Statistics?
>
>



      
________________________________________________________________________________\
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Shape Yahoo! in your own image.  Join our Network Research Panel today!  
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u are highly welcome.I'm dalas Doris;a NIGERIAN INDEED

Hellow staticians group.I'm a young lady of Mathematics students and
hope to have M Sc on Statistics, Can u help me with the area to
specilize on in Statistics?

> Dear all,
>
>
>
> Hope you all will be in best of health and job!
>
> I have a query ,I am working on some physical measurements’ data and I have
> to find Repeatability & Reproducibility of that specific data I just
> wanted to know is there any specific formula for calculation r and R
> (repeatability and reproducibility ) I have searched many sites but didn’t
> find any specific formula
> Kindly anybody can tell me how I calculate
>
> -Repeatability
> -Reproducibility
> -95% Confidence interval of both
>
> As per my understanding CI calculation will be same as normally we
> calculate.
>
> Looking forward to your reply
>
> Thanks & Best Regards,
>
> Zubdah Zafar
>
>
>
> Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail,
> news, photos more.
>
>
>

---

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---

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Dear Zubdah
 
Following is my understanding and hope fully it will solve your problem.
Also attached file contained formula for R&r.
Regards
 
Sharjeel
 

¨       Reproducibility (R) and Repeatability (r)

 

-          R & r Tables

-          R & r Graphs

 

Reproducibility and repeatability are two measures of precision and both are used to describe the variability of a test method.

 

2 Sets of data were analyzed for the R & r, i.e. with and without removal of outliers.  The Box-and-Whisker plots analysis were used to remove extreme outliers’ values prior to further statistical analysis of the data.

  

Reproducibility (R)

 

Definition: The closeness of agreement between the tests results obtained under reproducibility conditions.

 

On average, single result from matching any samples reported by two laboratories will differ by more than the reproducibility values (R) not more than once in 20 cases if the normal and correct operation of the method is followed.

 

Repeatability (r)

 

Definition:  The closeness of agreement between mutually independent test results obtained under repeatability conditions

 

On average, the difference between two single results from matching any samples obtained by one operator using the same apparatus within the shortest feasible time interval will exceed the repeatability value (r) not more than once in 20 cases if the normal and correct operation of the method is followed.

 

In other words, R & r, can be defined as an established value at a given parameter level below which the absolute difference between two inter-laboratory test results may be expected to fall with a specified probability (0.05)

 

 

R & r Calculations

 

R = 2.8 s_R

r = 2.8 s_r

 

Where:	sr    =	Repeatability standard deviation between laboratories as expressed by Ö S s˛ / p
	sR   =	Reproducibility standard deviation among laboratories as expressed by the larger of (sr and Ö (sxavg)˛ + (sr) ˛ +  (sr) ˛  (n-1)/n)
	s     =	Standard deviation of an individual laboratory
	p     =	Number of laboratories
	sxavg =	The standard deviation of the laboratories’ averages as expressed by   p Sd˛ / (p-1) 1
	d    =	The difference of the individual laboratory’s average from the overall average of the laboratories

 

 >
> (See attached file: R&r formula.doc)
>
>
>
>
>
>
>
>
> Zubdah Zafar
> <zubdahzafar@yaho
> o.com> To
> Sent by: Statisticians_group@....
> Statisticians_gro in
> up@... cc
> .in
> Subject
> [Statisticians_group] Repeatability
> 07/09/2007 08:10 & Reproducibility
> AM
>
>
> Please respond to
> Statisticians_gro
> up@...
> .in
>
>
>
>
>
>
> Dear all,
>
>
>
> Hope you all will be in best of health and job!
>
> I have a query ,I am working on some physical measurements’ data and I have
> to find Repeatability & Reproducibility of that specific data I just
> wanted to know is there any specific formula for calculation r and R
> (repeatability and reproducibility ) I have searched many sites but didn’t
> find any specific formula
> Kindly anybody can tell me how I calculate
>
> -Repeatability
> -Reproducibility
> -95% Confidence interval of both
>
> As per my understanding CI calculation will be same as normally we
> calculate.
>
> Looking forward to your reply
>
> Thanks & Best Regards,
>
> Zubdah Zafar
>
>
>
> Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail,
> news, photos more.
>
>
>

---

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Hallo

   we are now studied in M.Sc. (Industrial Statistics)

so our question is that " What is p-value concept in ANOVA ?

  please send in brief

---

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Your way to the science...

I just want to ask if R-Chart,or the control limit is applicable to
verify the outlierr in the extreme values or time-series


--- In Statisticians_group@..., Ted Bonitez
<teodybonitez23@...> wrote:
>
> I 'am also interested in working with extreme values. Currently
there is no other method of detecting extreme values rather than
graphicl e.g. Box and whisker plot ans stem and leaf plot
>
>   where should we start?
>
> surendra barsode <sbbarsode@...> wrote:
>             Respected Sir,
>
>   I am keen on fitting of data using EVT for extreme loss events
in a bank's operaional risk losses.
>
>   I would like to work on this topic. I would like to seek you
guidance on this topic.
>
>   Please advise me how should i proceed.
>
>   Surendra Barsode
>
> mscotto <mscotto@...> wrote:
>
>     Hi everyone!
>
>
>   I am seeking for people interested in working in Extreme Value
Theory and/or time series analysis (bilinear models and/or INAR
models)
>
>   Best
>
>   Manuel
>   *************************************************
> Manuel González Scotto
> Department of Mathematics
> University of Aveiro
> Campus de Santiago
> 3810-193 Aveiro, Portugal
> Telef: +351 234 370 359 Ext: 23407
> email: mscotto@...
> http://www.mat.ua.pt/mscotto/
> *************************************************
>
>
>
>
>
>
>
>
>
> ---------------------------------
>   Take the Internet to Go: Yahoo!Go puts the Internet in your
pocket: mail, news, photos more.
>
>
>
>
> ---------------------------------
> Be a better Globetrotter. Get better travel answers from someone
who knows.
> Yahoo! Answers - Check it out.
>

Respected Sir,

 

I am keen on fitting of data using EVT for extreme loss events in a bank's operaional risk losses.

 

I would like to work on this topic. I would like to seek you guidance on this topic.

 

Please advise me how should i proceed.

 

Surendra Barsode

mscotto <mscotto@mat.ua.pt> wrote:

 

Hi everyone!

 

I am seeking for people interested in working in Extreme Value Theory and/or time series analysis (bilinear models and/or INAR models)

 

Best

 

Manuel

*************************************************
Manuel González Scotto
Department of Mathematics
University of Aveiro
Campus de Santiago
3810-193 Aveiro, Portugal
Telef: +351 234 370 359 Ext: 23407
email: mscotto@mat.ua.pt
http://www.mat.ua.pt/mscotto/
*************************************************

---

Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos more.

 

Hi everyone!

 

I am seeking for people interested in working in Extreme Value Theory and/or time series analysis (bilinear models and/or INAR models)

 

Best

 

Manuel

*************************************************
Manuel González Scotto
Department of Mathematics
University of Aveiro
Campus de Santiago
3810-193 Aveiro, Portugal
Telef: +351 234 370 359 Ext: 23407
email: mscotto@mat.ua.pt
http://www.mat.ua.pt/mscotto/
*************************************************

 

Hi everyone!

 

I am seeking for people interested in working in Extreme Value Theory and/or time series analysis (bilinear models and/or INAR models)

 

Best

 

Manuel

*************************************************
Manuel González Scotto
Department of Mathematics
University of Aveiro
Campus de Santiago
3810-193 Aveiro, Portugal
Telef: +351 234 370 359 Ext: 23407
email: mscotto@...
http://www.mat.ua.pt/mscotto/
*************************************************

Please check the chapter on the Student 't' test in alomost any
introdcutory stat text.  It takes most of one chapter to cover the
questions you raised.

And BTW, it works for continuous scale data - ratio or otherwise
scale.  And arguably an ordinal scale under some circumstances.

Jay
On Jul 16, 2007, at 9:20 PM, Vincent wrote:

> Hi there you guyz!!!
>
> Could you please help me to clarify some
> terms/methodologies/principles/rules and assumption of the the
> following Statistical Test
>
> T-Test = What is T-Test?
>          When to use T-Test?
>          What are the Assumption in using T-test?
>          What data needed in order for the T-Test be
> applicable.What if
>          the data is nominal,or ordinal. Is t-Test applicable to
> nominal                      or ordinal? is nominal continuous or
> nominal discrete data applicable for T-test? What if the data is
> ordinal continuous? Is t-Test still applicable.
>
> Same questions with ANOVA(One-way and Two-way ANOVA), Chi-Square,
> Pearson R, Spearman Rho...etc..
>
> guys if you have some powerpoint presentation or lectures on that
> matter, please do send me in the group or privately: Vin_zed@...
>
>
>
> ______________________________________________________________________
> __
> NOTE: The Statisticians_group is for discussing on different issues
> related to the subject Statistics, Statistical softwares like SAS,
> SPSS etc. The users are encouraged to post jobs those are
> exclusively for Statisticians like data analyst, business analyst etc.
>
> Please don't post or send any SPAM!
>
> NOTE: Please don't use this mail for any personal discussion.
>
> ______________________________________________________________________
> __
>
>
> Yahoo! Groups Links
>
>
>
>

Jay Warner
Principal Scientist
Warner Consulting, Inc.
4444 North Green Bay Road
Racine, WI 53404-1216
USA

Ph:       262.634.9100
Fax:     262.681.1133
email:  quality@...
web:    www.a2q.com

The A2Q Method (tm) -- What do you want to improve today?

Hi there you guyz!!!

Could you please help me to clarify some
terms/methodologies/principles/rules and assumption of the the
following Statistical Test

T-Test = What is T-Test?
          When to use T-Test?
          What are the Assumption in using T-test?
          What data needed in order for the T-Test be applicable.What if
          the data is nominal,or ordinal. Is t-Test applicable to
nominal                      or ordinal? is nominal continuous or
nominal discrete data applicable for T-test? What if the data is
ordinal continuous? Is t-Test still applicable.

Same questions with ANOVA(One-way and Two-way ANOVA), Chi-Square,
Pearson R, Spearman Rho...etc..

guys if you have some powerpoint presentation or lectures on that
matter, please do send me in the group or privately: Vin_zed@...