Dear Amy,

The main purpose of data validation before using the
model is to see whether the the sample data is true
representative of the population. If it is not, there
is considerable model risk.Though basically I am risk
modeler in financial risk management, same principal
could be extended to your case in clinical research.
It is important is to see whether the sample is true
representative of the population and there is minimum
bias. Or the model may not give true result.

Kind Regards,

Debashis
--- moccalatte2003
<amoore@...> wrote:

> Dear Kaushik,
>
> I am a statistician with data management background.
> Data management
> in terms of clinical research data means ensuring
> that the data
> collected is accurate and valid. This may not be the
> case in finance.
> But for clinical trials where you are trying to get
> your drug passed
> by the FDA- you want to make sure each step of the
> data process makes
> clinical sense, matches the source documentation,
> and gives you
> sensical statistics for the most part.
>
> Amy
>
>
> --- In Statisticians_group@...,
> KAUSHIK BHATTACHARJEE
> <kabonline07@...> wrote:
> >
> > Dear All,
> > I am perhaps really naive..but what does realy
> "Data Validation"
> means?
> > Is it scrutiny of the data? Or plotting the data
> & checking for
> outlier?
> > In Finance & Economics generally most of the
> data are on ratio
> scale (not obtained by desiging a questionnaire for
> measuring
> qualitative variables & applying iton the sample of
> objects) &
> publicly available or obtained from specilist
> sources for a fee...so
> perhaps no one speaks about"Data Validation" in
> finance litarature,:
> Or it is so basic & implied so that no one even
> talks about it....
> > Anyway, I would also like to hear from
> statisticians...
> > Regds.
> > Kaushik
> >
> >
> >
> >
> >
> > moccalatte2003 <amoore@...> wrote:
> > Hello Everyone,
> >
> > Happy New Year! I had a question for the group.
> How many of you
> > actually validate the data you use for your model
> before you start
> > analysis? I think data validation is an important
> step and affect
> the
> > results greatly. What does everyone think?
> >
> > Regards,
> > Amy
> >
> >
> >
> >
> >
> >
> > ---------------------------------
> > Never miss a thing. Make Yahoo your homepage.
> >
>
>
>




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