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RE: st: RE: estimate 95%CIs of the mean for different sample sizes


From   Miranda Kim <mirandakim@hotmail.co.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: estimate 95%CIs of the mean for different sample sizes
Date   Thu, 10 Jun 2010 12:23:25 +0100

Thanks for this Nick, very helpful.
Best wishes,
Miranda

----------------------------------------
> Subject: RE: st: RE: estimate 95%CIs of the mean for different sample sizes
> Date: Thu, 10 Jun 2010 11:39:58 +0100
> From: n.j.cox@durham.ac.uk
> To: statalist@hsphsun2.harvard.edu
>
> If you bootstrap you have to invent extra methodology for contracting or
> expanding to different sample sizes other than that in hand. The results
> you get then conflate side-effects or variability associated with that
> methodology with those of bootstrapping. That doesn't sound crazy, but
> it sounds like an elaborate exercise for what seems like a fairly simple
> question. Also, I think you would have to explain in a bit of detail
> what you're doing. All sounds a bit over the top to me, but it's your
> problem.
>
> With -cii- you could say I have this mean and standard deviation; what's
> the effect of changing the sample size? In fact, you don't need -cii- to
> do that, as it's an elementary calculation; but if a calculator would
> serve in place of -cii-, then so also -cii- would serve in place of a
> calculator.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Miranda Kim
>
> I had in mind something like bootstrap originally, but am not sure what
> method is most appropriate in this case. The purpose is to see what
> precision is obtained for different sample sizes.
>
> Nick Cox
>
>> -cii-
>
> Miranda Kim
>
>> I have data for a sample of 300 which is approximately normally
>> distributed (slightly skewed). I would like to derive 95% confidence
>> intervals around the estimate of the mean for sample sizes of 50, 80,
>> 100, 150, and 400.
>> Does anyone have any suggestions what command I can use to do this?
>
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