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Re: st: Re: Confidence Interval vs Confidence in Judgement


From   "Victor M. Zammit" <vmz@vol.net.mt>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Re: Confidence Interval vs Confidence in Judgement
Date   Fri, 10 Oct 2008 23:13:19 +0200

The statement that I use to compute my confidence interval is the usual
ttest, ie the difference between the mean of the random sample and the mean
of the population, multiplied by the square root of the sample size and the
product is divided by the standard deviation of the random sample.Because
the result is normalised,you could infer from it the confidence interval,for
the particular degree of freedom.
The problem that I am having is that the smaller the t-value,the smaller is
the confidence interval,but the higher is the confidence in your judgement
call (claim),which seems to be counter-intuitive for me.
Victor M. Zammit



-- Original Message ----- 
From: "Steven Samuels" <sjhsamuels@earthlink.net>
To: <statalist@hsphsun2.harvard.edu>
Sent: Friday, October 10, 2008 6:20 PM
Subject: Re: st: Re: Confidence Interval vs Confidence in Judgement


> Victor, show us the statements that you are using to compute your
> confidence interval.
>
> -Steve
> On Oct 10, 2008, at 12:11 PM, Victor M. Zammit wrote:
>
> > Dear Stata users,
> > I am reproducing a t-table,for degrees of freedom, from 1 to 30,and
> > after
> > taking 40,000 random samples  of obs.,from  2 to 31,each time from an
> > infinite normally distributed population ,and repeated the whole
> > process for
> > 10 times,my ttable has converged pretty much to that of Fisher and
> > Yates.
> > The program is very simple and I would be very glad to reproduce it
> > to any
> > one interested.
> > But having established the various confidence intervals associated
> > with the
> > t-values for the degrees of freedom indicates above,I am finding it
> > counter-intuitive, that the closer the t-value is to 0,and hence
> > the closer
> > you are to being correct in your judgement,the smaller the resulting
> > confidence interval.Obviously,I am confusing high confidence with wide
> > confidence interval.
> > I would like to know of other terminology that would make the
> > concept less
> > counter-intuitive.
> > I thank you in advance,
> > Victor M. Zammit
> >
> > *
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>
> *
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>

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