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Re: st: Reliability (Spearman/Brown)


From   ParzerPeter <peter.parzer@med.uni-heidelberg.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Reliability (Spearman/Brown)
Date   Mon, 5 Mar 2007 08:56:42 +0100

Hi,

I think "spearman" is the right command:

. spearman x y

 Number of obs =     100
Spearman's rho =       0.6155

Test of Ho: x and y are independent
    Prob > |t| =       0.0000

You get the correlation coefficient with r(rho) if you want to process it 
further.

. ret list

scalars:
                 r(N) =  100
               r(rho) =  .6154575457545756
                 r(p) =  9.50421231184e-12


Peter

Am Sonntag, 4. März 2007 12:03 schrieb Vanessa Mahlberg:
> Hallo,
>
> I?ve got a (maybe very simple) question:
>
> I would like to calculate the split-half reliability (Spearman/Brown)
> for a whole scala (including 14 items).If I use the spearman?s rank
> correlation I always get a kind of intercorrelation matrix...but I just
> want to have a single value that the Spearman Brown reliability for my
> whole is e.g. .95. (I want to compare this value with the one given by
> theoretical litterature).
>
> It would be very kind if somebody could give me some advice concerning
> the right stata command.
>
> Thanks and a nice weekend
> Vanessa
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-- 
Peter Parzer
Universitätsklinikum Heidelberg
Zentrum für Psychosoziale Medizin
Klinik für Kinder- und Jugendpsychiatrie
Blumenstraße 8, D-69115 Heidelberg
Tel. +49-6221-566938, Fax. +49-6221-566941

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