Without delving into the computational details, it seems to me that they are
both close enough that it doesn't seem to matter. It may be that *both* are
right, but just use slightly different algorithms. The differences don't
show up until about the 5th or 6th decimal place - that looks like roundoff
differences to me. Have you tried asking SYSTAT to report the answers to
higher precision? One may be giving you the answer in single precision, the
other in double precision.
What versions of each program are you using?
<[EMAIL PROTECTED]> wrote in message 893959$k3n$[EMAIL PROTECTED]">news:893959$k3n$[EMAIL PROTECTED]...
> I have found a difference between the results produced by SPSS and
> SYSTAT in linear regression with no constant term. Below are the
> results from the programs. As you can see the adjusted R2 given by the
> 2 programs is different. Which one is correct?
>
> Data (from NIST line origin dataset):
> Y X
> 130 60
> 131 61
> 132 62
> 133 63
> 134 64
> 135 65
> 136 66
> 137 67
> 138 68
> 139 69
> 140 70
>
> Linear regression Y on X with no constant term.
>
> SYSTAT:
> R2 = 0.999365492
> adj R2 = 0.999365492
>
> SPSS:
> R2 = 0.9993654922987
> adj R2 = 0.9993020415285
>
> I would appreciate some help.
>
> Many thanks,
> Dr L Green.
>
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
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