Bias in Stats Packages ?
warrenk at cix.compulink.co.uk
Fri Mar 11 02:00:09 EST 1994
> > Systat's 1500.565. The resulting f-ratio was 364.1975 vs 364.300. I
> > think I would tend to believe Systat's results more :-)
> > Dr. Warren L. Kovach Internet: warrenk at cix.compulink.co.uk
> Good point, but why? Do they both give the method of calculation, and
> which method do you consider more accurate? I always have this same
> with letting a computer do my dirty work, but prefer to base my bias on
> knowledge of the methods used rather than familiarity with the program.
> If you can share information about the method of calculation and your
> reason for preference, that would be appreciated. Thanks.
> Leonard N. Bloksberg
> bloksber at pilot.msu.edu
The Systat manual states that the sums of squares are calculated in
double precision using Spicer's one-pass provisional algorithm. The
Excel manuel says exactly nothing about the methods of calculation. Like
you, I prefer the known to the unknown.
Dr. Warren L. Kovach Internet: warrenk at cix.compulink.co.uk
Kovach Computing Services CompuServe: 100016,2265
85 Nant-y-Felin tel./fax: +44-248-450414
Pentraeth, Anglesey, Wales LL75 8UY U.K.
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