For the first example, it looks like pspp and spss are computing the same basic statistics. The most important values in the output are those in the ANOVA table, the coefficients and their standard errors. All these agree with the values shown in the example. That said, there are some discrepancies which need further attention:
1. The "standard error of the estimate" in the model summary table. On the page whose link you sent, this value is about 64, but pspp reports a value of about .08. I'll have to check this one later, but for now, I suspect it's the web page that has the incorrect value. If I remember correctly, the value should be the standard error of R-square. R-square is always between 0 and 1, and therefore should not have a standard error larger than 1, as the web page reports. 2. The "Coefficients" table, in the column referring to the standardized coefficients. This is something I'll have to check more closely later, but pspp seems to report the incorrect values here. 3. The discrepancy in the "Sig." column needs to be checked. I'm guessing it's something simple, like a miscalculation of degrees of freedom. This column is filled in by a straightforward computation of the t distribution. I'll look into this more over the next few days and patch as necessary. -Jason On Sat, Feb 03, 2007 at 08:25:06AM +0900, John Darrington wrote: > When I try out the exercises at > http://www.ats.ucla.edu/stat/SPSS/webbooks/reg/chapter1/spssreg1.htm > using pspp, the numbers I get are quite different to those in their > examples. > > Do we have something wrong or do they? > > J' > > -- > PGP Public key ID: 1024D/2DE827B3 > fingerprint = 8797 A26D 0854 2EAB 0285 A290 8A67 719C 2DE8 27B3 > See http://pgp.mit.edu or any PGP keyserver for public key. > > > _______________________________________________ > pspp-dev mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/pspp-dev _______________________________________________ pspp-dev mailing list [email protected] http://lists.gnu.org/mailman/listinfo/pspp-dev
