On Tue, Jul 26, 2011 at 10:33:56AM +0000, John Darrington wrote: > See the attached tar file. > expected.txt is what spss gives (apparently) > pspp.txt is what pspp gives. > fdequal.sps is the syntax, which has a test both with and without interaction. > > I hope the problem is clear from this.
I looked into this problem. Briefly stated, this happens because the meaning of "type 3 sums of squares" changes in the presence of interactions. The fix should be simple enough, but requires get_ssq to know which variables, if any, went into an interaction. Is there an easy way to do this? -Jason > > J' > > On Mon, Jul 25, 2011 at 02:29:07PM -0400, Jason Stover wrote: > On Mon, Jul 25, 2011 at 09:11:21AM +0000, John Darrington wrote: > > The sum of squares for factors with interactions are correct, and all > the degrees of > > freedome are correct. Unfortunately the ssq for factors without > interactions are > > wrong (my experiments showed 3.0 and 3.5 times too high) if the > analysis also > > includes interactions between those factors. > > > > However, if the analysis is run on the individual variables, without > the interactions, > > then the results are correct. > > > > So I think the get_ssq function needs some more work. > > Can you send syntax and output that shows the problems? > > -- > 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] https://lists.gnu.org/mailman/listinfo/pspp-dev
