---------- Forwarded message ---------- From: William Simpson <william.a.simp...@gmail.com> Date: Thu, Nov 12, 2009 at 6:16 PM Subject: Re: bug: p-value > 1.0 for paired t-test To: John Darrington <j...@cellform.com>
Thanks very much John! I grabbed the binary from http://www.cecaps.ufmg.br/pspp/?page_id=128&lang=en which, so far as I know, is the place that the PSPP home page directs people to when they want to download a windows binary. So, maintainer over at cecaps, if you're out there, please fix! Thanks! Cheers Bill On Thu, Nov 12, 2009 at 6:05 PM, John Darrington <j...@cellform.com> wrote: > This bug was fixed some time ago. See > http://savannah.gnu.org/bugs/index.php?26936 > > Obviously it didn't make it into the copy that you have. > > You can work around it by reversing the order of the pair. > > J' > > On Thu, Nov 12, 2009 at 03:54:36PM +0000, William Simpson wrote: > Windows version 0.7.2 > Data file attached > > paired t-test results (see tail end for screwy p-value > 1.0): > > 1.1 T-TEST. Paired Sample Statistics > #==========#======#==#==============#========# > # # Mean | N|Std. Deviation|SE. Mean# > #==========#======#==#==============#========# > #Pair 0 dc #365.84|18| 69.31| 16.34# > # dnc#366.52|18| 77.33| 18.23# > #Pair 1 pc #372.82|18| 66.64| 15.71# > # pnc#362.14|18| 65.03| 15.33# > #==========#======#==#==============#========# > > 1.2(2) T-TEST. Paired Samples Correlations > #======#========#==#===========#====# > # | # N|Correlation|Sig.# > #======#========#==#===========#====# > #Pair 0|dc & dnc#18| .98| .00# > #Pair 1|pc & pnc#18| .98| .00# > #======#========#==#===========#====# > > 1.3(1:2) T-TEST. Paired Samples Test > #==============#==========================================# > # # Paired Differences # > # #-----+--------------+---------------+-----# > # # | | | 95% # > # # | | +-----# > # # Mean|Std. Deviation|Std. Error Mean|Lower# > #==============#=====#==============#===============#=====# > #Pair 0dc - dnc# -.68| 18.06| 4.26|-9.66# > #Pair 1pc - pnc#10.68| 13.29| 3.13| 4.07# > #==============#=====#==============#===============#=====# > > 1.3(2:2) T-TEST. Paired Samples Test > #=====#====#==#===============# > # | | | # > #-----+ | | # > # | | | # > #-----+ | | # > #Upper| t |df|Sig. (2-tailed)# > #=====#====#==#===============# > # 8.30|-.16|17| .87# > #17.29|3.41|17| 2.00# > #=====#====#==#===============# > > 2.1 T-TEST. Paired Sample Statistics > #==========#======#==#==============#========# > # # Mean | N|Std. Deviation|SE. Mean# > #==========#======#==#==============#========# > #Pair 0 dc #370.20|17| 68.85| 16.70# > # dnc#372.61|17| 75.13| 18.22# > #Pair 1 pc #376.36|17| 66.92| 16.23# > # pnc#365.79|17| 65.10| 15.79# > #==========#======#==#==============#========# > > 2.2 T-TEST. Paired Samples Correlations > #======#========#==#===========#====# > # | # N|Correlation|Sig.# > #======#========#==#===========#====# > #Pair 0|dc & dnc#17| .98| .00# > #Pair 1|pc & pnc#17| .98| .00# > #======#========#==#===========#====# > > 2.3(1) T-TEST. Paired Samples Test > > #==============#=================================================#====#==# > # # Paired Differences | | > # > # #-----+--------------+---------------+------------+ | > # > # # | | | 95% | | > # > # # | | +------+-----+ | > # > # # Mean|Std. Deviation|Std. Error Mean| Lower|Upper| t > |df# > > #==============#=====#==============#===============#======#=====#====#==# > #Pair 0dc - dnc#-2.41| 17.01| 4.12|-11.16| > 6.33|-.59|16# > #Pair 1pc - pnc#10.57| 13.69| 3.32| > 3.53|17.61|3.18|16# > > #==============#=====#==============#===============#======#=====#====#==# > > 2.3(2:2) T-TEST. Paired Samples Test > #===============# > # # > # # > # # > # # > #Sig. (2-tailed)# > #===============# > # .57# > # 1.99# > #===============# > > 3.1 T-TEST. Paired Sample Statistics > #==========#======#==#==============#========# > # # Mean | N|Std. Deviation|SE. Mean# > #==========#======#==#==============#========# > #Pair 0 dc #370.20|17| 68.85| 16.70# > # dnc#372.61|17| 75.13| 18.22# > #Pair 1 pc #376.36|17| 66.92| 16.23# > # pnc#365.79|17| 65.10| 15.79# > #==========#======#==#==============#========# > > 3.2 T-TEST. Paired Samples Correlations > #======#========#==#===========#====# > # | # N|Correlation|Sig.# > #======#========#==#===========#====# > #Pair 0|dc & dnc#17| .98| .00# > #Pair 1|pc & pnc#17| .98| .00# > #======#========#==#===========#====# > > 3.3(1) T-TEST. Paired Samples Test > > #==============#=================================================#====#==# > # # Paired Differences | | > # > # #-----+--------------+---------------+------------+ | > # > # # | | | 95% | | > # > # # | | +------+-----+ | > # > # # Mean|Std. Deviation|Std. Error Mean| Lower|Upper| t > |df# > > #==============#=====#==============#===============#======#=====#====#==# > #Pair 0dc - dnc#-2.41| 17.01| 4.12|-11.16| > 6.33|-.59|16# > #Pair 1pc - pnc#10.57| 13.69| 3.32| > 3.53|17.61|3.18|16# > > #==============#=====#==============#===============#======#=====#====#==# > > 3.3(2:2) T-TEST. Paired Samples Test > #===============# > # # > # # > # # > # # > #Sig. (2-tailed)# > #===============# > # .57# > # 1.99#******************** p-value > 1.0!! SPSS gives 0.006 > #===============# > > > Please let me know what's going on here. Is it just a numerical problem > with > very small p-values?? > > Cheers > Bill > > > _______________________________________________ > Pspp-users mailing list > Pspp-users@gnu.org > http://lists.gnu.org/mailman/listinfo/pspp-users > > > -- > 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. > > > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > > iD8DBQFK/E5ximdxnC3oJ7MRAqA+AJ9PiutmymoXhtPdFOgmXAi8Jj5zWACfbx9u > Mu10EUp0vHOs2VqvqcYSrFA= > =uPtN > -----END PGP SIGNATURE----- > >
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