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bug: p-value > 1.0 for paired t-test
From
:
William Simpson
Subject
:
bug: p-value > 1.0 for paired t-test
Date
:
Thu, 12 Nov 2009 15:54:36 +0000
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
dita_glm.sav
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bug: p-value > 1.0 for paired t-test
,
William Simpson
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bug: p-value > 1.0 for paired t-test
,
William Simpson
,
2009/11/12
Re: bug: p-value > 1.0 for paired t-test
,
John Darrington
,
2009/11/12
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Fwd: bug: p-value > 1.0 for paired t-test
,
William Simpson
,
2009/11/12
Re: bug: p-value > 1.0 for paired t-test
,
michel
,
2009/11/12
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