Fixed a bug where contrasts with negative T where incorrectly processed.
[pspp] / tests / language / stats / oneway.at
index e3430ed9c8093992b9e349ff7cd8a10c87867120..03e8145d160ed55c721d85d7068a8dee9249a471 100644 (file)
@@ -4,19 +4,19 @@ AT_SETUP([ONEWAY basic operation])
 AT_DATA([oneway.sps],
   [DATA LIST NOTABLE LIST /QUALITY * BRAND * .
 BEGIN DATA
-3 1
-2 1
-1 1
-1 1
-4 1
-5 2
-2 2
-4 2
-2 2
-3 2
 7  3
 4  3
+3  1
+2  1
+1  1
+4  2
+2  2
+3  2
 5  3
+1  1
+4  1
+5  2
+2  2
 3  3
 6  3
 END DATA
@@ -44,11 +44,11 @@ Breaking Strain,Aspeger,5,2.20,1.30,.58,.58,3.82,1.00,4.00
 ,Total,15,3.47,1.77,.46,2.49,4.45,1.00,7.00
 
 Table: Test of Homogeneity of Variances
-,Levene Statistic,df1,df2,Significance
+,Levene Statistic,df1,df2,Sig.
 Breaking Strain,.09,2,12,.91
 
 Table: ANOVA
-,,Sum of Squares,df,Mean Square,F,Significance
+,,Sum of Squares,df,Mean Square,F,Sig.
 Breaking Strain,Between Groups,20.13,2,10.07,5.12,.02
 ,Within Groups,23.60,12,1.97,,
 ,Total,43.73,14,,,
@@ -117,11 +117,11 @@ Breaking Strain,Aspeger,5,2.20,1.30,.58,.58,3.82,1.00,4.00
 ,Total,7,2.57,1.51,.57,1.17,3.97,1.00,5.00
 
 Table: Test of Homogeneity of Variances
-,Levene Statistic,df1,df2,Significance
+,Levene Statistic,df1,df2,Sig.
 Breaking Strain,1.09,1,5,.35
 
 Table: ANOVA
-,,Sum of Squares,df,Mean Square,F,Significance
+,,Sum of Squares,df,Mean Square,F,Sig.
 Breaking Strain,Between Groups,2.41,1,2.41,1.07,.35
 ,Within Groups,11.30,5,2.26,,
 ,Total,13.71,6,,,
@@ -150,11 +150,11 @@ Breaking Strain,Bloggs,3,3.00,1.00,.58,.52,5.48,2.00,4.00
 ,Total,8,4.25,1.67,.59,2.85,5.65,2.00,7.00
 
 Table: Test of Homogeneity of Variances
-,Levene Statistic,df1,df2,Significance
+,Levene Statistic,df1,df2,Sig.
 Breaking Strain,.92,1,6,.37
 
 Table: ANOVA
-,,Sum of Squares,df,Mean Square,F,Significance
+,,Sum of Squares,df,Mean Square,F,Sig.
 Breaking Strain,Between Groups,7.50,1,7.50,3.75,.10
 ,Within Groups,12.00,6,2.00,,
 ,Total,19.50,7,,,
@@ -320,7 +320,7 @@ QUALITY,11.00,5,12.20,1.30,.58,10.58,13.82,11.00,14.00
 ,Total,15,13.47,1.77,.46,12.49,14.45,11.00,17.00
 
 Table: ANOVA
-,,Sum of Squares,df,Mean Square,F,Significance
+,,Sum of Squares,df,Mean Square,F,Sig.
 QUALITY,Between Groups,20.13,2,10.07,5.12,.02
 ,Within Groups,23.60,12,1.97,,
 ,Total,43.73,14,,,
@@ -361,14 +361,614 @@ ONEWAY
 
 AT_CHECK([pspp -O format=csv oneway-homogeneity.sps], [0], 
 [Table: Test of Homogeneity of Variances
-,Levene Statistic,df1,df2,Significance
+,Levene Statistic,df1,df2,Sig.
 QUALITY,.09,2,12,.91
 
 Table: ANOVA
-,,Sum of Squares,df,Mean Square,F,Significance
+,,Sum of Squares,df,Mean Square,F,Sig.
 QUALITY,Between Groups,20.13,2,10.07,5.12,.02
 ,Within Groups,23.60,12,1.97,,
 ,Total,43.73,14,,,
 ])
 
 AT_CLEANUP
+
+
+
+AT_SETUP([ONEWAY multiple variables])
+dnl check that everything works ok when several different dependent variables are specified.
+dnl This of course does not mean that we're doing a multivariate analysis.  It's just like
+dnl running several tests at once.
+AT_DATA([multivar.sps],
+[DATA LIST notable LIST /x * y * z * g *.
+begin data.
+1 1 0 10
+1 1 9 10
+9 1 2 10
+1 1 3 20
+1 1 8 20
+1 1 1 20
+1 1 2 20
+0 1 3 20
+1 1 4 30
+0 1 5 30
+1 1 6 30
+0 1 7 30
+1 2 8 30
+2 2 9 30
+1 2 1 30
+1 2 0 30
+1 2 2 40
+8 2 3 40
+1 2 4 40
+1 2 9 40
+9 2 8 40
+7 3 7 40
+2 3 6 40
+3 3 5 40
+end data.
+
+ONEWAY x y z by g
+       /STATISTICS = DESCRIPTIVES HOMOGENEITY
+       /CONTRAST 3  2 0 -5
+       /CONTRAST 2 -9 7  0
+       .
+])
+AT_CHECK([pspp -o pspp.csv multivar.sps])
+dnl Some machines return 3.88 instead of 3.87 below (see bug #31611).
+AT_CHECK([sed 's/^,Within Groups,3.88/,Within Groups,3.87/' pspp.csv], [0],
+[Table: Descriptives
+,,,,,,95% Confidence Interval for Mean,,,
+,,N,Mean,Std. Deviation,Std. Error,Lower Bound,Upper Bound,Minimum,Maximum
+x,10.00,3,3.67,4.62,2.67,-7.81,15.14,1.00,9.00
+,20.00,5,.80,.45,.20,.24,1.36,.00,1.00
+,30.00,8,.88,.64,.23,.34,1.41,.00,2.00
+,40.00,8,4.00,3.42,1.21,1.14,6.86,1.00,9.00
+,Total,24,2.25,2.83,.58,1.05,3.45,.00,9.00
+y,10.00,3,1.00,.00,.00,1.00,1.00,1.00,1.00
+,20.00,5,1.00,.00,.00,1.00,1.00,1.00,1.00
+,30.00,8,1.50,.53,.19,1.05,1.95,1.00,2.00
+,40.00,8,2.38,.52,.18,1.94,2.81,2.00,3.00
+,Total,24,1.63,.71,.15,1.32,1.93,1.00,3.00
+z,10.00,3,3.67,4.73,2.73,-8.07,15.41,.00,9.00
+,20.00,5,3.40,2.70,1.21,.05,6.75,1.00,8.00
+,30.00,8,5.00,3.21,1.13,2.32,7.68,.00,9.00
+,40.00,8,5.50,2.45,.87,3.45,7.55,2.00,9.00
+,Total,24,4.67,2.99,.61,3.40,5.93,.00,9.00
+
+Table: Test of Homogeneity of Variances
+,Levene Statistic,df1,df2,Sig.
+x,18.76,3,20,.00
+y,71.41,3,20,.00
+z,.89,3,20,.46
+
+Table: ANOVA
+,,Sum of Squares,df,Mean Square,F,Sig.
+x,Between Groups,56.16,3,18.72,2.92,.06
+,Within Groups,128.34,20,6.42,,
+,Total,184.50,23,,,
+y,Between Groups,7.75,3,2.58,13.33,.00
+,Within Groups,3.87,20,.19,,
+,Total,11.63,23,,,
+z,Between Groups,17.47,3,5.82,.62,.61
+,Within Groups,187.87,20,9.39,,
+,Total,205.33,23,,,
+
+Table: Contrast Coefficients
+,,g,,,
+,,10.00,20.00,30.00,40.00
+Contrast,1,3,2,0,-5
+,2,2,-9,7,0
+
+Table: Contrast Tests
+,,Contrast,Value of Contrast,Std. Error,t,df,Sig. (2-tailed)
+x,Assume equal variances,1,-7.40,6.67,1.11,20,.28
+,,2,6.26,12.32,.51,20,.62
+,Does not assume equal,1,-7.40,10.04,-.74,4.53,.50
+,,2,6.26,5.85,1.07,2.87,.37
+y,Assume equal variances,1,-6.88,1.16,5.94,20,.00
+,,2,3.50,2.14,1.63,20,.12
+,Does not assume equal,1,-6.88,.91,-7.51,7.00,.00
+,,2,3.50,1.32,2.65,7.00,.03
+z,Assume equal variances,1,-9.70,8.07,1.20,20,.24
+,,2,11.73,14.91,.79,20,.44
+,Does not assume equal,1,-9.70,9.57,-1.01,3.64,.37
+,,2,11.73,14.53,.81,9.88,.44
+])
+
+AT_CLEANUP
+
+
+
+dnl Tests that everything treats weights properly
+AT_SETUP([ONEWAY vs. weights])
+
+AT_DATA([oneway-unweighted.sps],
+[DATA LIST NOTABLE LIST /QUALITY * BRAND * W *.
+BEGIN DATA
+3  1   1
+2  1   1
+1  1   1
+1  1   1
+4  1   1
+5  2   1
+2  2   1
+4  2   1
+4  2   1
+4  2   1
+2  2   1
+2  2   1
+3  2   1
+7  3   1
+4  3   1
+5  3   1
+5  3   1
+3  3   1
+6  3   1
+END DATA.
+
+WEIGHT BY W.
+
+ONEWAY
+       quality BY brand
+       /STATISTICS descriptives homogeneity
+       .
+])
+
+AT_CHECK([pspp -o pspp-unweighted.csv oneway-unweighted.sps], [0], [ignore], [ignore])
+
+AT_DATA([oneway-weighted.sps],
+[DATA LIST NOTABLE LIST /QUALITY * BRAND * W *.
+BEGIN DATA
+3  1   1
+2  1   1
+1  1   2
+4  1   1
+5  2   1
+2  2   1
+4  2   3
+2  2   2
+3  2   1
+7  3   1
+4  3   1
+5  3   2
+3  3   1
+6  3   1
+END DATA.
+
+WEIGHT BY W.
+
+ONEWAY
+       quality BY brand
+       /STATISTICS descriptives homogeneity
+       .
+])
+
+AT_CHECK([pspp -o pspp-weighted.csv oneway-weighted.sps], [0], [ignore], [ignore])
+
+AT_CHECK([diff pspp-weighted.csv pspp-unweighted.csv], [0])
+
+AT_CLEANUP
+
+
+
+AT_SETUP([ONEWAY posthoc LSD and BONFERRONI])
+AT_DATA([oneway-pig.sps],[dnl
+SET FORMAT F12.3.
+data list notable list /pigmentation * family *.
+begin data.
+36 1
+39 1
+43 1
+38 1
+37 1
+46 2
+47 2
+47 2
+47 2
+43 2
+40 3
+50 3
+44 3
+48 3
+50 3
+45 4
+53 4
+56 4
+52 4
+56 4
+end data.
+
+
+oneway pigmentation by family
+       /statistics = descriptives
+       /posthoc = lsd bonferroni alpha (0.05)
+        .
+])
+
+AT_CHECK([pspp -O format=csv oneway-pig.sps], [0], 
+[Table: Descriptives
+,,,,,,95% Confidence Interval for Mean,,,
+,,N,Mean,Std. Deviation,Std. Error,Lower Bound,Upper Bound,Minimum,Maximum
+pigmentation,1.000,5,38.600,2.702,1.208,35.245,41.955,36.000,43.000
+,2.000,5,46.000,1.732,.775,43.849,48.151,43.000,47.000
+,3.000,5,46.400,4.336,1.939,41.016,51.784,40.000,50.000
+,4.000,5,52.400,4.506,2.015,46.806,57.994,45.000,56.000
+,Total,20,45.850,5.967,1.334,43.057,48.643,36.000,56.000
+
+Table: ANOVA
+,,Sum of Squares,df,Mean Square,F,Sig.
+pigmentation,Between Groups,478.950,3,159.650,12.927,.000
+,Within Groups,197.600,16,12.350,,
+,Total,676.550,19,,,
+
+Table: Multiple Comparisons (pigmentation)
+,,,Mean Difference,,,95% Confidence Interval,
+,(I) family,(J) family,(I - J),Std. Error,Sig.,Lower Bound,Upper Bound
+LSD,1.000,2.000,-7.400,2.223,.004,-12.112,-2.688
+,,3.000,-7.800,2.223,.003,-12.512,-3.088
+,,4.000,-13.800,2.223,.000,-18.512,-9.088
+,2.000,1.000,7.400,2.223,.004,2.688,12.112
+,,3.000,-.400,2.223,.859,-5.112,4.312
+,,4.000,-6.400,2.223,.011,-11.112,-1.688
+,3.000,1.000,7.800,2.223,.003,3.088,12.512
+,,2.000,.400,2.223,.859,-4.312,5.112
+,,4.000,-6.000,2.223,.016,-10.712,-1.288
+,4.000,1.000,13.800,2.223,.000,9.088,18.512
+,,2.000,6.400,2.223,.011,1.688,11.112
+,,3.000,6.000,2.223,.016,1.288,10.712
+Bonferroni,1.000,2.000,-7.400,2.223,.025,-14.086,-.714
+,,3.000,-7.800,2.223,.017,-14.486,-1.114
+,,4.000,-13.800,2.223,.000,-20.486,-7.114
+,2.000,1.000,7.400,2.223,.025,.714,14.086
+,,3.000,-.400,2.223,1.000,-7.086,6.286
+,,4.000,-6.400,2.223,.065,-13.086,.286
+,3.000,1.000,7.800,2.223,.017,1.114,14.486
+,,2.000,.400,2.223,1.000,-6.286,7.086
+,,4.000,-6.000,2.223,.095,-12.686,.686
+,4.000,1.000,13.800,2.223,.000,7.114,20.486
+,,2.000,6.400,2.223,.065,-.286,13.086
+,,3.000,6.000,2.223,.095,-.686,12.686
+])
+
+AT_CLEANUP
+
+
+AT_SETUP([ONEWAY posthoc Tukey HSD and Games-Howell])
+AT_DATA([oneway-tukey.sps],[dnl
+set format = f11.3.
+data list notable list /libido * dose *.
+begin data.
+3 0
+2 0
+1 0
+1 0
+4 0
+5 1
+2 1
+4 1
+2 1
+3 1
+7 2
+4 2
+5 2
+3 2
+6 2
+end data.
+
+variable label dose 'Dose of Viagra'.
+
+add value labels dose 0 'Placebo' 1 '1 Dose' 2 '2 Doses'.
+
+oneway libido by dose
+       /posthoc tukey gh.
+])
+
+AT_CHECK([pspp -O format=csv oneway-tukey.sps], [0], 
+[Table: ANOVA
+,,Sum of Squares,df,Mean Square,F,Sig.
+libido,Between Groups,20.133,2,10.067,5.119,.025
+,Within Groups,23.600,12,1.967,,
+,Total,43.733,14,,,
+
+Table: Multiple Comparisons (libido)
+,,,Mean Difference,,,95% Confidence Interval,
+,(I) Dose of Viagra,(J) Dose of Viagra,(I - J),Std. Error,Sig.,Lower Bound,Upper Bound
+Tukey HSD,Placebo,1 Dose,-1.000,.887,.516,-3.366,1.366
+,,2 Doses,-2.800,.887,.021,-5.166,-.434
+,1 Dose,Placebo,1.000,.887,.516,-1.366,3.366
+,,2 Doses,-1.800,.887,.147,-4.166,.566
+,2 Doses,Placebo,2.800,.887,.021,.434,5.166
+,,1 Dose,1.800,.887,.147,-.566,4.166
+Games-Howell,Placebo,1 Dose,-1.000,.887,.479,-3.356,1.356
+,,2 Doses,-2.800,.887,.039,-5.439,-.161
+,1 Dose,Placebo,1.000,.887,.479,-1.356,3.356
+,,2 Doses,-1.800,.887,.185,-4.439,.839
+,2 Doses,Placebo,2.800,.887,.039,.161,5.439
+,,1 Dose,1.800,.887,.185,-.839,4.439
+])
+
+AT_CLEANUP
+
+AT_SETUP([ONEWAY posthoc Sidak])
+AT_DATA([oneway-sidak.sps],[dnl
+SET FORMAT F20.4.
+
+DATA LIST notable LIST /program score.
+BEGIN DATA.
+1   9
+1  12
+1  14
+1  11
+1  13
+2  10
+2   6
+2   9
+2   9
+2  10
+3  12
+3  14
+3  11
+3  13
+3  11
+4   9
+4   8
+4  11
+4   7
+4   8
+END DATA.
+
+ONEWAY
+  score BY program
+  /MISSING ANALYSIS
+  /POSTHOC = SIDAK.
+])
+
+AT_CHECK([pspp -O format=csv oneway-sidak.sps], [0], 
+[Table: ANOVA
+,,Sum of Squares,df,Mean Square,F,Sig.
+score,Between Groups,54.9500,3,18.3167,7.0449,.0031
+,Within Groups,41.6000,16,2.6000,,
+,Total,96.5500,19,,,
+
+Table: Multiple Comparisons (score)
+,,,Mean Difference,,,95% Confidence Interval,
+,(I) program,(J) program,(I - J),Std. Error,Sig.,Lower Bound,Upper Bound
+Šidák,1.0000,2.0000,3.0000,1.0198,.0561,-.0575,6.0575
+,,3.0000,-.4000,1.0198,.9993,-3.4575,2.6575
+,,4.0000,3.2000,1.0198,.0375,.1425,6.2575
+,2.0000,1.0000,-3.0000,1.0198,.0561,-6.0575,.0575
+,,3.0000,-3.4000,1.0198,.0250,-6.4575,-.3425
+,,4.0000,.2000,1.0198,1.0000,-2.8575,3.2575
+,3.0000,1.0000,.4000,1.0198,.9993,-2.6575,3.4575
+,,2.0000,3.4000,1.0198,.0250,.3425,6.4575
+,,4.0000,3.6000,1.0198,.0166,.5425,6.6575
+,4.0000,1.0000,-3.2000,1.0198,.0375,-6.2575,-.1425
+,,2.0000,-.2000,1.0198,1.0000,-3.2575,2.8575
+,,3.0000,-3.6000,1.0198,.0166,-6.6575,-.5425
+])
+
+AT_CLEANUP
+
+AT_SETUP([ONEWAY posthoc Scheffe])
+AT_DATA([oneway-scheffe.sps],[dnl
+set format = f11.3.
+data list notable list /usage * group *.
+begin data.
+21.00     1
+19.00     1
+18.00     1
+25.00     1
+14.00     1
+13.00     1
+24.00     1
+19.00     1
+20.00     1
+21.00     1
+15.00     2
+10.00     2
+13.00     2
+16.00     2
+14.00     2
+24.00     2
+16.00     2
+14.00     2
+18.00     2
+16.00     2
+10.00     3
+ 7.00     3
+13.00     3
+20.00     3
+  .00     3
+ 8.00     3
+ 6.00     3
+ 1.00     3
+12.00     3
+14.00     3
+18.00     4
+15.00     4
+ 3.00     4
+27.00     4
+ 6.00     4
+14.00     4
+13.00     4
+11.00     4
+ 9.00     4
+18.00     4
+end data.
+
+variable label usage 'Days of Use'.
+
+add value labels group 0 'none' 1 'one' 2 'two' 3 'three' 4 'four'.
+
+oneway usage by group
+       /posthoc scheffe.
+])
+
+AT_CHECK([pspp -O format=csv oneway-scheffe.sps], [0], 
+[Table: ANOVA
+,,Sum of Squares,df,Mean Square,F,Sig.
+Days of Use,Between Groups,555.275,3,185.092,6.663,.001
+,Within Groups,1000.100,36,27.781,,
+,Total,1555.375,39,,,
+
+Table: Multiple Comparisons (Days of Use)
+,,,Mean Difference,,,95% Confidence Interval,
+,(I) group,(J) group,(I - J),Std. Error,Sig.,Lower Bound,Upper Bound
+Scheffé,one,two,3.800,2.357,.467,-3.112,10.712
+,,three,10.300,2.357,.001,3.388,17.212
+,,four,6.000,2.357,.110,-.912,12.912
+,two,one,-3.800,2.357,.467,-10.712,3.112
+,,three,6.500,2.357,.072,-.412,13.412
+,,four,2.200,2.357,.832,-4.712,9.112
+,three,one,-10.300,2.357,.001,-17.212,-3.388
+,,two,-6.500,2.357,.072,-13.412,.412
+,,four,-4.300,2.357,.358,-11.212,2.612
+,four,one,-6.000,2.357,.110,-12.912,.912
+,,two,-2.200,2.357,.832,-9.112,4.712
+,,three,4.300,2.357,.358,-2.612,11.212
+])
+
+AT_CLEANUP
+
+
+AT_SETUP([ONEWAY bad contrast count])
+
+AT_DATA([oneway-bad-contrast.sps],[dnl
+DATA LIST NOTABLE LIST /height * weight * temperature * sex *.
+BEGIN DATA.
+1884     88.6       39.97     0
+1801     90.9       39.03     0
+1801     91.7       38.98     0
+1607     56.3       36.26     1
+1608     46.3       46.26     1
+1607     55.9       37.84     1
+1604     56.6       36.81     1
+1606     56.1       34.56     1
+END DATA.
+
+ONEWAY /VARIABLES= height weight temperature BY sex
+ /CONTRAST = -1  1 
+ /CONTRAST = -3  3 
+ /CONTRAST =  2 -2  1
+ /CONTRAST = -9  9
+ . 
+])
+
+
+AT_CHECK([pspp -O format=csv oneway-bad-contrast.sps], [0], [dnl
+"oneway-bad-contrast.sps:18: warning: ONEWAY: In contrast list 3, the number of coefficients (3) does not equal the number of groups (2). This contrast list will be ignored."
+
+Table: ANOVA
+,,Sum of Squares,df,Mean Square,F,Sig.
+height,Between Groups,92629.63,1,92629.63,120.77,.00
+,Within Groups,4601.87,6,766.98,,
+,Total,97231.50,7,,,
+weight,Between Groups,2451.65,1,2451.65,174.59,.00
+,Within Groups,84.25,6,14.04,,
+,Total,2535.90,7,,,
+temperature,Between Groups,1.80,1,1.80,.13,.73
+,Within Groups,84.55,6,14.09,,
+,Total,86.36,7,,,
+
+Table: Contrast Coefficients
+,,sex,
+,,.00,1.00
+Contrast,1,-1,1
+,2,-3,3
+,3,-9,9
+
+Table: Contrast Tests
+,,Contrast,Value of Contrast,Std. Error,t,df,Sig. (2-tailed)
+height,Assume equal variances,1,-222.27,20.23,10.99,6,.00
+,,2,-666.80,60.68,10.99,6,.00
+,,3,-2000.40,182.03,10.99,6,.00
+,Does not assume equal,1,-222.27,27.67,-8.03,2.00,.02
+,,2,-666.80,83.02,-8.03,2.00,.02
+,,3,-2000.40,249.07,-8.03,2.00,.02
+weight,Assume equal variances,1,-36.16,2.74,13.21,6,.00
+,,2,-108.48,8.21,13.21,6,.00
+,,3,-325.44,24.63,13.21,6,.00
+,Does not assume equal,1,-36.16,2.19,-16.48,5.42,.00
+,,2,-108.48,6.58,-16.48,5.42,.00
+,,3,-325.44,19.75,-16.48,5.42,.00
+temperature,Assume equal variances,1,-.98,2.74,.36,6,.73
+,,2,-2.94,8.22,.36,6,.73
+,,3,-8.83,24.67,.36,6,.73
+,Does not assume equal,1,-.98,2.07,-.47,4.19,.66
+,,2,-2.94,6.22,-.47,4.19,.66
+,,3,-8.83,18.66,-.47,4.19,.66
+])
+
+AT_CLEANUP
+
+
+AT_SETUP([ONEWAY crash on single category independent variable])
+AT_DATA([crash.sps],[
+input program.
+loop #i = 1 to 10.
+compute test = #i.
+end case.
+end loop.
+end file.
+end input program.
+
+compute x = 1.
+
+oneway test by x.
+])
+
+AT_CHECK([pspp -O format=csv crash.sps], [0], [ignore])
+
+AT_CLEANUP
+
+
+
+AT_SETUP([ONEWAY crash on missing dependent variable])
+AT_DATA([crash2.sps],[dnl
+data list notable list /dv1 * dv2  *  y * .
+begin data.
+2  .  2     
+1  .  2 
+1  .  1    
+2  .  4    
+3  .  4
+4  .  4    
+5  .  4    
+end data.
+
+ONEWAY 
+       /VARIABLES= dv1 dv2  BY y
+       /STATISTICS = DESCRIPTIVES
+       /POSTHOC = BONFERRONI LSD SCHEFFE SIDAK TUKEY
+       /MISSING = ANALYSIS      
+       .
+])
+
+AT_CHECK([pspp -O format=csv crash2.sps], [0], [ignore])
+
+AT_CLEANUP
+
+
+
+
+AT_SETUP([ONEWAY Games-Howell test with few cases])
+AT_DATA([crash3.sps],[dnl
+data list notable list /dv * y * .
+begin data.
+2 2
+1 2
+1 1
+2 4
+3 4
+end data.
+
+ONEWAY
+ /VARIABLES= dv BY y
+ /POSTHOC = GH
+ . 
+])
+
+AT_CHECK([pspp -O format=csv crash3.sps], [0], [ignore])
+
+AT_CLEANUP