octave:78> samples samples = Columns 1 through 53: 0 0 0 0 0 0 0 0 0 0 0 0 6 6 6 6 6 6 6 0 0 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 0 0 0 0 0 0 Columns 54 through 106: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Columns 107 through 159: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Columns 160 and 161: 0 0 octave:79> grps grps = Columns 1 through 53: 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 Columns 54 through 106: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Columns 107 through 159: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Columns 160 and 161: 1 1 octave:80> anova(samples,grps) One-way ANOVA Table: Source of Variation Sum of Squares df Empirical Var ********************************************************* Between Groups 944.4969 1 944.4969 Within Groups -0.0000 159 -0.0000 --------------------------------------------------------- Total 944.4969 160 Test Statistic f -94353808874586048.0000 p-value 1.0000 ans = 1