The psychopathology of everyday art: a quantitative Study - World ...

fairly small, less than 0.1, indicating homogeneity within groups. There were no
consistent outliers which could be easily eliminated and at this early stage it was not clear
exactly what was important, so it would be unwise to change the data, and possibly the
assumptions, merely to decrease the noise in the data.
5 plots of group variances (plots 6a-m shown as the standard differences from
each group's mean, Appendix 2) showed a wider scatter of differences for diagnostic
group 4 (controls) generally, and five show a smaller scatter for group 2 (depressed). Six
plots showed concentrations of group 1 (schizophrenics) cases below the mean, but
generally the plots show a similar overall distribution for each of the five groups on every
variable. A certain amount of deviation does not compromise the ANOVA test, even in
unbalanced designs, providing group sizes result from chance fluctuation as fits the case
here.
The Main Analyses: comparison of Groups
Table 9 identifies 10 variables as significantly different, using the results of an ANOVA
performed among the 4 patient groups and the control group, pairwise comparisons are
indicated using the modified LSD procedure, which compensates for multiple tests. F-
values are shown in table 8.
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