Analysis of varince showed differences but in post hoc tests there was no difference highlighted. What could have happened? Can anyone help me?
Which post hoc test did you use? Some are more conservative than others. Fisher LSD should find at least one significant difference if the overall ANOVA test is significant, but say Bonferroni might not.
Check, whether ANOVA's assumptions are fulfilledd (Levene's Test). Try my "MultiANOVA" macro (http://main3.amu.edu.pl/~apl/index.html).