你打開你的lab4看看,group是空的。需要在group后加一個 $, 像這樣 input score group $;
跑出來是這樣的:
Levene's Test for Homogeneity of score Variance
ANOVA of Squared Deviations from Group Means
Source DF Sum of Squares Mean Square F Value Pr > F
group 3 255836 85278.8 2.53 0.0778
Error 28 945397 33764.2