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  1. ...the covariance or correlation matrix analyzed must be positive definite, and maximum likelihood (ML) estimation will also perform poorly in such situations. If the...

  2. Too many ways can do that. The quickest way is using Chi-square test. data ovarian; input grp $1-7 age $9-12 count; label grp='Group' age='Age of menarche' count='Count'; cards; case LT11...

  3. PROC FREQ; TABLE x1*x2; RUN; x1 x2 表示你的表格上的兩個變項 可自行命名 若要做其他統計計算可在 X1*x2 之後打 / chisq 斜線之後可以加的東西很多請找SAS說明(程式上方圖形按鈕最右邊有個像書的選項)