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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. 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)

  3. 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...