單項(xiàng)選擇題下列哪個(gè)proc步完全正確?()

A.
B.
C.
D.


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1.單項(xiàng)選擇題變量Address2包含諸如Piscataway,NJ之類的值。如何將兩個(gè)字母的州縮寫分配給名為State的新變量?()

A.State=scan(address2,2);
B.State=scan(address2,13,2);
C.State=substr(address2,2);
D.State=substr(address2,13,2);

2.單項(xiàng)選擇題下列哪項(xiàng)時(shí)對(duì)Var1,Var2,Var3,Var4求均值?()

A.mean(var1,var4)
B.mean(var1-var4)
C.mean(of var1,var4)
D.mean(of var1-var4)

3.單項(xiàng)選擇題

哪個(gè)SAS程序讀取ID的值并保存每個(gè)Quantity值的記錄,以便為每個(gè)記錄創(chuàng)建三個(gè)觀察值?()

A.data work.sales;infile unitsold;input ID $;do week=1to 3;input Quantity :comma.;output;end;run;
B.data work.sales;infile unitsold;input ID $@@;do week=1to 3;input Quantity :comma.;output;end;run;
C.data work.sales;infile unitsold;input ID $@;do week=1to 3;input Quantity :comma.;output;end;run;
D.data work.sales;infile unitsold;input ID $@;do week=1to 3;input Quantity :comma.@;output;end;run;

4.單項(xiàng)選擇題哪個(gè)指針控件用于按順序讀取多個(gè)記錄?()

A.@n
B.+n
C./
D.all of the above