關(guān)于sas base 70題目討論

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1.Consider the following data step:

data WORK.NEW;

set WORK.OLD;

Count+1;

run;

The variable Count is created using a sum statement. Whichstatement regarding this variable is true?

A.It is assigned a value 0 when the data step begins execution.

B.It is assigned a value of missing when the data step begins execution.

C.It is assigned a value 0 at compile time.

D.It is assigned a value of missing at compile time.

(我選C)

29.The following SAS program issumbitted:

data WORK.INFO;

     infile 'DATAFILE.TXT';

     input @1 Company 20.@25State2. @;

     if State=' ' then input @30 Year;

     else input @30 City Year;

     input NumEmployees;

run;

How many raw data records areread during each iteration of the DATA step?

     A. 1

     B. 2

     C. 3

     D. 4

我選B

第一題 Count+1; 等價于 retain count 0，count+1；所以一開始count=0 所以選C
第二題由于input @1 Company 20.@25State2. @;
if State=' ' then input @30 Year;
else input @30 City Year; 沒有@ 所以之后input讀新的一行 （但是此處疑惑的是不過對于if ...then; else...中也有兩個input statemens， 第一個被@ hold住了沒有跳行那么第二個也可以被hold住嗎,會不會選C?????）
歡迎大家討論

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關(guān)鍵詞：SAS base Base Data step EXECUTION following following regarding assigned created