Homework Answers
Answer: Option e, Both A or B.
A) In DATA step one can use DROP(Syntax: DROP=Variable-1 <...Variable-n>) data set option with input and output data sets. If it is used with input data set the corresponding variables specified with DROP are not available for processing in DATA step. If it is used with output data set, corresponding variables specified with DROP are not written to the output data set by SAS.
B) Similar to DROP, KEEP(Synatax: KEEP=Variable-1 <...Variable-n>) can also be used with both input and output data sets. If KEEP is associated with input, then the variables specified by KEEP are only available for processing. If KEEP is associated with ouput data set then the variables specified by KEEP are written as ouput data set but all the variables are available for processing.
C) RETAIN statement is used to retain values of variables (created using INPUT and assignment statements) in the previous iteration to the current/present iteration of DATA.
D) VAR is used to specify the analysis variables and also to specify their order in output.
So Both A or B can be used to limit the variables written to output dataset in DATA STEP.
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SAS BASE PROGRAMMING M?C Q PLS HELLP!
The RETAIN statement can be used to Select one: a. Keep the values of only assigned variables from one iteration of the PROC PRINT step to the next b. Keep the values of all types of variables from one iteration of the DATA step to the next c. Keep the values of only assigned variables from one iteration of the DATA step to the next d. None of the other choices How many...
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Let L = {w! w can be written as cd#e#c with c, d, e e {a,b}* }. Show that is not regular.
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4. (10) Let L = {w w can be written as cd#e#c with c, d, e e {a, b}* }. Show that L is not regular.
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