Question has been changed after some complains about it not being correct. Underscore represent blank space, I had to add them because blogger editor use to remove two or more spaces to one (Hint: missing informat for price).
The contents of the raw data file PRODUCT are listed below:
--------10-------20-------30
24613____$25.31
The following SAS program is submitted:
data inventory;
infile 'product';
input idnum 5. @10 price;
run;
Which one of the following is the value of the PRICE variable?
A. 25.31
B. $25.31
C. . (missing numeric value)
D. No value is stored as the program fails to execute due to errors.
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C
ReplyDeleteHere Answer is .31 Since we will read from position 10.
ReplyDeleteAll four options given here are invalid.
Agreed. It should be 0.31
ReplyDeleteC
ReplyDeleteD. No value is stored. The input file is not found.
ReplyDeleteunless... the file is stored in the directory that happens to be your current working directory, (has lowercase filename on case-dependent platforms) and has no file extension, then the value is 0.31 as the input buffer starts reading at the 10th column and continues until it reaches the space or eol/eof marker.
I'd be pretty annoyed if this were in a test I was sitting - I think the quotes marks are accidental and we're supposed to assume product is a fileref. I like questions to be set unambiguously, otherwise it's the error of the examiner, not the examined!
Hey Chris, SAS is case sensitive only when it comes to values but not for any reference(even header). Further, it is given clearly that the second value starts from only the 10th column so, the question is not wrong I believe. and the answer is 'C' bcz, it wasn't read using appropriate format..good luck
DeleteI ran it and received the same output as pradeep, this question is incorrect.
ReplyDeleteIf however, $25.31 did begin at column 10 then there would be a missing value in dataset inventory, this is due to invalid data for price ($ is a character and is not accepted into a numeric variable without some for of infomat e.g DOLLAR.)
The right answer should be C. The input statement should be written as "input idnum 5. @10 price DOLLAR6.2;"
ReplyDeletedollar6.2 is necessary ?
DeleteIf the price "$25.31" starts at 9th column then the price is read correctly as 25.31 without the dollar sign.I tried this.
ReplyDeleteanswer is C as you cannot use column input here as it does not accept non standard numeric data ($) hence a missing value
ReplyDeletewhat's up with this question? The answer is not in the 4 choices;
ReplyDeleteCorrect answer is C (missing) because when input statment tries to read price as number but encounters character value, so assigns a missing value to price variable.
ReplyDeleteans =d
ReplyDeleteSAS will detect the mismatched variables and will try an automatic character-to-numeric or
numeric- to-character conversion. However, this process doesn't always work. Suppose each
value of PayRate begins with a dollar sign ($). When SAS tries to automatically convert the
values of PayRate to numeric values, the dollar sign blocks the process. The values cannot be
converted to numeric values. Similar problems can occur with automatic numeric-to-character
conversion.
if you run the program in SAS:
ReplyDeletedata inventory;
input idnum 5. @10 price;
datalines;
24613 $25.31
;
run;
the answer is:
price
0.31
On the exam, I'd agree with those who say 'C' missing value as the second value submitted is non-standard data and there is no informat specified for it.
Answer is C.
ReplyDeleteIf we changed the code to
[input idnum 5. @11 price;] answer would be A.
c
ReplyDeleteAnswer is C. It is because the informat is missing in the input statement
ReplyDeleteInstead of having 2 underscores (as blogger editor won't allow spaces), place 4 underscores to make the question more reasonable
ReplyDelete-Rk
the right answer is C
ReplyDeleteif you want to read correctly that value you have to use:
input idnum 5. @10 price dollar6.2;
or
input idnum 5. @11 price;
This comment has been removed by the author.
ReplyDeletethe ans is c
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