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Focal Point    Focal Point Forums  Hop To Forum Categories  WebFOCUS/FOCUS Forum on Focal Point     Generating a Random Sample with Criteria

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Generating a Random Sample with Criteria
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lindbo
Member
posted
Hi,
I need to generate a random sample with built-in criteria. For example, I need a random sample of 10 records but I need to make sure that I have at least one person named Joe in that sample. I know how to generate a random sample but can't figure out how to set a condition. Thanks.


WebFOCUS 7.1.4, Windows XP
 
Posts: 3 | Registered: March 08, 2007Report This Post
Danny-SRL
Virtuoso
posted Hide Post
Hi Lindbo,

Say you want to extract 10% of the records in the file. I would suggest you extract 10% of all "Joe" records and 10% of all the others.

Something like this:

-SET &R=INT(10*RDUNIF('D6.4'));
-SET &CAR=COUPE;
-* Create a CAR file with more than 18 records
TABLE FILE CAR
PRINT COUNTRY CAR BODYTYPE 
ON TABLE HOLD AS GEN
-REPEAT #GEN 10 TIMES;
MORE
FILE CAR
-#GEN
END
-RUN
-* Retrieve 10% of records having &CAR  and 10% of records not having &CAR 
DEFINE FILE GEN
RAND/I1 WITH BODYTYPE = IF BODYTYPE NE '&CAR' THEN INT(10*RDUNIF('D6.4')) ELSE 0;
RBOD/I1 WITH BODYTYPE = IF BODYTYPE NE '&CAR' THEN 0 ELSE INT(10*RDUNIF('D6.4'));
END

TABLE FILE GEN
HEADING
"R=&R "
PRINT COUNTRY CAR BODYTYPE
WHERE (RAND EQ &R) OR (RBOD EQ &R);
END


Does this fit?


Daniel
In Focus since 1982
wf 8.202M/Win10/IIS/SSA - WrapApp Front End for WF

 
Posts: 1980 | Location: Tel Aviv, Israel | Registered: March 23, 2006Report This Post
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