topic Re: Sub-sample of the dataset in SAS Programming

Sub-sample of the dataset

pras3 — Thu, 28 Mar 2013 12:15:00 GMT

HI THERE,

I AM TRYING TO EXTRACT A SAMPLE OF FIRMS (WITH THE SAME PERMNO) THAT EXIST FROM FYEAR FROM 2001 TO 2011 AND DELETE THE FIRMS THAT HAS MISSING FYEAR AT THE BEGINNING (2001) OR AT THE END (2011) OR IN BETWEEN.

THNAK yOU FOR THE SUPPORT.

Re: Sub-sample of the dataset

AncaTilea — Thu, 28 Mar 2013 12:22:08 GMT

Could you explain this a bit more:

"THAT HAS MISSING FYEAR AT THE BEGINNING (2001) OR AT THE END (2011)"

FYEAR takes values 2001 to 2011. If it's missing....How does one know that is 2001 missing? and not 2002??

Could you provide a small sample data?

Re: Sub-sample of the dataset

RichardinOz — Thu, 28 Mar 2013 12:28:56 GMT

I think this is the answer: count the number of records with years between 2001 and 2011, and only keep those where the result is 11

Proc SQL ;

Crate table want as

Select id

From

(Select id

, count (distinct FYear) as count

From have (where = (FYear between 2001 and 2011))

)

Where count = 11

;

Quit ;

(Untested code)

Richard

Re: Sub-sample of the dataset

pras3 — Thu, 28 Mar 2013 12:38:43 GMT

Dear anca tilea,

I have attached the sample dataset.

The dataset is a sub-sample data that only include low growth firms. However there are firms which are not consistenly falling within the low growth category from 2001 to 2011 and have missing data in the dataset for few years.As firms can also be facing high growth between 2001 and 2010. I need to select firms which are consistently low growth between from 2001 and 2011 from this sample data.

Thank You.

regds