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Contributor
Posts: 21

# Calculate Firm Age

Hi,

I am trying to calculate the firm age based on FISCAL_YEAR_END_OP. I am trying to index the file in order to calculate from the first to late date of the opinion in my dataset. I am not able to output an age based on the code below.

Any help would be greatly appreciated!

proc sort data=opinion;
by COMPANY_FKEY FISCAL_YEAR_END_OP;
run;

data age;
retain index;
set opinion;
if index=. then index=0;
if COMPANY_FKEY = lag(COMPANY_FKEY) then index=index;
else index=index+1;
run;

data age;
set age;
by index;
if first.index then output age;
run;

Posts: 3,000

## Re: Calculate Firm Age

[ Edited ]
``````proc sort data=opinion;
by company_fkey fiscal_year_end_op;
run;
data age;
set opinion;
lag_company_fkey=lag(company_fkey);
if company_fkey^=lag_company_fkey then index+1;
run ;
``````

I'm not really understanding the point of your last data step.

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Paige Miller
Posts: 1,337

## Re: Calculate Firm Age

Would you please show a sample of how your starting data looks?  And how you want the result to look like?

Super User
Posts: 13,523

## Re: Calculate Firm Age

Show some example data. Is your FISCAL_YEAR_END_OP a SAS date value, a numeric that represents a year, something else?

I doubt if your "index" is at all needed.

If your FISCAL_YEAR_END_OP is a year value such as 1994 then this might be as simple as:

Proc means data=opinion range; (or since you are counting with your "index" use N instead of range to get number of records for each company_fkey)

class COMPANY_FKEY

var FISCAL_YEAR_END_OP;

run;

but without knowing what kind of values it is pretty hard to tell whether the calculation you are using is appropriate or not.

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