Hello!
I am working with data on M&A.
I am trying to calculate the number of times a certain type of acquisition experience (coded as a dummy) occurs but only when it occurs within 5 years prior to the focal deal.
For example:
where laggains is the type of experience (dummy variable), announcedyear is the year that the experience occured and count_sg is the variable I would like to create.
(count_sg=the total number of times laggains occured within the 5 yrs prior to announcedyear)
(fyi, the variable laggains is a lagged variable so it is actually missing for the very first observation of each firm_id)
Based on Stata Tip 51: http://www.stata-journal.com/sjpdf.h...iclenum=pr0033
i tried the following code in Stata/SE 12.1
but i get invalid syntax r(198)
any suggestions/ideas as to what is wrong how I can generate the count_sg variable?
Thanks in advance!
I am working with data on M&A.
I am trying to calculate the number of times a certain type of acquisition experience (coded as a dummy) occurs but only when it occurs within 5 years prior to the focal deal.
For example:
| firm_id | laggains | announcedyear | count_sg |
| 1 | 0 | 1989 | 0 |
| 1 | 1 | 1994 | 1 |
| 1 | 1 | 1998 | 2 |
| 1 | 1 | 2000 | 2 |
| 1 | 0 | 2001 | 2 |
| 1 | 0 | 2003 | 2 |
| 1 | 1 | 2004 | 2 |
| 2 | 1 | 1999 | 1 |
| 2 | 0 | 2000 | 1 |
| 2 | 0 | 2001 | 1 |
| 2 | 0 | 2002 | 1 |
| 2 | 1 | 2003 | 2 |
| 2 | 1 | 2005 | 2 |
(count_sg=the total number of times laggains occured within the 5 yrs prior to announcedyear)
(fyi, the variable laggains is a lagged variable so it is actually missing for the very first observation of each firm_id)
Based on Stata Tip 51: http://www.stata-journal.com/sjpdf.h...iclenum=pr0033
i tried the following code in Stata/SE 12.1
:
gen count_sg=.
quietly forval i=1/'=_N' {
count if inrange(lagsmallg5d_h, 1, .) &
inrange(announcedyear['i']-announcedyear, 1, 5)
replace count_sg=r(N) in 'i'
any suggestions/ideas as to what is wrong how I can generate the count_sg variable?
Thanks in advance!