Dear altruist, I have the following sas dataset:
data have; input Year_Month$ Month$ Year$ Company_ID$ Profit Announcement: yymmdd10.; format Announcement yymmdd10.; cards; 200101 01 2001 1001 0.00256 . 200101 01 2001 1002 0.00256 2001-01-25 200101 01 2001 1003 0.00256 . 200101 01 2001 1004 0.00256 2001-01-26 200101 01 2001 1005 0.00256 . 200102 02 2001 1001 0.00214 . 200102 02 2001 1002 0.00214 . 200102 02 2001 1003 0.00214 2001-02-12 200102 02 2001 1003 0.00214 2001-02-13 200102 02 2001 1004 0.00214 . 200102 02 2001 1005 0.00214 . 200102 02 2001 1006 0.00214 . 200103 03 2001 1001 0.33652 . 200103 03 2001 1002 0.33652 2001-03-31 200103 03 2001 1003 0.33652 . 200103 03 2001 1004 0.33652 2001-03-16 200103 03 2001 1005 0.33652 . 200201 01 2002 1001 0.01402 . 200201 01 2002 1002 0.01402 . 200201 01 2002 1003 0.01402 2002-01-25 200201 01 2002 1004 0.01402 2002-01-25 200201 01 2002 1005 0.01402 . 200201 01 2002 1006 0.01402 . 200202 02 2002 1001 0.10201 . 200202 02 2002 1002 0.10201 2003-01-25 200202 02 2002 1003 0.10201 2003-01-26 200202 02 2002 1004 0.10201 . 200202 02 2002 1005 0.10201 . run;
As you can see, in every month of a year, certain companies make Announcements, while others do not. On the basis of the variable Year_Month, I want to create a new variable Ann_in_month which will be equal to 1 if a company makes an announcement in that particular month, and 0 otherwise. Thus, for every month of a given year, this entire process would be repeated. Essentially, I am expecting the following output:
Year_Month
Month
Year
Company_ID
Profit
Announcement
Ann_in_month
200101
01
2001
1001
0.00256
.
0
200101
01
2001
1002
0.00256
20010125
1
200101
01
2001
1003
0.00256
.
0
200101
01
2001
1004
0.00256
20010126
1
200101
01
2001
1005
0.00256
.
0
200102
02
2001
1001
0.00214
.
0
200102
02
2001
1002
0.00214
.
0
200102
02
2001
1003
0.00214
20010212
1
200102
02
2001
1003
0.00214
20010213
1
200102
02
2001
1004
0.00214
.
0
200102
02
2001
1005
0.00214
.
0
200102
02
2001
1006
0.00214
.
0
200103
03
2001
1001
0.33652
.
0
200103
03
2001
1002
0.33652
20010331
1
200103
03
2001
1003
0.33652
.
0
200103
03
2001
1004
0.33652
20010316
1
200103
03
2001
1005
0.33652
.
0
200201
01
2002
1001
0.01402
.
0
200201
01
2002
1002
0.01402
.
0
200201
01
2002
1003
0.01402
20020125
1
200201
01
2002
1004
0.01402
20020125
1
200201
01
2002
1005
0.01402
.
0
200201
01
2002
1006
0.01402
.
0
200202
02
2002
1001
0.10201
.
0
200202
02
2002
1002
0.10201
20030125
1
200202
02
2002
1003
0.10201
20030126
1
200202
02
2002
1004
0.10201
.
0
200202
02
2002
1005
0.10201
.
0
I thank you for your kind support!
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