***Homework Assignment 2 Solution***
/*************
HW 2 Solution
*************/
/***2.1**/
infile id str10 bday str5 admday using x:\sya6933\week4\date1.txt,clear
gen bdate=date(bday,"md19y")
gen adate=dofm(monthly(admday,"m19y"))+14
list
+-------------------------------------------+
| id bday admday bdate adate |
|-------------------------------------------|
1. | 22102 01/21/52 7/85 -2902 9327 |
2. | 28559 07/11/48 11/92 -4191 12007 |
3. | 11451 10/28/62 5/90 1031 11092 |
+-------------------------------------------+
gen age=(adate-bdate)/365.25
format bdate %d
format adate %d
list
+--------------------------------------------------------------+
| id bday admday bdate adate age |
|--------------------------------------------------------------|
1. | 22102 01/21/52 7/85 21jan1952 15jul1985 33.48118 |
2. | 28559 07/11/48 11/92 11jul1948 15nov1992 44.34771 |
3. | 11451 10/28/62 5/90 28oct1962 15may1990 27.54552 |
+--------------------------------------------------------------+
/*****2.2*******/
. use x:\sya6933\hw2\nlsy.dta,clear
(National Longitudinal Survey of Youth, 1979, Dataset 0001)
. gen bday1=string(bday)
. gen month=substr(bday1,5,2)
(3 missing values generated)
. gen year=substr(bday1,1,4)
. destring month year,replace
month has all characters numeric; replaced as byte
(3 missing values generated)
year has all characters numeric; replaced as int
. gen day=month+10
(3 missing values generated)
. gen birthday=mdy(month,day,year)
(3 missing values generated)
. format birthday %d
. list in 1/30
+----------------------------------------------------------------------+
| id race sex bday bday1 month year day birthday |
|----------------------------------------------------------------------|
1. | 201 3 2 199303 199303 3 1993 13 13mar1993 |
2. | 202 3 2 199411 199411 11 1994 21 21nov1994 |
3. | 301 3 2 198106 198106 6 1981 16 16jun1981 |
4. | 302 3 2 198310 198310 10 1983 20 20oct1983 |
5. | 303 3 2 198604 198604 4 1986 14 14apr1986 |
|----------------------------------------------------------------------|
6. | 401 3 1 198008 198008 8 1980 18 18aug1980 |
7. | 403 3 2 199703 199703 3 1997 13 13mar1997 |
8. | 801 3 2 197603 197603 3 1976 13 13mar1976 |
9. | 802 3 1 197905 197905 5 1979 15 15may1979 |
10. | 803 3 2 198209 198209 9 1982 19 19sep1982 |
|----------------------------------------------------------------------|
11. | 1001 3 2 198301 198301 1 1983 11 11jan1983 |
12. | 1002 3 2 198807 198807 7 1988 17 17jul1988 |
13. | 1201 3 1 198910 198910 10 1989 20 20oct1989 |
14. | 1202 3 1 199308 199308 8 1993 18 18aug1993 |
15. | 1601 3 1 199002 199002 2 1990 12 12feb1990 |
|----------------------------------------------------------------------|
16. | 1602 3 1 199308 199308 8 1993 18 18aug1993 |
17. | 1603 3 2 199609 199609 9 1996 19 19sep1996 |
18. | 1901 3 2 198711 198711 11 1987 21 21nov1987 |
19. | 2001 3 2 199008 199008 8 1990 18 18aug1990 |
20. | 2501 3 1 199010 199010 10 1990 20 20oct1990 |
|----------------------------------------------------------------------|
21. | 2502 3 2 199308 199308 8 1993 18 18aug1993 |
22. | 2701 3 2 198802 198802 2 1988 12 12feb1988 |
23. | 2702 3 1 199201 199201 1 1992 11 11jan1992 |
24. | 3001 3 1 198212 198212 12 1982 22 22dec1982 |
25. | 3002 3 1 198703 198703 3 1987 13 13mar1987 |
|----------------------------------------------------------------------|
26. | 3003 3 1 199110 199110 10 1991 20 20oct1991 |
27. | 3501 3 2 199005 199005 5 1990 15 15may1990 |
28. | 3502 3 2 199306 199306 6 1993 16 16jun1993 |
29. | 3701 3 2 199004 199004 4 1990 14 14apr1990 |
30. | 4301 3 2 198210 198210 10 1982 20 20oct1982 |
+----------------------------------------------------------------------+
. display d(1jan1983)
8401
. display d(31may1983)
8551
. count if birthday>=8401&birthday<=8551
281
.
end of do-file
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