***
***  Stata Code for creating the 4-level factors for alcohol consumption and for tobacco consumption.
*
* Create a four level tobacco group variable with ranges:
*
* tob4
*  1 =  0- 9 grams per day
*  2 = 10-19
*  3 = 20-29
*  4 = 30+
*
* We have a tobacco group variable, tobgp, defined in 9 categories as:
*
* tobgp
*  0 = None
*  1 =  1- 4 grams per day
*  2 =  5- 9
*  3 = 10-14
*  4 = 15-19
*  5 = 20-29
*  6 = 30-39
*  7 = 40-49
*  8 = 50+
*
* We create tob4 by copying tobgp and recoding its categories

gen tob4 = tobgp
recode tob4 (0/2 = 1) (3/4 = 2) (5 = 3) (6/8 = 4)

* Alcohol consumption, alc, is given in grams per day. We create a
* categorical variable for alcohol consumption with the categories:
*
* alc4
*  1 =   0- 39 grams per day
*  2 =  40- 79
*  3 =  80-119
*  4 = 120+
* 
* We create alc4 by copying alc and recoding it as:

gen alc4 = alc
recode alc4 (0/39 = 1) (40/79 = 2) (80/119 = 3) (120/max = 4)

* (end.of.file)