Counting dummy variables for each person in SAS? - count

Question

I have a large data set that has multiple rows for each individual. Each individual has a unique ID, and each row is coded as a dummy 1 or a 0 as to the type of doctor's visit it is. IE: A visit can be at the doctor's office, so if it is, it is coded as 1, if it is not, it is coded by 0. I want to count how many of each visits to each type of doctor each individual has. I tried using the count distinct:
proc sql;
create table all as select ID;
count (distinct doctor) as doctor1
from data
group by ID;
quit;
However, this does not seem to be giving me what I want.
Any help or pointers on what codes to use would be really appreciated.
Sample data:
data this;
datalines;
rid dateofvisit doctor hospital clinic;
1 1/1/2014 1 0 0
1 1/3/2014 0 1 0
2 1/5/2014 1 0 0
3 1/6/2014 1 0 0
1 1/7/2014 1 0 0
3 1/8/2014 0 0 1

Answer 1

The count function will normally count all occurrences. Together with distinct, it will count the number of different kinds of occurances. This is not your wish, if I understand you correctly.
Since your occurances is coded with ones, you could use the sum function to calculate how many times your patient has visited the different kinds of doctors.
proc sql;
create table all as select rid,
sum (doctor) as doctor_visits,
sum (hospital) as hospital_visits,
sum (clinic) as clinic_visits,
sum(sum(doctor, hospital, clinic)) as total_visits
from this
group by rid;
quit;