I need to generate 5 binary variables but each observation must take 1 in one variable and zero in the other 4 variables.I need the code for this case
Can anyone help in this case
Thanks in advance
Within data step:
Set all five binary variables to zero;
Then use select construct or if-then else construct or other appropriate strategy to assign 1 to the appropriate binary variable.
Hope that helps.
but in this case only the first two variables will be zero and 1 but the other 3 all zeros because the condition for the second variable would be =0 if var1=1 and =1 if var1=0 so I canot use this
I am assuming you have an underlying variable with 5 levels or categories, then you could try this:
Assuming a pre-existing variable to generate the binary variables from:
Suppose x can be equal to 1, 2, 3, 4 or 5. Then do something like this:
b1 = 0 ;
b2 = 0 ;
b3 = 0 ;
b4 = 0;
b5 = 0;
Select (x) ;
when (1) b1 = 1 ;
when (2) b2 = 1 ;
when (3) b3 = 1 ;
when (4) b4 = 1 ;
when (5) b5 = 1;
end ;
so you will end up with data set like this:
x b1 b2 b3 b4 b5
1 1 0 0 0 0
2 0 1 0 0 0
3 0 0 1 0 0
4 0 0 0 1 0
5 0 0 0 0 1
If instead you want the binary variables based on line numbers, you could do some like this:
if mod(_n_,5) = 0 then x = 5 ;
else x = mod(_n_,5) ;
then add code from above.
If this does not do it, I am really confused about what you are trying to do.
Or, if you need to randomly assign which b variable gets a one, you could use something like:
data want (drop=i pop);
array b(5);
do pop=1 to 1000;
do i=1 to 5;
b(i)=0;
end;
b(int(5*ranuni(0))+1)=1;
output;
end;
run;
I have problem in generating x with values 1 to 5. how can I generate it?
You have to explain what you mean. int(5*ranuni(0))+1 would generate a number between 1 and 5.
I mean I wrote
proc iml;
x=j(60,5,.);
x=int(5*ranuni(0))+1;
but only one observation is generated and I need 60 observations with 5 variables
I'm not familiar enough with proc iml to help you. In the datastep I showed, above, changing the value of
do pop=1 to 1000;
to
do pop=1 to 60;
would give you 60 records with 5 variables.
hi ... not IML, just a couple data steps ...
* 60 observations, x ranges from 1 to 5;
data x;
do _n_ = 1 to 60;
x = ceil(5*ranuni(0));
output;
end;
run;
* add binary variables based on value of x;
data x;
array b(5) (5*0);
set x;
b(x) = 1;
output;
b(x) = 0;
run;
I am not really familiar with data generation and when I just copied your code it was accepted but the data was not showed to me it is clear that i am missing one command to get the data produced.
From both Mike's and my code, the data files would be shown in your work directory.
I got the data
Thank you all for your help
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