Converting binomial variables with Yes/No into variables that display 1/0

[u58469353]

I am trying to perform logistic regression on a dataset that contains several binomial variables. How do I convert multiple variables with "yes" and "no" as the only inputs to "0" and "1"? 

I have looked at some other questions on here where users asked similar questions, however, I can't seem to get it to work. When I tried, all of the values for the variable changed to 1, with no values showing 0. 

[Tom]

Let's assume you mean a binary variable. (A binomial variable is a number that represents the count, or sum, of a series of binary variables. In other words a variable whose values follow a binomial distribution.).

If the variable contains text like YES or No then you cannot convert it into a number in the same variable.  You can either convert the strings '1' an '0'.  Or make a new variable.

Here is simple conversion that takes advantage of the fact that SAS will evaluate boolean expressions to 1 when True and 0 when false.

data want;
  set have;
  new_var = old_var= 'yes';
run;

But be careful.  Are the values only exact 'yes' or 'no'?  Do you ever have missing values?  If so this code will convert those to zero (false) instead of missing.  Is the case of the string consistent?  Do you ever have 'Yes' or 'YES' or 'Y' or 'y' instead of 'yes'?

[u58469353]

All of the values in the field are either 'Yes' or 'No'

[u58469353]

All of the values for the variable are wither 'Yes' or 'No'

[PaigeMiller]

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@u58469353 wrote:

All of the values for the variable are wither 'Yes' or 'No'

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Please examine your data and the code you are using very very carefully. 'Yes' is not the same as 'yes'. Can you see the difference?

[u58469353]

This does not work. Causes all values in the new variable to be 0

[PaigeMiller]

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@u58469353 wrote:

I am trying to perform logistic regression on a dataset that contains several binomial variables. How do I convert multiple variables with "yes" and "no" as the only inputs to "0" and "1"? 

I have looked at some other questions on here where users asked similar questions, however, I can't seem to get it to work. When I tried, all of the values for the variable changed to 1, with no values showing 0. 

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For a Logistic regression, you should not have to convert anything. "yes" and "no" should work fine without creating 0 and 1. So make your life simple, don't create the 0 and 1 variable. (How easy is that?)

[Kurt_Bremser]

Please post your code in a code box.