Class variables proc logistic

[tal83]

Hi! I use class variables in proc logistic , but I have the following problem: I want to do an explanatory variable that counts the number of missing values in var1-var20 (i'll call it num_miss)
As I use the class statement => this variable num_miss is a linear combination of var1-var20, but this is only artificially- because the category "missing value" of var1-var20 is not a real explanatory variable
Is there anyway to enter that num_miss variable without having all this troubles?
Thanks in advance.

[tal83]

Hi! I found another way to resolve my problem. Thanks