https://communities.sas.com/t5/SAS-Procedures/Class-variables-proc-logistic/m-p/43454#M11353 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)<BR /> As I use the class statement =&gt; this variable num_miss is a linear combination of var1-var20, but this is only <B>artificially</B>- because the category "missing value" of var1-var20 is not a real explanatory variable<BR /> Is there anyway to enter that num_miss variable without having all this troubles?<BR /> Thanks in advance. Tue, 02 Sep 2008 12:06:08 GMT tal83 2008-09-02T12:06:08Z https://communities.sas.com/t5/SAS-Procedures/Class-variables-proc-logistic/m-p/43454#M11353 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)<BR /> As I use the class statement =&gt; this variable num_miss is a linear combination of var1-var20, but this is only <B>artificially</B>- because the category "missing value" of var1-var20 is not a real explanatory variable<BR /> Is there anyway to enter that num_miss variable without having all this troubles?<BR /> Thanks in advance. Tue, 02 Sep 2008 12:06:08 GMT https://communities.sas.com/t5/SAS-Procedures/Class-variables-proc-logistic/m-p/43454#M11353 tal83 2008-09-02T12:06:08Z https://communities.sas.com/t5/SAS-Procedures/Class-variables-proc-logistic/m-p/43455#M11354 Hi! I found another way to resolve my problem. Thanks Wed, 03 Sep 2008 20:10:14 GMT https://communities.sas.com/t5/SAS-Procedures/Class-variables-proc-logistic/m-p/43455#M11354 tal83 2008-09-03T20:10:14Z