### Singular Matrix Problem

Posted:

**Thu May 17, 2018 12:47 pm**Hi.

When I add control variables, Singular Matrix Problem occurred.

Each control variables are categorical variable. So I transformed all of them to dummy variable.

My sample size is 307.

The number of control variable is 12 which are demographic variables(age, income, etc) and use experiences(watching time, platform type, favorite genre, etc).

So dummy variables are a lot.

For example, Age - dummy variable : age1(10~19old), age2(20~29old) like this.

Unfortunately, Even I read information that the software said, I don't know what dummy variable is troublesome.

How can I solve this problem?

When I add control variables, Singular Matrix Problem occurred.

Each control variables are categorical variable. So I transformed all of them to dummy variable.

My sample size is 307.

The number of control variable is 12 which are demographic variables(age, income, etc) and use experiences(watching time, platform type, favorite genre, etc).

So dummy variables are a lot.

For example, Age - dummy variable : age1(10~19old), age2(20~29old) like this.

Unfortunately, Even I read information that the software said, I don't know what dummy variable is troublesome.

How can I solve this problem?