Singular Matrix Problem

Small talk on SmartPLS that does not correspond to the other forums!
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KIHO KWON
PLS Junior User
Posts: 9
Joined: Tue May 15, 2018 1:37 am
Real name and title: Mr. KIHO KWON

Singular Matrix Problem

Post by KIHO KWON »

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?
jmbecker
SmartPLS Developer
Posts: 1163
Joined: Tue Mar 28, 2006 11:09 am
Real name and title: Dr. Jan-Michael Becker

Re: Singular Matrix Problem

Post by jmbecker »

If you have three categories, you add only 2 dummy variables. If you add dummy variables for all categories you will get this error.
The category that does not have a dummy variable is the reference category (baseline).
Dr. Jan-Michael Becker, University of Cologne, SmartPLS Developer
Researchgate: https://www.researchgate.net/profile/Jan_Michael_Becker
GoogleScholar: http://scholar.google.de/citations?user ... AAAJ&hl=de
Harman
PLS Junior User
Posts: 1
Joined: Thu Nov 05, 2020 12:19 pm
Real name and title: Harmanjit Singh

Re: Singular Matrix Problem

Post by Harman »

Hi Prof. Becker,

How to interpret this aspect, i.e. baseline/reference vs dummy variables for rest of the categories?
I will appreciate if you can share some resource which I can read/watch on this.
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