Missing values (dummy variables / categorial variables)

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Boddien
PLS User
Posts: 12
Joined: Thu Aug 31, 2017 12:52 pm
Real name and title: Boddien

Missing values (dummy variables / categorial variables)

Post by Boddien » Tue May 14, 2019 10:06 am

Dear Forum,

I have
- 2 missing values for a nominal dummy-coded variable (0/1) (moderator analysis)
- 7 missing values for a categorial variable (age groups 1, 2, 3, 4, 5) (control variable)
- 6 missing values for a categorial variable (hierarchy groups 1, 2, 3, 4) (control variable)

I have marked these values with -99.
I did not use the method of replacing the average because of the scales´ level although the rule of < 5% applied.
How should I deal with the missing values? Or can I just leave it like it is and run the analysis?

Thank you very much in advance.

Best regards,
Boddien

jmbecker
SmartPLS Developer
Posts: 1010
Joined: Tue Mar 28, 2006 11:09 am
Real name and title: Dr. Jan-Michael Becker

Re: Missing values (dummy variables / categorial variables)

Post by jmbecker » Mon May 20, 2019 3:09 pm

Using mean replacement does not make sense for categorical variables that are dummy coded. You may use pairwise or casewise deletion.
Dr. Jan-Michael Becker, University of Cologne, SmartPLS Developer
Researchgate: https://www.researchgate.net/profile/Ja ... v=hdr_xprf
GoogleScholar: http://scholar.google.de/citations?user ... AAAJ&hl=de

Boddien
PLS User
Posts: 12
Joined: Thu Aug 31, 2017 12:52 pm
Real name and title: Boddien

Re: Missing values (dummy variables / categorial variables)

Post by Boddien » Fri May 24, 2019 6:01 am

Thanks a lot for your advice, Dr. Becker.

Best regards,
Boddien

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