Input file GPA()

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Daan Laméris

Aug 10, 2021, 9:40:59 AM8/10/21
to FactoMineR users
Hi everyone!

I'm planning to run generalised procrustes analyses with data obtained using free choice profiling. The GPA() function seems very helpful to run these analyses.

From what I can see, the function is able to perform all planned steps in the analyses, but I'm not entirely sure if I can enter the data that I'm planning to collect. Through free choice profiling I will have a number of observers come up with descriptive terms for different objects. Each observer is free to choose their own terms. Hence, I will obtain m matrices (one/observer), containing n rows (one/object) * p columns (one/term). 

This means that each observer can/will end up with a different number of terms (thus, columns). Normally, we add zeros to complete each column. 

From the documentation I found that df = a data frame with n rows (individuals) and p columns (quantitative variables). 

Does anyone has an idea if/how can enter the data I'm planning to collect? 

Many thanks in advance!

Francois Husson

Aug 12, 2021, 4:42:04 AM8/12/21
Yes you can use the function GPA.
You will have 1 df with n rows and p columns, and then you use the argument group to list the number of columns (terms) used by each group (observer in your case).
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Francois Husson
Department Statistics & Computer science
65 rue de St-Brieuc - 35042 RENNES
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Daan Laméris

Aug 16, 2021, 6:13:44 AM8/16/21
to FactoMineR users
Hi François,

Thank you for your answer, it works perfectly!

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