[R-sig-eco] Question: Is it correct to use HCPC analysis (FactoMineR package) on categorical data

[Adnan Sisic]

Dear Sig. Ecology members,

I have categorical disease severity data, disease scale - scores from 1 (healthy plant) to 10 (heavily diseased/dying plant). In total  I have 109 isolates tested, each in 3 replicates. Is it correct to use mean score of 3 replicates for each isolate as inputs, calculate Euclidean distances between isolates and perform Hierarchical Clustering on Principal Components (HCPC) in FactoMineR package?

Thanks and best regards,



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FG �kologischer Pflanzenschutz
Universit�t Kassel
Nordbahnhofstr. 1a
D-37213 Witzenhausen
Deutschland

Dept. of Ecological Plant Protection
University of Kassel
Nordbahnhofstr. 1a
D-37213 Witzenhausen
Germany

Tel. 05542 98 1569
Fax. 05542 98 1564

www.uni-kassel.de/go/fb11-oekologischer-pflanzenschutz

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