# Tagged Questions

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### PCA on a heterogenous correlation matrix better than MCA?

I have a questionnaire of 80 questions that I need to do dimension reduction on. About half the questions are ordinal (Likert-style questions), and the other half are qualitative/nominal. I've been ...
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### How to plot a Perception Map

I want to plot a perception map for two brands, Pepsi and Coke, with attributes sweet, caffeine, refreshment, color, likeability for each brand. I got the sample from a blind taste test.
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### Modelling with multiple-valued variables

I am about to start out analysis of a microbiological data set (ETEC: enterotoxic echerichia coli in children with diarrhea). The variables refer to the ETEC, not to the children. Some of the ...
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### Using principal components analysis vs correspondence analysis

I am analyzing a data set concerning intertidal communities. The data are percent cover (of seaweed, barnacles, mussels, etc) in quadrats. I am used to thinking about correspondence analysis (CA) in ...
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### (Multiple) Correspondence Analysis for count data entered as binary variables

I have a data set, 1014 cases and 55 variables which are binary and is in the form of ...
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### canonical correspondence analysis between two tables with eigenvectors

I have two datasets. datapcaade4$c1 has loadings from PCA with gene frequencies, biodfpcaade4$c1 has loadings from a PCA with ...
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### Mathematical formulation of correspondence analysis?

From a website you can think that Correspondence Analysis is a categorical data version of PCA. But the main usage of Correspondence Analysis is different from that of PCA, and it is more like ...
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### How to interpret this correspondence analysis plot with individuals as nominal variable?

Background: Although correspondence analysis is used mainly for visualizing similarities of categories of two or more nominal variables, I tried following: 39 students (from the same survey as in this ...
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### Detrended Correspondence Analysis - site ordination with species vectors

I have performed a Detrended Correspondence Analysis for species composition of different replicate survey sites and constructed a site ordination plot. Sites were classified into habitat types, so I ...
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### How to best display crosstab data?

I have a 10x10 matrix composed of two variables with 10 brands each. One variable is the brand purchased, the other is the brand considered. My matrix shows a crosstabulation between the two. I need ...
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### How to factor analyze two binary variables only

Normally when I do factor analysis, I have a whole bunch of variables that need to be reduced. But here I only have two binary variables (yes/no) that I need to reduce into one interval factor. Is ...
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### How to choose asymmetric biplots in correspondence analysis

I have categorical data on Police Stations against Crime categories on a 2-way contingency table. I have an asymmetric row map and column map from correspondence analysis using XLSTAT. Which one of ...
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### Discrete data & alternatives to PCA

I have a dataset of discrete (ordinal, meristic, and nominal) variables describing morphological wing characters on several closely related species of insects. What I'm looking to do is conduct some ...
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### Difference between canonical correpondence analysis and canonical correlation analysis

I am no statistical geek and this might be a very naive question.....I am sorry before hand... please share your knowledge. I am bit confused between two terms Canonical Correpondence Analysis and ...
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### Interpreting multiple correspondence analysis

I am interested in exploring how different characteristics of national pension systems are related to each other. I have used MCA for a dataset in which the rows are countries and the columns are ...
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### Dimension reduction techniques for very small sample sizes

I have 21 socio-economic and attitudinal macro-level variables (such as percentage of mothers aged 24-54 not employed, percentage of children aged 3-5 in nursery schools and so on). I also have data ...
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### Correspondence analysis on a table of means

I have a table of the following kind: Cat1 cat2 cat3 ... Var1 6.3 5.3 8.3 Var2 5.2 5.7 6.1 Var3 2.2 3.9 7.6 . . . It is a table of means for ...
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### How to perform correspondence analysis on ordinal data in SPSS?

I have 500 rows and three columns. Two of the variables (that i want to analyze) are in ordinal form and the other in scale. However, when i run the correspondence analysis wizard in SPSS i can only ...
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### Correspondence analysis for a three-way contingency table

I'm wondering how to proceed to perform Canonical Correspondence Analysis and Multiple Correspondence Analysis in R on the following three-way contingency table ...