Mutltiple Correspondence Analysis (Part 1/4: Data - issues)

[@ellaphelps]

Super explication, merci d’avoir pris le temps de l’enregistrer!! Très clair et utile!

[@Adelphos0101]

Great for introduction into MCA, thank you.

[@Apahom]

Great video. thank you Francois!

[@saumitrasinha89]

This is really great! Thank you!

[@MarlasMusings]

Thank you so much for this! Looking at some survey census data now for research.

[@MP-ds7ed]

Dr Husson, thank you for the depth and the quality of your analysis. Can we perform Multiple Correspondence Analysis in panel data when data is recorded in different points in time ? or it is the case that multiple correspondence analysis is applicable only to cross section data.

[@alexanderyau6347]

Hi, in your video 5:09, is that one-hot encoding?

[@HussonFrancois]

That is the way to encode data when performing MCA.

[@alexanderyau6347]

Thank you, What if I have preprocessed the data with one-hot encoding when using MCA? Do any methods that support PCA mixed with MCA? Since in some data, there are both continuous variables and categorical variables.

[@HussonFrancois]

You can use the function FAMD (factor analysis for mixed data). It handles continuous and categorical variables simultaneously.

[@alexanderyau6347]

Thank you, I found FAMD is a function in FactoMineR package. I have processed the data with one-hot encoding.

[@javierbadajozdavila8145]

Hi, Can MCA be used with likert scales?

[@5b2y3f6]

非常感谢~

[@kibromadinoabate4777]

it is very informative can you help me get mca for asset index ??

[@simbobcrafts4843]

I don’t understand what the letters mean for eg - j J I k etc

[@HussonFrancois]

I is the number of individuals J the number of variables J the number of categories

[@simbobcrafts4843]

François Husson thank you

[@murtadaalbaraq2545]

Hello Sir, Thanks for this video but I need help on how I can extract data from the survey. Thanks

[@macmillana.bonomali3972]

Hallo Mourtada, to extract data from a survey i.e questionnaires, you will need to develop a data mask either in excel or directly into the software y0u intend to use for data analysis

[@guilhermeparreira5448]

Hi There! Great video. I am wondering if the questionnaire ( 2003 INSEE Survey) itself is available online. In fact, I want to know whether the hobbie question is a multiple choice or if it is a yes/no question. Even tough I am reading the section 3.7.1.1 Designing a Questionnaire: Choice of Format of your book, I am still in doubt how to deal with multiple choice and overlapping questions in MCA. Do you have any other material or video that explain that? Thanks in advance.

[@HussonFrancois]

A multiple choice variable is handled with as many variables as there are choices. And then, each new variable takes the values yes or no.

[@turningandknives]

I find your notation very confusing. What is J, j, K, and k. What is the difference between a category and variable?

[@HussonFrancois]

A variable is the gender and the categories are Male and Femele. j is the j-th variable and there is a total of J variables. k is the k-th category and there is a total of K categories (from all the variables)

[@lollipop85]

You're adorable. Even though I don't understand much, I think it has to do more with me than you. Nonetheless, thank you for your videos :)

[@simbobcrafts4843]

Impossible to understand