Hello Jay, I know that an old post but I really need to calculate KMO for my data and this is the only thread I found on the subject. I'm a very newby to R so sorry for the odd questions. It looks like in your reply that you use "kmo" as a function and you apply it to your data "D"... I tried that on my data but it says "Error: couldn't find function "kmo"". I installed and loaded the package "corpcor" but it still doesn't work... did I get it wrong? Also i would like to use the complete function (see http://tolstoy.newcastle.edu.au/R/help/05/12/17235.html), but I don't really understand how to use it... where should I enter the data directory?? I thank you a lot for your help. Thibault -- View this message in context: http://r.789695.n4.nabble.com/How-to-calculate-KMO-tp904281p3445697.html Sent from the R help mailing list archive at Nabble.com.
How to calculate KMO?
3 messages · Thibault Grava, G. Jay Kerns
Dear Thibault, On Tue, Apr 12, 2011 at 5:06 PM, Thibault Grava
<tybo.tout.seul at gmail.com> wrote:
Hello Jay, I know that an old post but I really need to calculate KMO for my data and this is the only thread I found on the subject. I'm a very newby to R so sorry for the odd questions. It looks like in your reply that you use "kmo" as a function and you apply it to your data "D"... I tried that on my data but it says "Error: couldn't find function "kmo"". I installed and loaded the package "corpcor" but it still doesn't work... did I get it wrong? Also i would like to use the complete function (see http://tolstoy.newcastle.edu.au/R/help/05/12/17235.html), but I don't really understand how to use it... where should I enter the data directory?? I thank you a lot for your help. Thibault
Please forgive me, but I'm not sure I really understand what your question is. My advice would be to go here: https://stat.ethz.ch/pipermail/r-help/2007-August/138049.html and copy-paste the function listed there - it looks like kmo = function( data ){ ...bunch of stuff here... } # end of kmo() into an R session, for instance, on the Windows RGui. If you like, you can test that everything works with the example shown right below that (just copy-paste, again). You don't need any corpcor package, all you need is MASS which should have shipped with the R you are using. You also don't need a data directory. What you need is a matrix (called "X" in my message) with the data stored in the correct order/positions. See the Trujillo-Ortiz et al. discussion (linked in my message) for lots more detail about what the matrix means and how to set it up. If you are having trouble setting up a data matrix in general then I recommend the R documentation which you can find under the Help menu. I just double-checked and both the function and example still work like a charm, almost 4 years later. (?!) Good luck, and I hope this helps. Jay ______________________________ G. Jay Kerns, Ph.D. Youngstown State University http://people.ysu.edu/~gkerns/
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