Braulio Mark Valencia Loadings are viewed as the coefficients of the linear combination of the starting variables used to create the main components. In terms of numbers, the loadings are equal to the variable coordinates divided by the square root of the eigenvalue associated with the component.

Thanks a lot, Qamar Ul Islam !

Can I create the main components using one of the outputs generated by R? These outputs are coord, contrib, and cos2.

Hope you can help me resolve this silly question. I'm new in these fields, apologies if these are really basic questions.

Dear Braulio Mark Valencia . See kindly the following useful links: https://biosakshat.github.io/pca.html

http://www.sthda.com/english/articles/31-principal-component-methods-in-r-practical-guide/112-pca-principal-component-analysis-essentials/

https://rpubs.com/pg2000in/PrincipalComponentAnalysis

Thanks so much, Aref Wazwaz ! I used them entirely and finally exported results using write.infile(res.pca, "pca.txt", sep = "\t")

This file, however, contains, the values (coord, contrib, and cos2) that I described before but it's still unclear if any of these (coord, contrib, or cos2) are equivalent to the main component or not. Or if something else should be done with these in order to create my main components.

Hope you can clarify this because it is not in the tutorials (I think).

Kind regards,

B

You are most welcome dear Braulio Mark Valencia

Wish you the best always

Braulio Mark Valencia pleasure, The c() method may also be used to generate a list. The c() method coerces items into the same type; for example, if there is a list among the elements, then all elements are converted into list components.

This blog may be beneficial further: https://cran.r-project.org/doc/manuals/r-release/R-intro.html