Tuesday, November 23, 2010

Principal Component Analysis: Which variables contribute most to principal components ?

Principal component analysis (PCA) is a mathematical transformation of possibly(correlated) variables into a number of uncorrelated variables called principal components. The resulting components from this transformation is defined in such a way that the first principal component has the highest variance and accounts for as most of the variability in the data (see http://wapedia.mobi/en/Scree_plot)

For each principal component you can see which variables contribute
most to that component. Depending on what you used to do PCA in R, you
can use loadings() function. Loadings function gives a matrix that
shows how each variable contribute to the principal components. You
can do barplots for each principal component. That will visualize what
contributes to which principal component.  You should do the barplots
for absolute values in the loadings matrix.

Take a look at the sources below, especially the second one

check here basic usage of PCA function in R

check here for detailed explanation on loadings()
especially check the section : "How do we know which species
contribute to which axes? We look at the component loadings (or
"factor loadings"): "


  1. Great explanation. Other awesome ressources on PCA: http://www.sthda.com/english/wiki/factominer-and-factoextra-principal-component-analysis-visualization-r-software-and-data-mining

  2. You would know whether you have not learned anything in your life if there is not a solitary decent change in you previously, then after the fact leaving educational foundation. Use that opportunity to enhance yourself and contribute wellbeing to the general public.click to explore

  3. Just like it education also need a component that modify it in better ways. These analysis is also good for them .essay editors

  4. this is so informative post. It's so helpful for me.
    career goals mba essay .

  5. My guess is that you just hate plagiarism. you are a smart author, and any time you produce a piece of writing, a journal post or the other little bit of writing, you are doing your best to craft a bit that's as compact and clear as attainable. In fact, i might go to this point on say, that your propensities ar nearer to a T than anything. Given the very fact that plagiarism is anathema to you, what may probably be the matter with internet sites that check for it? during this article i am going to share that with you. my blog

  6. A precise English writing and synchronic linguistics checking tool is obligatory to bring slightly of sense and magnificence to your work. English writing and synchronic linguistics checking computer code provides advanced technological answer for our basic writing, writing and proofreading wants. during this world surroundings wherever most of the daily communication takes place on the net by writing e-mails, memos or reports, we tend to notice associate degree increasing trend in use of advanced language writing, writing and process tools. visit the site

  7. Nice tips specially appreciate tips about the proofreading that With regards to redrafting and editing a bit of composing, the most critical things to pay special mind to are linguistic use and language structure blunders.

  8. Numerous find out the reasoning by the time they finish their thesis, albeit however, by trial-and-error. Yet below is the rationale for the various steps in research study as well as thesis writing. homepage to see more