what is principal component analysis what is the principal component analysis what is the difference between a time series and a pca what is the average % of time per observation per country in a ppa? what is data type pcca when do you use principal component analysis how many observation are there in a time series? what is pca? when to use principal component analysis what is ar_p1 what is principal component analysis with time series what is the principal analysis in pca when you use a principal component analysis (ppa) the data usually looks like the following: what is the principal component analysis of the dataset? which data is used for a principal component analysis? what is pca in stats what is the principal component in an observational analysis? which data type is used to do principal component analysis and when can we do pca? what is principal component analysis data what is the pca dataset?