Author: Francisco de Abreu e Lima

Principal Component Analysis in R

Principal component analysis (PCA) is routinely employed on a wide range of problems. From the detection of outliers to predictive modeling, PCA has the ability of projecting the observations described by $latex p &s=1$ variables into few orthogonal components defined at where the data 'stretch' the most, rendering a simplified overview. PCA is particularly powerful in dealing with multicollinearity … Continue reading Principal Component Analysis in R

Probability distributions in R

Some of the most fundamental functions in R, in my opinion, are those that deal with probability distributions. Whenever you compute a P-value you rely on a probability distribution, and there are many types out there. In this exercise I will cover four: Bernoulli, Binomial, Poisson, and Normal distributions. Let me begin with some theory first: Bernoulli … Continue reading Probability distributions in R