Articles by Abbas Keshvani

How to perform PCA on R

January 1, 2017 | Abbas Keshvani

This is a practical tutorial on performing PCA on R. If you would like to understand how PCA works, please see my plain English explainer here. Reminder: Principal Component Analysis (PCA) is a method used to reduce the number of variables in a dataset. We are using R’s USArrests ...
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Introducing Statwing

April 27, 2014 | Abbas Keshvani

Recently, Greg Laughlin, the founder of a new statistical software called Statwing, let me try his product for free. I happen to like free things very much (the college student is strong within me) so I gave it a try. I mostly like how easy it is to use: For ... [Read more...]

Daily Tallies on R

November 14, 2013 | Abbas Keshvani

Say you have a dataset, where each row has a date or time, and something is recorded for that date and time. If each row is a unique date - great! If not, you may have rows with the same date, and you have to combine records for the same ... [Read more...]

Types of Data on R

August 26, 2013 | Abbas Keshvani

There are different types of data on R. I use type here as a technical term, rather than merely a synonym of “variety”.  There are three main types of data: Numeric: ordinary numbers Character: not treated as a number, but as a word. You cannot add two characters, even if ... [Read more...]

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