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One way, two way and n way ANOVA are used to test difference in means when we have one, two and n factor variables. A key assumption when performing these ANOVAs is that the measurements are independent. When we have repeated measures this assumption is violated, so we have to ... [Read more...]

About the book This is a technical book. The scope of the book is to go straight to the point and the writing style is similar to a recipe with detailed instructions. It is assumed that you know the basics of R and that you want to learn how to ... [Read more...]

Hey R fans! We've just released a new episode of DataCamp's DataChats video series. Our first episode with Max Kuhn has already been watched over 700 times and this new episode promises to be a blockbuster as well.  In this second episode we inte... [Read more...]

Here’s a new package that brings to R new API to handle child processes – similar to how Python handles them. Unlike the already available system() and system2() calls from the base package or the mclapply() function from the parallel package, this new API is aimed at handling long-lived child ... [Read more...]

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[In the exercises below we cover the basics of data frames.] Answers to the exercises are available here. Exercise 1 Consider two vectors: x=seq(1,43,along.with=Id) y=seq(-20,0,along.with=Id) Create a data.frame df: __df Id Letter x y 1 1 a 1.000000 -20.000000 2 1 b 4.818182 -18.181818 3 1 c 8.636364 -16.363636 4 2 a 12.454545 ... [Read more...]

Chicago's a great city for a bike-sharing service. It's pretty flat, and there are lots of wide roads with cycle lanes. I love Divvy and use it all the time. Not so much in the winter though: it gets very cold here. Nonetheless, this heat map of Divvy riders, created ... [Read more...]

Make a simulation and function using R. I continue to teach some R programming in my AP Stats class because this is an essential skill for them to have. We are now in chapter five of our textbook, Probability and Simulation. I had my students review the parking problem on ... [Read more...]

One of my early programming projects in Python was a word game solver (example: word jumble solver) – the early version was a simple script, which grew [...] The post Simple Anagram Finder Using R appeared first on ProgrammingR. [Read more...]

Modeling the frequency is one of the most important aspects in operational risk models. In the previous post (https://statcompute.wordpress.com/2016/05/13/more-flexible-approaches-to-model-frequency), the importance of flexible modeling approaches for both under-dispersion and over-dispersion has been discussed. In addition to the quasi-poisson regression, three flexible frequency modeling techniques, including generalized ... [Read more...]

CRAN just accepted the newest release 0.1.1 of anytime, following the previous five releases since September. anytime is a very focussed package aiming to do just one thing really well: to convert anything in integer, numeric, character, factor, ordered, ... format to POSIXct (or Date) objects -- and to do so without ... [Read more...]

In this set of exercises we will practice functions that enable us to manipulate strings.You can find more about string manipulation functions in Handling and Processing Strings in R e-book. Answers to the exercises are available here. If you have different solution, feel free to post it. Exercise 1 Load ... [Read more...]

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