SPSS has the Count Values within Cases option, but R does not have an equivalent function. Here are two functions that you might find helpful, each of which counts values within cases inside a rectangular array. (more…)
OptinMon 34 - Getting Started with R
R Is Not So Hard! A Tutorial, Part 16: Counting Values within Cases
August 19th, 2014 by David Lillis
R Is Not So Hard! A Tutorial, Part 15: Counting Elements in a Data Set
August 13th, 2014 by David Lillis
Combining the length() and which() commands gives a handy method of counting elements that meet particular criteria.
b <- c(7, 2, 4, 3, -1, -2, 3, 3, 6, 8, 12, 7, 3)
b
Let’s count the 3s in the vector b. (more…)
Random Sample from a Uniform Distribution in R Commander
July 23rd, 2014 by Karen Grace-Martin
Why We Needed a Random Sample of 6 numbers between 1 and 10000
As you may have read in one of our recent newsletters, this month The Analysis Factor hit two milestones:
- 10,000 subscribers to our mailing list
- 6 years in business.
We’re quite happy about both, and seriously grateful to all members of our community.
So to celebrate and to say thanks, we decided to do a giveaway to 6 randomly-chosen newsletter subscribers.
I just sent emails to the 6 winners this morning.
How We Randomly Generated 6 Equally Likely Values out of 10000 Using R Commander (more…)
Generalized Linear Models in R, Part 3: Plotting Predicted Probabilities
July 2nd, 2014 by David Lillis
In our last article, we learned about model fit in Generalized Linear Models on binary data using the glm() command. We continue with the same glm on the mtcars data set (regressing the vs variable on the weight and engine displacement).
Now we want to plot our model, along with the observed data.
Although we ran a model with multiple predictors, it can help interpretation to plot the predicted probability that vs=1 against each predictor separately. So first we fit a glm for only (more…)
R Is Not So Hard! A Tutorial, Part 14: Pie Charts
March 27th, 2014 by David Lillis
In Part 14, let’s see how to create pie charts in R. Let’s create a simple pie chart using the pie() command. As always, we set up a vector of numbers and then we plot them.
B <- c(2, 4, 5, 7, 12, 14, 16) (more…)
R Programming Video: 15 Tips for The Beginner
March 25th, 2014 by Karen Grace-Martin
One of our instructors–David Lillis–recently gave a talk in front of the Wellington R Users Group highlighting 15 Tips for using the R statistical programming language aimed at the beginner.
Below is a video recording of his presentation…