In undergrad I had a computer science professor that piqued my interest in applied mathematics, beginning with Conway’s Game of Life. At first, the Game of Life (not the board game) appears to be quite simple — perhaps, too simple — but it has been widely explored and is useful for modeling systems over time.
In undergrad I had a computer science professor that piqued my interest in applied mathematics, beginning with Conway’s Game of Life. At first, the Game of Life (not the board game) appears to be quite simple — perhaps, too simple — but it has been widely explored and is useful for modeling systems over time. It has been...
I previously posted a method I used for merging a set of files into a dataframe. It wasn’t long before …
One interesting thing about R is that you can get down into the insides fairly easily. You're allowed to see more of how things are put together than in most languages. One of the ways R does this is by having first-class environments.
At first glance, environments are simple enough. An environment...
Using the Gutenberg Project’s free text of Don Quijote + Unix for Poets, here are the most used (non-short) words in Miguel de Cervantes’ famous work: 2167 Quijote 2145 Sancho 1331 porque 1053 respondió 1027 había 900 merced 813 vuestra 79...
Using the Gutenberg Project’s free text of Don Quijote + Unix for Poets, here are the most used (non-short) words in Miguel de Cervantes’ famous work: 2167 Quijote 2145 Sancho 1331 porque 1053 respondió 1027 había 900 merced 813 vuestra 79...
I am writing a set of functions to search ITIS for taxonomic information (more databases to come) and functions to fetch plant phylogenetic trees from Phylomatic. Code at github.Also, see the examples in the demos folder on the Github site above.
Sometimes when working with small paired data-sets it is nice to see/show all the data in a structured form. For example when looking at pre-post comparisons, connected dots are a natural way to visualize which data-points belong together. In R this can be easily be combined with boxplots expressing the overall distribution of the data. This
I recently found myself in the unpleasant situation of needing to read a Stata .dta file, but not having Stata readily available to me. Normally, I’d fire up a text editor and deconstruct the file, except Stata saves its data in a proprietary Binary format, meaning it garbles some of the content of the file.
Cramer's V is a measure of association for nominal variables. Effectively it is the Pearson chi-square statistic rescaled to have values between 0 and 1, as follows:V = sqrt(X^2 / )where X^2 is the Pearson chi-square, n...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
