In my work, I make extensive use of the statistical software package/environment R. One of the great strengths of R is the large number of add-on packages that extend the functionality of R (i.e., the functionality of the base/standard packages that are installed by default) in various ways. Here, I keep track and list packages that I make use of on a (semi)regular basis. My work would be many magnitudes more difficult if these packages (and R itself!) did not exist.
linear.hypothesis
and Anova
.optimize
, optim
, nlminb
, constrOptim
, nlm
functions). For root finding, I use the uniroot
function.optim
), the Hooke-Jeeves algorithm, and the Mesh Adaptive Direct Searches (MADS) algorithm.mvrnorm
function for generating data from a multivariate normal distribution and fitdistr
for fitting univariate distributions.kde2d
function for 2d kernel density estimation and plotting.