The list of currently installed software on the cluster. If you wish to have additional software installed, please email econcluster@umd.edu.

To run a pre-written python script, type

python script.py

To install a library that doesn't come with the initial installation, you first need to create a virtual environment (where $NAME is what you choose to name your virtual environment)

python -m venv $NAME

after creating, activate the environment

source environment_name/bin/activate

(you should now see the environment on the far left of the terminal line). After that, you can simply install any library using pip from the command line

pip install pandas

You can run an R file in batch mode with

R CMD BATCH filename.R

To run your R command in the background, see Managing Jobs.

To install an R package, type in the interactive mode

install.packages($PACKAGE_NAME)

The following section comes initially from an introductory talk on R given by Paul Bailey in February 2011. The data used in the examples is located at this link.

• Based on Bell Labs S
• Open source software
  • Large group of contributors
  • Most R code is written in R
  • Computationally intensive code written in FORTRAN or C
• Datasets, matrices are native types
• Easy, customizable graphics

• Free
• Easy to get a sense of what is going on with data
• Excellent at simulation
• Interfaces with lots of other software (i.e. WINBUGS, SQL)

• Uses RAM to store data
• Support mainly via listserves
• Difficult to get started

• Some type specific methods, and a general method

  dat <- read.csv("MDemp.csv")

  and general methods

  dat <- read.table("MDemp.csv",sep=",")

• You can use the following command to get the help page for a command:

  ?

• To search for text in help text use the following command:

  ??

• Getting summaries is easy: summary(dat)
• You can also focus on one variable

summary(dat$num_child)
table(dat$num_child)

• When you reference something with [condition,] you can select rows:

dat.lf <- dat[dat$emp %in% c("emp","unemp"),]
dat.hs <- dat.lf[dat.lf$educ==39,]

• The lm function fits linear models with a formula:

lm1 <- lm(weekly_earn ~ age + year,data=dat)
summary(lm1)

• You can also treat a variable as a factor:

dat$yearf <- as.factor(dat$year)
lm2 <- lm(weekly_earn ~ age + yearf,data=dat)
summary(lm2)

• And change constraints:

contrasts(dat$yearf) <- "contr.sum"
lm3 <- lm(weekly_earn ~ age + yearf,data=dat)
summary(lm3)

• Allows you to create summary statistics for groups
• First argument is what you want to summarize
• Second argument is what you want to group by
• Their argument is what to do to the groups

agg.hs <- aggregate(dat.hs$emps,by=list(dat.lf$yq),mean)

• Results names a little odd.

• Groups two datasets by shared columns

merged <- merge(data.a,data.b)

* Lots of options for this one

Some basic info can be found at the High Performance Computing CRAN view. You can use the “parallel” package (which merges both “snow” and “multicore”).

You can also use Rmpi and npRmpi packages. You have your choice of MPI2 libraries (both OpenMPI and MPICH2). You will have to install the packages in your userspace (requiring compilation).

A good intro guide is npRmpi: A package for parallel distributed kernel estimation in R.

• merge merges datasets
• glm fits limited dependent variable models.
• optim minimizes / finds zeros
• Contributed econometrics packages

You can run a .do file in batch mode with

stata-mp -b do dofile.do

To allow your do-file to continue running when you log off from your terminal, preface the command with “nohup”. For example:

nohup stata-mp -b do dofile.do &

For more information on how to run your Stata command in the background, see Managing Jobs

By default, Stata saves tempfiles (from -tempfile- or -preserve-) to /nfs/home/$USERNAME/stata-tmp/. If you would like Stata to save temporary files in a new location (e.g. $HOME/statatmp) then from the command-line execute the follow before executing Stata:

export STATATMP=$HOME/statatmp 

One reason you might want to do this is that files are removed from /home/stata-tmp/ if they haven't been touched for a day. If you have a Stata process that runs for longer this may cause problems with reading from tempfiles or -restore-.

If you are using extra packages on your home/work computer and need them installed on the cluster, you can install them via ssc:

ssc install outreg

You will then have a folder installed within your home directory called “ado”, which contains your new commands filed away.