EDCAT

Computerized adaptive test for eating disorders.

The survey is specified by the files in the data directory, which were extracted from MultiCATinput_EPSI_09-21-18.RData in the demo Shiney app.

PiLR Calculated Content API

PiLR EMA surveys can delegate their content to a service implement the API defined in KU Cat Design - Remote Calculation Card. The function pilrContentApi() implments the API when invoked via openCPU.

jopenCPU libray path

curl -d '' -H 'content-type: application/json' https://ocpu.pilrhealth.com/ocpu/library/base/R/.libPaths/json

["/usr/lib/R/library", "/usr/local/lib/opencpu/site-library", "/usr/local/lib/R/site-library", "/usr/lib/R/site-library", "/usr/lib/opencpu/library"]

• /usr/lib/R/library - base R
• /usr/local/lib/opencpu/site-library - empty
• /usr/local/lib/R/site-library - pilr.dpu stuff (not used)
• /usr/lib/R/site-library - KU installs here
• /usr/lib/opencpu/library - openCPU

Note, however, that the openCPU install performs the abomination of replacing some directories in /usr/lib/R/library with symbolic links to packages in /usr/lib/opencpu/library. So those pacakges can't be overridden by isntalls into the other library directories.

Install on openCPU server

Install on ocpu.pilrhealth.com:

REF=${1:-"master"}
sudo Rscript --slave --no-save --no-restore-history -e "
  lib='/usr/lib/R/site-library'
  .libPaths(c(lib, '/usr/lib/R/library', '/usr/local/lib/opencpu/site-library', '/usr/local/lib/R/site-library', '/usr/lib/R/site-library', '/usr/lib/opencpu/library'))
  library(remotes)

  # next 3 lines only needed if dependency versions change
  remove.packages(intersect(installed.packages(), c('mirt', 'mirtCAT', 'EDCAT')), lib=lib)
  install_github(repo='https://github.com/philchalmers/mirt.git', ref='v1.30', force=TRUE)
  install_github(repo='https://github.com/philchalmers/mirtCAT.git', ref='v1.9.3', force=TRUE)

  # Only this needed for updating just EDCAT
  install_github(repo='https://github.com/MeiResearchLtd/EDCAT.git', ref='$REF')
  "

Note that install_github won't install dependencies IF you don't use the 'lib' parameter!

Testing with Curl

There are some sample JSON requests in the tests/testthat/ directory that were captured from the EMA console. They can be submitted with the following command.

curl -H"Content-Type":"application/json" -d @request.json \
      https://ocpu.pilrhealth.com/ocpu/library/EDCAT/R/pilrContentApi/json

JSON to R Translation

openCPU's translation from JSON to R data structures is unpredictable and changes depending on the version of openCPU. I have been unable to find any documentation. It appears to use the jsonlite package, but not with unknown settings.

So to create data for unit tests, use the curl command in the previous section, but replace the function 'pilrContentAPI' with 'dumper'. This will return a string containain an R expression that constructs a list of the input parameters as decoded by openCPU.