The DER is an test for recognition of emotions in dance videos
We also advise mentioning the software versions you used,
in particular the versions of the DER and psychTestR packages.
You can find these version numbers from R by running the following commands:
library(DER)
library(psychTestR)
if (!require(devtools)) install.packages("devtools")
x <- devtools::session_info()
x$packages[x$packages$package %in% c("DER", "psychTestR"), ]-
If you don't have R installed, install it from here: https://cloud.r-project.org/
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Open R.
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Install the ‘devtools’ package with the following command:
install.packages('devtools')
- Install the DER:
devtools::install_github('klausfrieler/DER')
You can demo the DER at the R console, as follows:
# Load the DER package
library(DER)
# Run a demo test, with feedback as you progress through the test,
# and not saving your data
DER_demo()
# Run a demo test, skipping the training phase, and only asking 5 questions, as well a changing the language
DER_demo(num_items = 5, language = "en")The DER_standalone() function is designed for real data collection.
In particular, the participant doesn't receive feedback during this version.
# Load the DER package
library(DER)
# Run the test as if for a participant, using default settings,
# saving data, and with a custom admin password
DER_standalone(admin_password = "put-your-password-here")You will need to enter a participant ID for each participant. This will be stored along with their results.
Each time you test a new participant,
rerun the DER_standalone() function,
and a new participation session will begin.
You can retrieve your data by starting up a participation session, entering the admin panel using your admin password, and downloading your data. For more details on the psychTestR interface, see http://psychtestr.com/.
The DER currently supports English (en), German (de), and formal German (de_f).
You can select one of these languages by passing a language code as
an argument to DER_standalone(), e.g. DER_standalone(languages = "de"),
or alternatively by passing it as a URL parameter to the test browser,
eg. http://127.0.0.1:4412/?language=DE (note that the p_id argument must be empty).
- Complete the installation instructions described under 'Local use'.
- If not already installed, install Shiny Server Open Source: https://www.rstudio.com/products/shiny/download-server/
- Navigate to the Shiny Server app directory.
cd /srv/shiny-server
- Make a folder to contain your new Shiny app. The name of this folder will correspond to the URL.
sudo mkdir DER
- Make a text file in this folder called
app.Rspecifying the R code to run the app.
- To open the text editor:
sudo nano DER/app.R - Write the following in the text file:
library(DER)
DER_standalone(admin_password = "put-your-password-here")- Save the file (CTRL-O).
- Change the permissions of your app directory so that
psychTestRcan write its temporary files there.
sudo chown -R shiny DER
where shiny is the username for the Shiny process user
(this is the usual default).
- Navigate to your new shiny app, with a URL that looks like this: `http://my-web-page.org:3838/DER
By default, the DER implementation always estimates participant abilities using weighted-likelihood estimation. We adopt weighted-likelihood estimation for this release because this technique makes fewer assumptions about the participant group being tested. This makes the test better suited to testing with diverse participant groups (e.g. children, clinical populations).
- The DER runs in your web browser.
- By default, image files are hosted online on our servers. The test therefore requires internet connectivity.