Four dimensions in two dimensions

scatterplot of reaction time differences

This scatterplot is one of the best data visualisation I made. I like it because it concentrates a lot of information into a single visualisation. The scatterplot displays four dimensional data (i.e., four variables) using a two dimensional scatterplot. I made the first implementation in R, but because I wanted to add interactivity I switched to d3.js. Below I describe the choices I made to display the information and how I coded them in d3.js. Continue reading “Four dimensions in two dimensions”

Four dimensions in two dimensions

Visualizing participants performance [wbwit III]

This is the third post on the development of a web-based word identification task. See this post for the implementation of the word identification task and this post for uploading the participants results to the server. This post describes how to plot the Continue reading “Visualizing participants performance [wbwit III]”

Visualizing participants performance [wbwit III]

Uploading data to the server [wbwit II]

Uploading the data gathered from the web-based version of the word identification task (i.e., lexical decision – see this post) to a MySQL database was more challenging than expected. The problem is that there is a limit on the size of data which could be transfered with an ajax XMLHttpRequest (ajax call from now on) from the web-page to the host server. It took quite a bit of trial-and-error to discover that the problem was Continue reading “Uploading data to the server [wbwit II]”

Uploading data to the server [wbwit II]

Web-based word-identification task [WBWIT I]

A method to collect a massive amount of experimental data on cognitive human behavior is every experimenter’s dream. Not having to sit in the lab waiting while a participant is performing the task or the possibility of having multiple participants completing the task at once are only two of the main advantages. However, Continue reading “Web-based word-identification task [WBWIT I]”

Web-based word-identification task [WBWIT I]