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”

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Four dimensions in two dimensions

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]