The authors would like to provide a clarification in relation to several aspects of the article:
While the article cites heat maps in several occasions, we appreciate that it could have been made clearer that the article is not describing a new tool for visualization of data but rather a simpler application of an existing one; we would thus like to make the following changes to the Abstract and Introduction sections:
Abstract, first sentence of Method section should read:
Method: We propose a simple use of an existing tool for visualization of data, known as a ''quilt plot'' (also defined as "heat maps"), that provides an alternative to presenting large volumes of data as frequency tables.
Introduction (second paragraph, last sentence) should read:
In the statistical literature, ''quilt plots'' (also known as ''image plots'' and "heat maps"), have been underutilised for the display of categorical data [5,6]. We would also like to clarify that the term 'quilt plot' was originally developed by Douglas Nychka -reference 5 in the article. In addition, in compliance with the journal's policy, we are providing the codes for the R functions described in the article:
Citation: The PLOS ONE Staff (2014) Correction: Quilt Plots: A Simple Tool for the Visualisation of Large Epidemiological Data. PLoS ONE 9(3): e93201. https://doi.org/10.1371/journal.pone.0093201
Published: March 18, 2014
Copyright: © 2014 The PLOS ONE Staff. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.