Figure 3

Number of times two topics are statistically significant in the same principal component. Grey scale map with the off diagonal entries giving the total number of times that the topics labelled by the corresponding row and column are simultaneously statistically significant across all principal components. A p-value of 0.05 with a Bonferroni correction is used so that the new p-value is \(0.05/N\) or \(3.45\times10^{-3}\). The diagonal entries are the number of times a single topic is significant at the same p-value across all principal components