Fig. 9
From: Time varying causal network reconstruction of a mouse cell cycle
Principal Components of Cdkn2d gene expression profile. a Scree plot of the Eigenvalues shows the ordered eigenvalues of the lag-covariance matrix corresponding to the gene expression profile of Cdkn2d. We can see a dramatic change in slope of the eigenvalue plot at the fourth component. Therefore, from what is observed in this plot, it is reasonable to retain the first three largest eigenvalues and group them together to select the set I. b Explained variance for the first eight largest principal components that explain 95% of the cumulative variation. The fourth and higher components explain very little variation and thus the first three largest eigenvalues can be grouped together in group I