Figure 3.

The test for a gene with ${\beta }_i$ varying from ${\hat{\beta }}_{\text{shared}}$ was computed for each gene. Those likelihood ratio test statistics ($LR{T}_{{\beta }_i\ne {\beta }_{\text{shared}}}$) are plotted against the log of the $\beta$ parameter estimated for each gene ($log({\hat{\beta }}_i)$) in a volcano plot. The dashed line indicates the value of ${\hat{\beta }}_{\text{shared}}$.