Figure 3

A visualisation of the statistical model. This figure shows all monthly data points on log-transformed axes for the number of contracted curator hours (c ') and the number of revisions made (r '), colour-coded to distinguish between points from before and after the switch to DVCS-based workspaces. Overlaid on this figure is the estimator $\widehat{\alpha }$, shown as a horizontal intercept, the estimator $\widehat{\gamma }$, shown as the red line $\widehat{\alpha }+\widehat{\gamma }c\text{'}$, and $\widehat{\beta }$, shown as the green line $\widehat{\alpha }+\widehat{\beta }+\widehat{\gamma }{c}^{\text{'}}$. In addition, dashed lines corresponding to the boundaries of the 95% confidence interval for each parameter is shown (note that each confidence interval is shown separately, and so, for example, the dashed green lines do not include uncertainty about γ).