Figure 1.

Evidence structure that requires a specific choice of reference treatments if we split d _x,y. In (a), the evidence network is shown with lines to represent two‐arm trials and triangles to represent three‐arm trials. In (b) and (c), two possible parameterisations of the indirect evidence when the xy comparison is split are shown as solid lines: in (b), x is the reference treatment for the multi‐arm trial, and in (c), y is. The direct evidence is shown as dotted lines.