In a network with *T*+1 treatments and a set of studies
, *d*=1,…,*D* designs are observed. The set of studies with design *d* is given by
. The numbers of treatments in study *s* and in design *d* are given by *N*_{s} and *N*_{d} respectively.

Krahn * et al.*

Krahn * et al.* *BMC Medical Research Methodology* 2013 **13**:35 doi:10.1186/1471-2288-13-35