admis2: Initialization of admissibility test recursion, two-level...
In lalondetl/ECLR:

This function initializes the admissability test recursion for exact clustered logistic regression, two-level model. The matrix of admissable vectors starts as observed values, zvec. The final output is a matrix whose columns are z-vectors that give the same sufficient statstics as those observed.

1	admis2(nvec, zvec, jvec)

`nvec`	The vector of numbers of observations per cluster.
`zvec`	The vector of observed z-values (the sum of successses in cluster).
`jvec`	The numbers of inner clusters in each outer cluster.