admisrec: Admissibility test recursion.
In lalondetl/ECLR:

This function performs the admissability test recursion for exact clustered logistic regression. 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	admisrec(nvec, zmat, zvec, s1, s2)

`nvec`	The vector of numbers of observations per cluster.
`zmat`	The vector of observed z-values.
`zvec`	The vector of (possibly incomplete) z-values.
`s1`	Observed value of the first sufficient statistic.
`s2`	Observed value of the second sufficient statistic.