NAG Library Manual, Mark 28.6
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```    Program g11cafe

!     G11CAF Example Program Text

!     Mark 28.6 Release. NAG Copyright 2022.

!     .. Use Statements ..
Use nag_library, Only: g11caf, nag_wp
!     .. Implicit None Statement ..
Implicit None
!     .. Parameters ..
Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
Real (Kind=nag_wp)               :: dev, tol
Integer                          :: cm, i, ifail, ip, iprint, ldz, lwk,  &
m, maxit, n, n0, ns
!     .. Local Arrays ..
Real (Kind=nag_wp), Allocatable  :: b(:), cov(:), sc(:), se(:), wk(:),   &
z(:,:)
Integer, Allocatable             :: cnt(:), ic(:), isi(:), isz(:),       &
nca(:), nct(:)
!     .. Intrinsic Procedures ..
Intrinsic                        :: count, maxval, sum
!     .. Executable Statements ..
Write (nout,*) 'G11CAF Example Program Results'
Write (nout,*)

!     Skip heading in data file

!     Read in problem size and control parameters
Read (nin,*) n, m, ns, maxit, iprint, tol

ldz = n
Allocate (z(ldz,m),isz(m),ic(n),isi(n),nca(ns),nct(ns),cnt(ns))

!     Read in data

!     Read in variable inclusion flags

!     Calculate IP
ip = count(isz(1:m)>0)

!     Calculate number of observations in the model and maximum number of
!     observations in any stratum
cnt(1:ns) = 0
Do i = 1, n
If (isi(i)>0 .And. isi(i)<=ns) Then
cnt(isi(i)) = cnt(isi(i)) + 1
End If
End Do
cm = maxval(cnt(1:ns))
n0 = sum(cnt(1:ns))

lwk = ip*n0 + (cm+1)*(ip+1)*(ip+2)/2 + cm
Allocate (b(ip),se(ip),sc(ip),cov(ip*(ip+1)/2),wk(lwk))

!     Read in initial estimate for B

!     Calculate parameter estimates
ifail = 0
Call g11caf(n,m,ns,z,ldz,isz,ip,ic,isi,dev,b,se,sc,cov,nca,nct,tol,      &
maxit,iprint,wk,lwk,ifail)

!     Display results
Write (nout,99999) ' Deviance = ', dev
Write (nout,*)
Write (nout,*) ' Strata     No. Cases   No. Controls'
Write (nout,*)
Write (nout,99998)(i,nca(i),nct(i),i=1,ns)
Write (nout,*)
Write (nout,*) ' Parameter      Estimate', '       Standard Error'
Write (nout,*)
Write (nout,99997)(i,b(i),se(i),i=1,ip)

99999 Format (A,E13.4)
99998 Format (3X,I3,10X,I2,10X,I2)
99997 Format (I6,10X,F8.4,10X,F8.4)
End Program g11cafe
```