find_optimum_iterate: Find Optimum Brute Force
In thogaertner/cinof1: Analyse causal inferences in N-of-1 studies

This function finds the best psi value brute forced

find_optimum_iterate(
  data,
  outcome,
  exposure,
  confounder,
  id,
  upper_bound_psi,
  lower_bound_psi,
  steps,
  corstr = "independence"
)

`data`	data frame with patient data
`outcome`	outcome string
`exposure`	exposure string
`confounder`	list of confounders
`id`	id variable
`upper_bound_psi`	upper psi
`lower_bound_psi`	lower psi
`steps`	steps between lower and upper psi
`corstr`	a character string specifying the correlation structure. The following are permitted: '"independence"', '"exchangeable"', '"ar1"', '"unstructured"' and '"userdefined"'
`number_it`	current iteration