cleanZ: clean the structure of correlations Z (if BIC improved)
In CorReg: Linear Regression Based on Linear Structure Between Variables

clean the structure of correlations Z (if BIC improved)

cleanZ(
  X = X,
  Z = Z,
  Bic_null_vect = Bic_null_vect,
  methode = 1,
  plot = FALSE,
  verbose = 1,
  star = FALSE
)

`X`	the dataset
`Z`	binary adjacency matrix of the structure (size p)
`Bic_null_vect`	the BIC of the null hypothesis (used for independent variables)
`methode`	parameter for OLS (matrix inversion) methode_BIC parameter for OLS (matrix inversion) 1:householderQr, 2:colPivHouseholderQr
`plot`	if TRUE returns the vector of BIC for each step
`verbose`	0:none, 1:BIC,step and complexity when best BIC found 2:BIC, step, complexity, nb candidates and best candidate when best BIC found
`star`	boolean defining wether classical BIC or BIC* is computed