step_joint: step_conditional
In theboocock/coco: Correlation-based conditional analysis

Internal function joint_step.

1 2	step_joint(betas, ld_matrix, neffs, var_y, hwe_diag_outside, hwe_diag, return_entire_beta_set = F, exact = F, ses = NULL)

`betas`	vector of betas that will be adjusted in the matrix operations.
`ld_matrix`	LD matrix for the subset of the region.
`var_y`	variance of of the phenotype
`hwe_diag_outside`	Diagonal matrix containing the genotypic variance
`hwe_diag`	Diagonal matrix containing the genotypic variance *n
`neff`	effective sample size for each SNP in the dataset