Get column numbers given starting values and regression specification

Get column numbers given starting values and regression specification

getColNums(start_list, reg_spec_data, alpha, j)

Arguments

start_list

starting values (can be NA's) to be fd into sfn_start_val function

reg_spec_data

result of ensureSpecRank function; regression matrix with full rank

alpha

column vector of quantiles to be estimated

j

index of quantile currently being calculated

Value

If start_list is supplied, then returns the correct column numbers to be used in regression. Otherwise, it returns NULL.