ACF                     Autocorrelation function
HP                      Hodrick-Prescott filter
PACF                    Partial autocorrelation function
adf                     Augmented Dickey Fuller Test
allpos_helper           All possible regression internal
bg                      Breusch-Godfrey test [BG test]
bp                      Breusch-Pagan test
check_betas             All possible regression variable coefficients
checkdata               Data check for errors
coeff_length            Coefficients length
corsel                  Multicollinearity test
dec_plot                Decomposition plot
difflog                 Transforming time-series data to stationary
gq                      Godfrey-Quandt test
macroKZ                 macroKZ dataset
opt_size                Necessary size of the time-series dataset
pct1                    Transforming time-series data to stationary
pct4                    Transforming time-series data to stationary
reg_plot                Regression forecast plot
reg_test                Test for detecting violation of Gauss-Markov
                        assumptions.
regsel_f                Regressors selection
vif_reg                 VIF by variable
