WageData                Earnings data from the Panel Study of Income
                        Dynamics
are_varying             Check if variables are constant or variable
                        over time.
asym                    Estimate asymmetric effects models using first
                        differences
asym_gee                Asymmetric effects models fit with GEE
complete_data           Filter out entities with too few observations
fdm                     Estimate first differences models using GLS
formula.wbm             Retrieve model formulas from 'wbm' objects
get_wave                Retrieve panel_data metadata
heise                   Estimate Heise stability and reliability
                        coefficients
is_panel                Check if object is panel_data
line_plot               Plot trends in longitudinal variables
long_panel              Convert wide panels to long format
make_diff_data          Generate differenced and asymmetric effects
                        data
make_wb_data            Prepare data for within-between modeling
model_frame             Make model frames for panel_data objects
nlsy                    National Longitudinal Survey of Youth data
nobs.wbm                Number of observations used in 'wbm' models
panel_data              Create panel data frames
predict.wbgee           Predictions and simulations from within-between
                        GEE models
predict.wbm             Predictions and simulations from within-between
                        models
summary.panel_data      Summarize panel data frames
teen_poverty            National Longitudinal Survey of Youth teenage
                        women poverty data
tidy.asym               Tidy methods for 'fdm' and 'asym' models
tidy.asym_gee           Tidy methods for 'wbgee' models
tidy.wbm                Tidy methods for 'wbm' models
unpanel                 Convert panel_data to regular data frame
wbgee                   Panel regression models fit with GEE
wbm                     Panel regression models fit via multilevel
                        modeling
wbm-class               Within-Between Model ('wbm') class
wbm_stan                Bayesian estimation of within-between models
widen_panel             Convert long panel data to wide format
