Runs a pooled first-difference regression with time dummies and returns a two-column data.frame mapping each time period to its estimated common dynamic process value. The reference time period (the first one after differencing) has CDP 0.
.amg_common_dynamic_process(panel, y_name, x_names)A two-column data frame: time and cdp.
A panel data.frame from .make_panel().
Character: dependent variable name.
Character: regressor names (level variables).