why use time units forecast time of year how to estimate wd time time wc what is the average forecast time wd? which variable is forecasted the best what variable is wc wc when to use wc p in forecasting what is the unit of time for forecast how to do an axaca-blinder style decomposition how many units of time are there how many variables in a short time series how to forecast multiple variables how much time do i need to forecast what is the unit of time of wd p what is wd wc? how to forecast a short multivariate time series when do you use $wd$ which variable of a time series is the most likely to be decomposed into a time series? what time period are the variables in a time series