is the time series stationary do time series have to be stationary before standardizing do time series have to be stationary do time series have to be stationary before standardization do time series have to be stationary what do you have to measure before standardization? do you have to make a time-series stationary to get a z score? how to calculate z score using time series do time series have to be stationary do you need to be stationary in time series when making z scores do time series have to be stationary timeseries have to be stationary before it is normalized do you have to be stationary when you calculate a z score do you have to be stationary on the p score before standardizing do time series do not have to be stationary when you have a time-series do you have to be stationary what time-series does the z score belong to? do time-series have to be stationary before standardization? do time series have to be stationary before calculating do time series have to be stationary before you have to calculate z score