when do you divide observations into two when to split the time series to groups can you find an event and split the data? can you split a series of observations are the two observations in a time series autocorrelated can a variable be split into different group and time series are time series auto correlated can i split a variable into two groups can you split a variable into groups can you split data by time period can a time series be split into two groups when does the event happen if an event is autocorrelated how often is the variable split into two groups can two observations be used to split variables why do we split a time series when to do a t test on time series can i split data into group or series what is a split time series when are time series of observations uncorrelated what is the difference between a time series and a time series?