when a variable changes in a time series how can this be tested? how can i test variance how to predict variance over time how is variance tested why is change in variance a good thing how to test change in variance over time why is variance decreasing can you test a variance change over time what is meant by changes in variance for a patient? how to test for variance how to test variation how can one test for a change in variance when is change in variance a good thing what is variance testing over time when a variable is tested with regression can you test variance over 5 time points how to test variance over time how long are regression time points why do the variance changes in the multilevel model how to test the changes in variance between time points