how do you do time series analysis how to analyze clinical productivity in the clinical trial what is a common time series used for why would you box data into expenses by month? what is the definition of time series in statistics why do we keep adding to bills per month why do you use a time series model what is another way of counting costs? what is the example of a time series model of productivity? why do clinical costs appear to be an expense how to calculate monthly expenses and productivity how to analyze clinical expense how to use time series analysis to study productivity? how to figure expenses over time can one look at a time series and subtract it into a month? what is the use of dates as a variable why does an electric bill show up in a month how do I find my clinical expenses how to calculate average costs per month what is the difference between a calendar month and time series analysis