![]() This is the autocorrelation at lag k = 2. We can use the following formula to calculate the autocorrelation at lag k =2. There is no built-in function to calculate autocorrelation in Excel, but we can use a single formula to calculate the autocorrelation for a time series for a given lag value.įor example, suppose we have the following time series that shows the value of a certain variable during 15 different time periods: When the autocorrelation in a time series is high, it becomes easy to predict future values by simply referring to past values. ![]() It’s also sometimes referred to as “serial correlation” or “lagged correlation” since it measures the relationship between a variable’s current values and its historical values. ![]() Autocorrelation measures the degree of similarity between a time series and a lagged version of itself over successive time intervals.
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