Time series with no trend

Use this diagram to show that autocorrelation can be mistaken for trend, especially when the autocorrelation is high and the series length is small.

Click New Sample a few times to observe typical patterns when there is no autocorrelation.

Increase autocorrelation to 0.95 then take more samples. By chance, some series appear to have trend.

(Try with negative autocorrelation. rare in practice.)