I am attaching three different residual plots. I am trying to determine whether heteroskedasticity is present. I don’t believe I see any pattern indicative of heteroskedasticity (nonconstant variance). I know it can be difficult to detect – do you see any indication of this?
Please see attached file.
Your residual plots appear to be stationary which is a good indication of not having heteroskedasticity. But if you want to be sure in a quantitative basis try any test for randomness on your residual sequence. One good test in the autocorrelation function because a random sequence will have only a significant lag cero value …
The solution discusses whether heteroskedasticity is present.