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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?

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The solution discusses whether heteroskedasticity is present.

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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 ...

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