[R] Single line command for variance of marginal distribution in 2 D linear regression?

[Vern]

Dear forum,

we have a 2 dimensional normal distribution of (x, y) which is consistent
with a linear regression modell of type

y = ax + b.

It has a heteroscedastic variance.

Is there a straight and simple way with R to get the variance of the
marginal distribution W(y|x=xi) where xi may be randomly chosen? Maybe a
single line command?

Thank you
best regards


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