Hi, dear R users,

I estimated a mixed-effects model with the lme function in R. In this
model, the relationship between my predictor x and the DV y follows
quadratic function. In other words, in the model, x has a positive
coefficient while x squared has a negative coefficient. I'm wondering how I
can calculate the inflection point, at which the impacts of x on y turns
positive into negative. Thanks!

Gary

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