[R-sig-ME] lme4: Obtaining the SE of difference in two fixed-effects slope

[Simon Harmel]

Dear All,

I'm interested in obtaining standard error (SE) of [*meanses - ses]* estimate
in my model below which serves as the contextual effect coefficient.

Is there a way to obtain this SE in R?

hsb <- read.csv('
https://raw.githubusercontent.com/rnorouzian/e/master/hsb.csv')

fit <- lmer(math ~ ses + meanses + (1|sch.id), data = hsb)

coef(summary(fit))

             Estimate Std. Error   t value
(Intercept) 12.661262  0.1493726 84.762956
ses          2.191165  0.1086673 20.163983
meanses      3.675037  0.3776607  9.731055

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