R Under development (unstable) (2023-06-12 r84534 ucrt) -- "Unsuffered Consequences"
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> 
> ### fixed effects models
> ### methods and tests contributed by Grant McDermott (@grantmcdermott)
> 
> library("multcomp", quietly = TRUE)

Attaching package: 'TH.data'

The following object is masked from 'package:MASS':

    geyser

> 
> fixestOK <- require("fixest", quietly = TRUE)
> if (fixestOK) {
+     lmod  <- lm(Sepal.Length ~ Sepal.Width + as.factor(Species), iris)
+     fmod  <- feols(Sepal.Length ~ Sepal.Width + as.factor(Species), iris)  
+     fmod2 <- feols(Sepal.Length ~ Sepal.Width | Species, iris, vcov = "iid") ## see next model too
+     fmod3 <- feols(Sepal.Length ~ Sepal.Width | Species, iris) ## default vcov is clustered by Species
+ 
+     glmod  <- glht(lmod, "Sepal.Width==0")
+     gfmod  <- glht(fmod, "Sepal.Width==0")
+     gfmod2 <- glht(fmod2, "Sepal.Width==0")
+     gfmod3 <- glht(fmod3, "Sepal.Width==0", vcov = "iid")
+     stopifnot(all.equal(confint(glmod)$confint, confint(gfmod)$confint))
+     stopifnot(all.equal(confint(glmod)$confint, confint(gfmod2)$confint))
+     stopifnot(all.equal(confint(glmod)$confint, confint(gfmod3)$confint))
+ }
> 
> proc.time()
   user  system elapsed 
   1.06    0.17    1.23