Nothing
airp.lm1 <- lm(pollution ~ location, data = AirPollution)
# specify contrasts by giving the coefficients
contr <- rbind(
c(0, 1, 0),
c(0, 0.5, -1))
# we can give our contrasts custom names if we like
contr1 <- rbind(
"hill - plains" = c(0, 1, 0),
"suburb - urban" = c(0, 0.5, -1))
msummary(glht(airp.lm1, contr1))
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