Nothing
ind <- (trawl$Year == 1 & trawl$Zone == 1 & !is.na(trawl$Depth))
score1 <- trawl$Score1[ind]
depth <- trawl$Depth[ind]
summary(lm(score1 ~ depth))
sig.trace(sm.regression(depth, score1,
model = "no.effect", display="none"),
hvec = seq(5, 20, length = 10))
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