Unused argument error in SD code

Hi I'm trying to determine the standard deviation of one continous variable for a subset of a population that does not have a specific confounding variable.
What is wrong my code here? This is coming up with the "unused argument" error message.

sd(hers$glucose, subset=hers$D==0)


xx  <- subset(hers, hers$D == 0)

or using tidyverse

hers  %>% filter(D ==  0) %>%  summarize(ss = sd(glucose))

I'm not understanding how this factors in the first variable of hers$glucose. (And the tidyverse part looks like a cat walking across a keyboard to me-I don't understand how this works).

My fault. I was running through a test case and pasted the wrong code.

I'll correct it.

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