How to do lm with dplyr

Here is an example with mtcars (pinched from http://varianceexplained.org/r/broom-intro/)

library(dplyr)
library(broom)
mtcars %>% group_by(am) %>% do(tidy(lm(mpg ~ wt, .)))

so in your case

library(dplyr)
library(broom)
abalone %>% 
    group_by(Sex)  %>% 
    do(tidy(lm(Diameter~Whole.weight, .)))

should work.

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