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I am trying to build a glm model with many inputs. I saw the following code in Rattle crs$glm <- glm(value ~ ., data=crs$dataset[,c(1:59,922)], family=binomial(link="logit")) I am not clear about what value ~ . means and also, I see data=crs$dataset[,c(1:59,922)] I have read that the data argument is optional here "an optional data frame, list or environment (or object