On Jun 19, 2009, at 9:00 AM, onyourmark wrote:
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 ~ .
Generally the "." in a formula indicates all of the remaining
variables without interactions.
?"formula" # although I did not find that particular convention
documented in a cursory review of that page .
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 coercible by
as.data.frame to a data frame) containing the variables in the
model. If not
found in data, the variables are taken from environment(formula),
typically
the environment from which glm is called"
when they say "data", is that meant to include the dependent
variable as
well.
Yes.
In other words,
in the above statement 'value' is the dependent variable and it is
also
column 922 in the data set.
Is this correct?
Yes.
correct
Thank you.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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