Grokbase Groups R r-help January 2012

Such a model consists of a series of terms separated by +operators.
In the above ,term means individual variable.
The terms themselves consist of variable and factor names separated by : operators.
What does term mean in this?
Such a term is interpreted as the interaction of all the variables and factors appearing in the term.
What does interaction mean, and what does term mean here ?

Xiaobo Gu

From: David Winsemius
Date: 2012-01-19 21:46
To: guxiaobo1982
CC: r-help; ds5j
Subject: Re: [R] What does the : operator mean in glm formulas
On Jan 19, 2012, at 8:02 AM, Xiaobo Gu wrote:


I see the following is the credit scoreing in R guide :

m2<-glm(formula = good_bad ~ checking + duration + history+ purpose
+amount + savings + employed + installp + marital +
coapp +age + other + depends + telephon + foreign +checking:amount

What does checking:amount mean?


David Winsemius, MD
West Hartford, CT

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