[R] How to get the variables used in stepwise logistic regression?

[Soyeon Kim]

Dear All,

I used glm and then used step function for stepwise regression.
Now, I want to store the variables used in the stepwise regression.

The code is the following.

 m_logistic <- glm(y ~ . + M1:T + M2:T + M3:T+ M4:T +M5:T,
family=binomial("logit"), data = data)
  step_glm <- step(m_logistic)

>  step_glm$terms
 y ~ M1 + T + M1:T
attr(,"variables")
list(y, M1, T)
attr(,"factors")
   M1 T M1:T
y   0 0    0
M1  1 0    1
T   0 1    1
attr(,"term.labels")
[1] "M1"   "T"    "M1:T"
attr(,"order")
[1] 1 1 2
attr(,"intercept")
[1] 1
attr(,"response")
[1] 1
attr(,".Environment")
<environment: R_GlobalEnv>
attr(,"predvars")
list(y, M1, T)
attr(,"dataClasses")
        y        M1         T
"numeric" "numeric" "numeric"

How can I extract only "term.labels" ?

Thank you,
Soyeon