[R] Marascuilo procedure

[MyList]

Hello All,

I am new to R and statistics.Pardon me if this a trivial question.

Can the Marascuilo procedure be applied to a 2 x c contingency table with c equal to 2 ? 

My understanding is that it is used to compare proportion between two variables and see which pairs are more significant to make the null hypothesis be rejected. Is this understanding correct?

Also, what post hoc tests can be used on categorical data using R. Can someone lead me to examples or links. I am interested in finding once the Null Hypothesis is rejected then which of the  categories are influencing. 

Null hypothesis (Ho) could be like - old ppl do not do more research before visiting a doctor.once Ho is rejected I want to find if out of old or young who actually do more research.

I am currently on a project on hypothesis testing , market survey categorical data based designed on a 7 scale lickert analysis.

Thanks in Advance.

- Harmeet