[R] Marginal Effects of continuous variable in lrm model (Design package)

[Minyu Chen]

Dear all:

When I am trying to get the marginal effects:

summary(result7,adv_inc_ratio=mean(m9201 
$adv_inc_ratio),adv_price_ratio=mean(m9201$adv_price_ratio), ...(SOME  
MORE CONTINUOUS AND DISCRETE VARIABLES BUT I AM NOT LISTING)... regW=c 
(0,mean(m9201$regW),1), regWM=c(0,mean(m9201$regWM),1))

It gave out an error message:

Error in summary.Design(result7, adv_inc_ratio = mean(m9201 
$adv_inc_ratio),  :
	ranges not defined here or with datadist for adv_inc_ratio  
adv_price_ratio agem1 change2 yr1Libor yr1Libor1mtLag yr1Libor1yrLag  
change21yrLag change21mtLag fwdReal4yr fwdInfl4yr

But I remember from my previous operation a few months ago (I  
recorded the commands) that to summary the marginal effect, I don't  
have to specify the ranges for the discrete variables. However, I use  
the command again (with slight modification because of the newly  
added variables) it doesn't work. I don't know what went wrong.

Thank you very much.

Thanks,
Minyu Chen