Extracting output from `zlogit$sim()` (Zelig)

Question

I'm still trying to get used to the totally new syntax the developers of Zelig are working towards (in Zelig5, instructions for installing the current development version here). Feels very Pythonic, except, not...

Anyway, I just want to store the results of a sim exercise, but can only figure out how to print the results to the console.

Let's use the example cited in the documentation (well, sort of--updated to reflect the Zelig5 syntax seen, e.g., here):

set.seed(1234)
library(Zelig) #Zelig_5.0-5
ztob<-ztobit$new() 
ztob$zelig(durable~age+quant,data=tobin)
ztob$setx(ztob)
ztob$sim()
summary(ztob)

 sim x :
 -----
ev
      mean        sd      50%      2.5%    97.5%
1 1.534273 0.6350075 1.451001 0.5103966 3.042459
pv
         mean       sd      50% 2.5%    97.5%
[1,] 3.002031 4.027547 1.310886    0 13.19713

I don't really know what pv means (not really documented), but I'm pretty sure the expected value I want is 1.53 (under ev,mean).

Can anyone figure out how to extract that value? I can't find anything like summary.Zelig or summary.zelig; I've tried:

• summary(ztob)$ev / ztob$ev
• print(summary(ztob))
• summary(ztob)[1] / summary(ztob)[[1]]

Anything?

Answer 1

In cases like this, str is your friend.

You can get all the values:

x<-unlist(ztob[["sim.out"]][["x"]][["ev"]])

And the mean:

mean(x)