R help - Feb 2010 - Changing an unordered factor into an ordered factor

I'm trying to change an unordered factor into an ordered factor:
 
data96$RV961327 <- data96$V961327
data96$RV961327[data96$V961327 %in% levels(data96$V961327)[4]] <- NA
data96$RV961327[data96$V961327 %in% levels(data96$V961327)[5]] <- NA
data96$RV961327 <- factor(data96$RV961327)
attributes(data96$RV961327)
levels(data96$RV961327)
data96$RV961327
 
data96$RRV961327 <- ordered(data96$RV961327, levels=c("Oppose",
"Haven't thought much about this", "Favor"))
attributes(data96$RRV961327)
levels(data96$RRV961327)
data96$RRV961327
cbind(data96$V961327, data96$RV961327, data96$RRV961327)
table(data96$V961327, data96$RV961327)
table(data96$V961327, data96$RRV961327)
 
The first block of code works.
 
However, when I run the ordered command, it only turns all the values into
NA's. According to attributes, however, they have been transfered into an
ordered factor....but still show up as NA's.
 
 
Help

Hi Mathew,
> I'm trying to change an unordered factor into an ordered factor:
> Help

  it's all about reordering the factor levels, right?

Have a look at this one:
http://rwiki.sciviews.org/doku.php?id=tips:data-factors:factors

The third textbox on the page (search for the string: "Reorder factor
levels") provides a piece of sample code for the task. Should be easy to
adapt it to your problem.

Oliver

P.S.: Maybe it's not a bad idea to provide a more readable
transformation of your code next time. What about replacing the whole
'V961327' thing by 'x' for example?