On Nov 14, 2008, at 8:12 AM, Luciano La Sala wrote:
Dear R-friends,
I am using the epicalc package and the manual by V. Chongsuvivatwong
"Analysis of epidemiological
data using R and Epicalc" to get the hang of some basic
epidemiological analyses.
After running all the analyses of chapter 7, one is supposed to wrap
it up by saving the data writing:
save(.data, file = "Chapter7.Rdata")
... after writing the command and pressing Enter, the program just
asks for more input by printing out its prompt "<".
Isn't that actually indicating that the action was successful?
Q: what am I supposed to do next?
? Perhaps you are presumed to need some rest and quitting would be
appropriate. Try quit()
Where would the data be saved and in what format?
It is saved in the working directory in .Rdata format
Can one retrieve it later?
That is what load() does for you. As the next chapter implies.
... then chapter 8 starts by loading the data saved from the
preceding chapter, writing:
zap()
load("Chapter7.Rdata")
... but, as I told you above, I am not being able to even save the
data from chapter 7 correctly, so I guess there’s nothing to load
afterwards really, and I can’t go on with the rest.
I saw no evidence that saving the file was unsuccessful. What happens
after typing the chapter 8 commands above and then entering ls() at
the R prompt? Although it's not a base function, I am presuming that
zap() is an epicalc function that cleared everything out. Don't you
see that the the data objects were loaded back into memory?
What happens when you type getwd()? Depending on your OS (which you
have not stated) you may or may not see any files with type .Rdata in
that directory, but it should be there. If you are in a Windoze
variant you may need to explicitly allow Windows Explorer to display
full file names.
Best of luck;
David Winsemius
Any tips will be very welcome!
Luciano
Argentina
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