problems with ddply

[Antonio Pedro Ramos]

Hi all,

I am getting the following error message from a code that was working fine so far:

> income <- ddply(my.data,.(country,birth_year),summarize,income.country=unique(log_IHME_id_gdppc_c))

Error in is.list(by) : 'by' is missing

All my call from ddply is generating this complain about the "by" argument. Does it make sense? I can provide a reproducible example, if needed.

Thanks,

Antonio Pedro. 

[Ista Zahn]

Hi Antonio,

Yes, I think a reproducible example would be helpful.

Best,

Ista

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[Antonio P. Ramos]

The package Hmisc was in the path ahead of plyr and therefore its object 'summarize' was masked. That's was the problem. Thanks, Antonio Pedro. 

[Winston Chang]

This is an issue that people run into fairly often... It's a good idea
to use the British spelling 'summarise' instead -- it's the same plyr
function, and it won't conflict with the Hmisc 'summarize' function.

-Winston

[Hadley Wickham]

Plus British spelling is better ;)

Chief Scientist, RStudio
http://had.co.nz/

[Brandon Hurr]

Spoken like a member of the commonwealth.