I was able to aggregate (with sqldf, at least), after saving and re-loading the dataframe. My first guess was that h (and/or price?) now being a factor - stringsAsFactors = T by default - made the difference, and I tried to convert x$h to factor, but received an error. -- View this message in context: http://r.789695.n4.nabble.com/Failure-to-aggregate-tp2528613p2530989.html Sent from the R help mailing list archive at Nabble.com.
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