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New posts in plyr

How to work with the orderbook with R "by" function?

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Drop unused levels from a factor after filtering data frame using dplyr

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Randomly sampling subsets of dataframe variable

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How can I use variable names to refer to data frame columns with ddply?

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how to assign a unique identifier to multiple data frame entries

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Locate and merge duplicate rows in a data.frame but ignore column order

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Using ifelse with transform in ddply

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Transpose duplicated rows to column in R

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ddply summarise proportional count

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Tag all duplicate rows in R as in Stata

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Return rows establishing a "closest value to" in R

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adding text to ggplot geom_jitter points that match a condition

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Breaking a list of character strings into partitions

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Subset a list - a plyr way?

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Producing a rolling average of ALL the previous observations per ID in an unbalanced panel data set

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Longest consecutive count of the same value per group

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How to Vectorize this R code Using Plyr, Apply, or Similar?

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continuous subgroups with ddply

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Turning a data.frame into a single row

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Beginner tips on using plyr to calculate year-over-year change across groups

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