SparkR (version 2.1.2)

freqItems: Finding frequent items for columns, possibly with false positives

Description

Finding frequent items for columns, possibly with false positives. Using the frequent element count algorithm described in http://dx.doi.org/10.1145/762471.762473, proposed by Karp, Schenker, and Papadimitriou.

Usage

# S4 method for SparkDataFrame,character
freqItems(x, cols, support = 0.01)

Arguments

x

A SparkDataFrame.

cols

A vector column names to search frequent items in.

support

(Optional) The minimum frequency for an item to be considered frequent. Should be greater than 1e-4. Default support = 0.01.

Value

a local R data.frame with the frequent items in each column

See Also

Other stat functions: approxQuantile, corr, cov, crosstab, sampleBy

Examples

# NOT RUN {
df <- read.json("/path/to/file.json")
fi = freqItems(df, c("title", "gender"))
# }