Groupby.count

Count the occurrence of values in columns per groups

danfo.Groupby.count() [source]

Parameters: None

Return: DataFrame

Examples

Obtain the number of rows per groups

const dfd = require("danfojs-node")


let data ={A: ['foo', 'bar', 'foo', 'bar',
                'foo', 'bar', 'foo', 'foo'],
           B: ['one', 'one', 'two', 'three',
                'two', 'two', 'one', 'three'],
           C: [1,3,2,4,5,2,6,7],
           D: [3,2,4,1,5,6,7,8]
}

let df = new dfd.DataFrame(data)


let grp = df.groupby(["A"])
let grpColumnC = grp.col(["C"])
grpColumnC.count().print()

Obtain the count for two columns for each group, group by one column

Obtain the count for all columns for each group, group by one column

Obtain the count for a column for each group, group by two columns

Obtain the count for two columns for each group, group by two columns

PreviousGroupby.varNextGroupby.cumSum

Last updated

Was this helpful?