Frequency distribution of grouped data

[stevensgsp]

Not an issue - just a question
Is there a function in your library that can get Frequency distribution of grouped data?

This is, return data to fill a Frequency Distribution table of grouped data.
Calculating class intervals, interval width (indicating the interval width), mean for grouped data, median for grouped data and mode for grouped data.

This links explains what I mean:
https://www.onlinemathlearning.com/make-frequency-table.html
https://www.toppr.com/guides/maths/statistics/frequency-distribution/

Thanks!

[markrogoyski]

Hi @stevensgsp,

Thanks for your interest in MathPHP.

Currently there are basic frequency distributions. You can use them like this:

use MathPHP\Statistics\Distribution;

$grades = ['A', 'A', 'B', 'B', 'B', 'B', 'C', 'C', 'D', 'F'];

// Frequency distributions (frequency and relative frequency)
$frequencies          = Distribution::frequency($grades);         // [ A => 2,   B => 4,   C => 2,   D => 1,   F => 1   ]
$relative_frequencies = Distribution::relativeFrequency($grades); // [ A => 0.2, B => 0.4, C => 0.2, D => 0.1, F => 0.1 ]

// Cumulative frequency distributions (cumulative and cumulative relative)
$cumulative_frequencies          = Distribution::cumulativeFrequency($grades);         // [ A => 2,   B => 6,   C => 8,   D => 9,   F => 10  ]
$cumulative_relative_frequencies = Distribution::cumulativeRelativeFrequency($grades); // [ A => 0.2, B => 0.6, C => 0.8, D => 0.9, F => 1   ]

If there is something more you think would be useful, please let us know and describe what the input and output would be. If there are other libraries where this is implemented as a reference, like R or Excel, for example, that is useful too.

Thanks,
Mark

[stevensgsp]

Hello,

Thanks for your quick response.

I'm going to prepare description of input and output.

In any case, I will surely develop this functionality since I need it, so I could give you that.

[markrogoyski]

Hi @stevensgsp,

Any update on this? If you can provide some example input and output?

Thanks,
Mark