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Update README.md #37

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6 changes: 3 additions & 3 deletions README.md
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PHP package that provides functions for calculating mathematical statistics of numeric data.

In this package I'm collecting some useful statistic functions.
Once upon a time, I was playing with FIT files. A FIT file is a file where is collected a lot of information about your sport activities. In that file you have the tracking of your Hearth Rate, Speed, Cadence, Power etc.
Once upon a time, I was playing with FIT files. A FIT file is a file where is collected a lot of information about your sport activities. In that file you have the tracking of your Heart Rate, Speed, Cadence, Power etc.
I needed to apply some statistic functions to understand better the numbers and the sport activity performance. I collected some functions like mean, mode, median, range, quantiles, first quartile ( or 25th percentile), third quartile (or 75th percentile), frequency table (cumulative, relative), standard deviation (population and sample), variance (population and sample) etc...

> This package is inspired by the [Python statistics module](https://docs.python.org/3/library/statistics.html)
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### Freq class
With *Statistics* package you can calculate frequency table.
A frequency table is list the frequency of various outcomes in a sample.
A frequency table lists the frequency of various outcomes in a sample.
Each entry in the table contains the frequency or count of the occurrences of values within a particular group or interval.


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### Calculate Frequency Table

Statistics packages has some methods for generating Frequency Table:
Statistics packages have some methods for generating Frequency Table:
- frequencies(): a frequency is the number of times a value of the data occurs;
- relativeFrequencies(): a relative frequency is the ratio (fraction or proportion) of the number of times a value of the data occurs in the set of all outcomes to the total number of outcomes;
- cumulativeFrequencies(): is the accumulation of the previous relative frequencies;
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