Python statistics module

Python statistics module provides the functions to mathematical statistics of numeric data. There are some popular statistical functions defined in this module.

mean() function

The mean() function is used to calculate the arithmetic mean of the numbers in the list.

Example

```import statistics # list of positive integer numbers  datasets = [5, 2, 7, 4, 2, 6, 8] x = statistics.mean(datasets) # Printing the mean  print("Mean is :", x)```

Output:

```Mean is : 4.857142857142857
```

median() function

The median() function is used to return the middle value of the numeric data in the list.

Example

```import statistics datasets = [4, -5, 6, 6, 9, 4, 5, -2] # Printing median of the  # random data-set  print("Median of data-set is : % s " % (statistics.median(datasets)))```

Output:

```Median of data-set is : 4.5
```

mode() function

The mode() function returns the most common data that occurs in the list.

Example

```import statistics # declaring a simple data-set consisting of real valued positive integers.  dataset =[2, 4, 7, 7, 2, 2, 3, 6, 6, 8] # Printing out the mode of given data-set  print("Calculated Mode % s" % (statistics.mode(dataset)))```

Output:

```Calculated Mode 2
```

stdev() function

The stdev() function is used to calculate the standard deviation on a given sample which is available in the form of the list.

Example

```import statistics # creating a simple data - set  sample = [7, 8, 9, 10, 11] # Prints standard deviation  print("Standard Deviation of sample is % s " % (statistics.stdev(sample)))```

Output:

```Standard Deviation of sample is 1.5811388300841898
```

median_low()

The median_low function is used to return the low median of numeric data in the list.

Example

```import statistics # simple list of a set of integers  set1 = [4, 6, 2, 5, 7, 7] # Note: low median will always be a member of the data-set.    # Print low median of the data-set  print("Low median of data-set is % s " % (statistics.median_low(set1)))```

Output:

```Low median of the data-set is 5
```

median_high()

The median_high function is used to return the high median of numeric data in the list.

Example

```import statistics # list of set of the integers  dataset = [2, 1, 7, 6, 1, 9] print("High median of data-set is %s " % (statistics.median_high(dataset)))```

Output:

`High median of the data-set is 6`