Python Tutorials · Machine Learning

Mean Median Mode

Learn all about Mean Median Mode in this comprehensive tutorial.

5 min read advanced

•What can we learn from looking at a group of numbers?
•The mean value is the average value.
•The median value is the value in the middle, after you have sorted all the values:
•The Mode value is the value that appears the most number of times:
•The Mean, Median, and Mode are techniques that are often used in Machine Learning, so it is important to understand the concept behind them.

Mean, Median, and Mode

What can we learn from looking at a group of numbers?

In Machine Learning (and in mathematics) there are often three values that interests us:

Example: We have registered the speed of 13 cars:

What is the average, the middle, or the most common speed value?

The mean value is the average value.

To calculate the mean, find the sum of all values, and divide the sum by the number of values:

The NumPy module has a method for this. Learn about the NumPy module in our NumPy Tutorial.

python

import numpyspeed = [99,86,87,88,111,86,103,87,94,78,77,85,86]
val_1 = numpy.mean(speed)print(val_1)

The median value is the value in the middle, after you have sorted all the values:

Note: It is important that the numbers are sorted before you can find the median.

The NumPy module has a method for this:

python

import numpyspeed = [99,86,87,88,111,86,103,87,94,78,77,85,86]
val_1 = numpy.median(speed)print(val_1)

Note: If there are two numbers in the middle, divide the sum of those numbers by two.

python

import numpyspeed = [99,86,87,88,86,103,87,94,78,77,85,86]
val_1 = numpy.median(speed)print(val_1)

The Mode value is the value that appears the most number of times:

The SciPy module has a method for this. Learn about the SciPy module in our SciPy Tutorial.

python

from scipy import statsspeed = 
  [99,86,87,88,111,86,103,87,94,78,77,85,86]val_1 = stats.mode(speed)print(val_1)

The Mean, Median, and Mode are techniques that are often used in Machine Learning, so it is important to understand the concept behind them.

2 questions

Which of the following is true about Mean Median Mode?

It is strictly typedIt is evaluated at runtimeIt requires explicit memory managementIt is deprecated

What is the most common pitfall when working with Mean Median Mode?

SyntaxErrorIndentationErrorNameErrorTypeError

Answer all questions to submit.