Artificial Intelligence By Example

Variance

Step 1: Calculate the mean of the array data1.

You can check this with the math.py, as shown in the following function:

data1 = [1, 2, 3, 4]M1=statistics.mean(data1)print("Mean data1",M1)

The answer is 2.5. The mean is not the median (the middle value of an array).

Step 2: Calculate the mean of array data2.

The mean calculation is done with the following standard function:

data2 = [1, 2, 3, 5]M2=statistics.mean(data2)print("Mean data2",M2)

The answer is:

 

The bar above the X signifies that it is a mean.

Step 3: Calculate the variance using the following equation:

Now NumPy will calculate the variance with the absolute value of each ...