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Using StandardScaler() Function to Standardize Python Data

In this article, we will be focusing on one of the most important pre-processing techniques in Python – Standardization using StandardScaler() function.

So, let us begin!!

Need for Standardization

Before getting into Standardization, let us first understand the concept of Scaling.

Scaling of Features is an essential step in modeling the algorithms with the datasets. The data that is usually used for the purpose of modeling is derived through various means such as:

  • Questionnaire
  • Surveys
  • Research
  • Scraping, etc.

So, the data obtained contains features of various dimensions and scales altogether. Different scales of the data features affect the modeling of a dataset adversely.

It leads to a biased outcome of predictions in terms of misclassification error and accuracy rates. Thus, it is necessary to Scale the data prior to modeling.

This is when standardization comes into picture.

Standardization is a scaling technique wherein it makes the data scale-free by converting the statistical distribution of the data into the below format:

  • mean – 0 (zero)
  • standard deviation – 1


By this, the entire data set scales with a zero mean and unit variance, altogether.

Let us now try to implement the concept of Standardization in the upcoming sections.

Python sklearn StandardScaler() function

Python sklearn library offers us with StandardScaler() function to standardize the data values into a standard format.


object = StandardScaler()

According to the above syntax, we initially create an object of the StandardScaler() function. Further, we use fit_transform() along with the assigned object to transform the data and standardize it.

Note: Standardization is only applicable on the data values that follows Normal Distribution.

Standardizing data with StandardScaler() function

Have a look at the below example!

from sklearn.datasets import load_iris
from sklearn.preprocessing import StandardScaler
dataset = load_iris()
object= StandardScaler()
# Splitting the independent and dependent variables
i_data =
response =
# standardization 
scale = object.fit_transform(i_data) 


  1. Import the necessary libraries required. We have imported sklearn library to use the StandardScaler function.
  2. Load the dataset. Here we have used the IRIS dataset from sklearn.datasets library. You can find the dataset here.
  3. Set an object to the StandardScaler() function.
  4. Segregate the independent and the target variables as shown above.
  5. Apply the function onto the dataset using the fit_transform() function.

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