How to introduce LAG time in Python?

How to introduce LAG time in Python?

How to introduce LAG time in Python?

This recipe helps you introduce LAG time in Python


Recipe Objective

Have you ever tried to shift the datetime to create a lag between data and datetime.

So this is the recipe on we can introduce LAG time in Python.

Step 1 - Import the library

import pandas as pd

We have imported pandas which is needed.

Step 2 - Setting up the Data

We have created a dataset by making features and assining values to them. We have used date_range function to create a datetime dataset with frequency as Weekly. df = pd.DataFrame() df["dates"] = pd.date_range("11/11/2016", periods=5, freq="W") df["stock_price"] = [1.1,2.2,3.3,4.4,5.5]

Step 3 - Creating Lag in data

For better understanding we are first creating a lag of 1 unit and then a lag of 2 unit. We cah do this by shift function. df["previous_days_stock_price"] = df["stock_price"].shift(1) print(df) df["previous_days_stock_price"] = df["stock_price"].shift(2) print(df) So the output comes as

       dates  stock_price  previous_days_stock_price
0 2016-11-13          1.1                        NaN
1 2016-11-20          2.2                        1.1
2 2016-11-27          3.3                        2.2
3 2016-12-04          4.4                        3.3
4 2016-12-11          5.5                        4.4

       dates  stock_price  previous_days_stock_price
0 2016-11-13          1.1                        NaN
1 2016-11-20          2.2                        NaN
2 2016-11-27          3.3                        1.1
3 2016-12-04          4.4                        2.2
4 2016-12-11          5.5                        3.3

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