---
title: "Comment by Bebo E on \"Time Series Forecasting Lab (Part 2) - Feature Engineering with Recipes\" | Hashnode"
description: "Hi , great work! I wanted to quickly ask. When augmenting lags and rolling features and then you split test and train, isn't there significant leakage in th"
url: "https://hashnode.com/posts/time-series-forecasting-lab-part-2-feature-engineering-with-recipes/61d5c777e2f29f0805e13d7a/comment/6374c8c2e1d53a5fd290def3"
---

[Discussion](https://hashnode.com/posts/time-series-forecasting-lab-part-2-feature-engineering-with-recipes/61d5c777e2f29f0805e13d7a)

Comment [Time Series Forecasting Lab (Part 2) - Feature Engineering with Recipes](https://hashnode.com/posts/time-series-forecasting-lab-part-2-feature-engineering-with-recipes/61d5c777e2f29f0805e13d7a)

[Bebo E](https://hashnode.com/@naivebayes1)

[Nov 16, 2022](https://hashnode.com/posts/time-series-forecasting-lab-part-2-feature-engineering-with-recipes/61d5c777e2f29f0805e13d7a/comment/6374c8c2e1d53a5fd290def3)

Hi , great work! I wanted to quickly ask. When augmenting lags and rolling features and then you split test and train, isn't there significant leakage in the test set due to the rolling features seeing the actual values for turnover?

[JG](https://hashnode.com/@TheGoat)

[Feb 18, 2025](https://hashnode.com/posts/time-series-forecasting-lab-part-2-feature-engineering-with-recipes/61d5c777e2f29f0805e13d7a/comment/6374c8c2e1d53a5fd290def3#reply-67b4fb0963d5fa72ea83ced1)

Did you get an answer to this?