How Rows increasing when i try to do feature engineering?

@premsheth wrote:

Hello,

I am begginer in Data science and I am working in Big market sale dataset using R.

Now when I do Data manipulation and adding "Outlet_year" columns from "Outlet_Establishment_Year".
then after combine "Outlet_Year" column with Main dataset.

So it should add one variable means only add 1 column name "Outlet_year" only but when I do this step then column added but also rows increasing and it reach 23590924.

How rows increasing I don't understand. Can any one please tell me whats wrong in it?

Thanks in Advance

Posts: 2

Participants: 2

Read full topic