Data Science-3 ETL - GitHub Pages
Data Science in the Wild
Lecture 3: ETL - Extract, Transform, Load
Eran Toch
Data Science in the Wild, Spring 2019
!1
The Data Science Model
Ask question
Data Engineering
World's Data
Data Science in the Wild, Spring 2019
Experiment Learn Analyze
Visualize Understand
Write
Report
Operationalize
System
!2
ETL Pipeline
Extract
Transform & Clean
Load
Data Science in the Wild, Spring 2019
Sources
DW !3
ETL: Practical Considerations
? Typically, ETL takes 80% of the development time in a DW project (Vassiliadis et al.).
? ETL is particularly difficult to generalize beyond one data science task ? Why?
Data Science in the Wild, Spring 2019
!4
Agenda
1.ETL Processes 2. Pandas 3.Cleaning datasets 4.Handling missing data 5.Handling outliers 6.Understanding data sources
Data Science in the Wild, Spring 2019
!5
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