KwickClips Python · 43 sec · free
When should you drop a whole column?
Short answer. When it is mostly empty, so it carries little information.
How do you fill a missing category, like a city?
With the most common value, the mode.
Choose wisely
| Missing | Action |
|---|---|
| Few rows | drop rows |
| Mostly empty | drop column |
| Numbers | fill mean |
| Categories | fill mode |
Remember
| Few gaps: drop |
| Many gaps in numbers: fill |
Should you drop missing data or fill it? It depends. Few rows missing, drop them. Column mostly empty, drop it. Numbers, fill the mean. Categories, fill the most common. Two rules. Few gaps, drop. Many gaps, fill.
This clip is from the full lesson: Handling Missing Values in Pandas — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 12 Artificial Intelligence (843)
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