rank() method and ranking methods in Pandas - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the rank() method do in pandas?

The rank() method assigns ranks to entries in a Series or DataFrame column based on their values. Smaller values get lower ranks, and ties can be handled in different ways.

beginner

Name two ranking methods available in pandas rank().

Two common ranking methods are:<br>1. average: assigns the average rank to tied values.<br>2. min: assigns the minimum rank to tied values.

intermediate

How does the method='first' option affect ranking in pandas?

The method='first' option ranks tied values in the order they appear in the data, giving earlier entries a lower rank.

beginner

What does the ascending=False parameter do in rank()?

Setting ascending=False ranks the highest values with rank 1, reversing the default order where smallest values get rank 1.

intermediate

Explain the difference between method='min' and method='max' in pandas ranking.

method='min' assigns the lowest rank to all tied values.<br>method='max' assigns the highest rank to all tied values.

What rank will the smallest value get by default in pandas rank()?

A Rank equal to its value

B Rank 0

C Rank equal to its index

D Rank 1

By default, the smallest value gets rank 1 in pandas rank().

Which rank() method assigns the average rank to tied values?

A average

B min

C max

D first

The average method assigns the average rank to tied values.

If you want to rank values so that the largest value gets rank 1, which parameter should you use?

A method='min'

B ascending=True

C ascending=False

D method='first'

Use ascending=False to rank largest values with rank 1.

What does method='first' do when ranking tied values?

A Ranks tied values in order of appearance

B Assigns the minimum rank

C Assigns the average rank

D Assigns the maximum rank

method='first' ranks tied values by their order in the data.

Which ranking method assigns the highest rank to all tied values?

A min

B max

C average

D dense

method='max' assigns the highest rank to tied values.

Describe how the pandas rank() method works and list the main ranking methods it supports.

Think about how ties are handled and what rank numbers mean.

Explain how changing the ascending parameter affects the ranking order in pandas rank().

Consider what happens if you want the biggest number to be ranked first.