Een .groupby()-instructie opzetten

De loonkloof tussen mannen en vrouwen is een veelbesproken onderwerp in de Verenigde Staten en wereldwijd. Met de gegevens van de volkstellingsenquête over inkomens, geladen als adult, wil je nagaan of sommige recent gepubliceerde cijfers overeenkomen met deze inkomensenquête.

Deze oefening maakt deel uit van de cursus

Werken met categorische data in Python

Cursus bekijken

Oefeninstructies

Splits de adult-gegevensset op de kolommen "Sex" en "Above/Below 50k", en sla dit object op als gb.
Print het aantal waarnemingen in elke groep.
Gebruik gb om het gemiddelde van elke numerieke kolom te berekenen.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

# Group the adult dataset by "Sex" and "Above/Below 50k"
gb = adult.____

# Print out how many rows are in each created group
print(____)

# Print out the mean of each group for all columns
print(____)

Code bewerken en uitvoeren

Deze oefening maakt deel uit van de cursus

Werken met categorische data in Python

SkillTag.level.intermediateSkillTag.label

4.8+

Begin de cursus gratis

Almost every dataset contains categorical information—and often it’s an unexplored goldmine of information. In this chapter, you’ll learn how pandas handles categorical columns using the data type category. You’ll also discover how to group data by categories to unearth great summary statistics.

Exercise 1: Introductie van de cursus Exercise 2: Categorisch vs. numeriek Exercise 3: Een doelvariabele verkennen Exercise 4: Ordinale categorische variabelen Exercise 5: Categorische gegevens in pandas Exercise 6: dtypes instellen en geheugen besparen Exercise 7: Een categorische pandas-Series maken Exercise 8: dtype instellen bij het inlezen van data Exercise 9: Gegevens groeperen op categorie in pandas Exercise 10: Maak heel veel groepen Exercise 11: Een .groupby()-instructie opzetten

Huidige oefening

Exercise 12: pandas-functies effectief gebruiken

Now it’s time to learn how to set, add, and remove categories from a Series. You’ll also explore how to update, rename, collapse, and reorder categories, before applying your new skills to clean and access other data within your DataFrame.

Exercise 1: Setting category variables Exercise 2: Setting categories Exercise 3: Adding categories Exercise 4: Removing categories Exercise 5: Updating categories Exercise 6: Collapsing categories knowledge check Exercise 7: Renaming categories Exercise 8: Collapsing categories Exercise 9: Reordering categories Exercise 10: Reordering categories in a Series Exercise 11: Using .groupby() after reordering Exercise 12: Cleaning and accessing data Exercise 13: Cleaning variables Exercise 14: Accessing and filtering data

In this chapter, you’ll use the seaborn Python library to create informative visualizations using categorical data—including categorical plots (cat-plot), box plots, bar plots, point plots, and count plots. You’ll then learn how to visualize categorical columns and split data across categorical columns to visualize summary statistics of numerical columns.

Exercise 1: Introduction to categorical plots using Seaborn Exercise 2: Boxplot understanding Exercise 3: Creating a box plot Exercise 4: Seaborn bar plots Exercise 5: Creating a bar plot Exercise 6: Ordering categories Exercise 7: Bar plot using hue Exercise 8: Point and count plots Exercise 9: Creating a point plot Exercise 10: Creating a count plot Exercise 11: Review catplot() types Exercise 12: Additional catplot() options Exercise 13: One visualization per group Exercise 14: Updating categorical plots

Lastly, you’ll learn how to overcome the common pitfalls of using categorical data. You’ll also grow your data encoding skills as you are introduced to label encoding and one-hot encoding—perfect for helping you prepare your data for use in machine learning algorithms.

Exercise 1: Categorical pitfalls Exercise 2: Memory usage knowledge check Exercise 3: Overcoming pitfalls: string issues Exercise 4: Overcoming pitfalls: using NumPy arrays Exercise 5: Label encoding Exercise 6: Create a label encoding and map Exercise 7: Using saved mappings Exercise 8: Creating a Boolean encoding Exercise 9: One-hot encoding Exercise 10: One-hot knowledge check Exercise 11: One-hot encoding specific columns Exercise 12: Wrap-up video