Making a scatter plot IN TR OD U C TION TO DATA SC IE N C E IN P - PowerPoint PPT Presentation

Making a scatter plot IN TR OD U C TION TO DATA SC IE N C E IN P YTH ON Hillar y Green - Lerman Lead Data Scientist , Looker

Mapping Cell Phone Signals INTRODUCTION TO DATA SCIENCE IN PYTHON

What is a scatter plot ? INTRODUCTION TO DATA SCIENCE IN PYTHON

What is a scatter plot ? INTRODUCTION TO DATA SCIENCE IN PYTHON

Creating a scatter plot plt.scatter(df.age, df.height) plt.xlabel('Age (in months)') plt.ylabel('Height (in inches)') plt.show() INTRODUCTION TO DATA SCIENCE IN PYTHON

Ke yw ord arg u ments plt.scatter(df.age, df.height, color='green', marker='s') INTRODUCTION TO DATA SCIENCE IN PYTHON

Changing marker transparenc y plt.scatter(df.x_data, df.y_data, alpha=0.1) INTRODUCTION TO DATA SCIENCE IN PYTHON

Let ' s practice IN TR OD U C TION TO DATA SC IE N C E IN P YTH ON

Making a bar chart IN TR OD U C TION TO DATA SC IE N C E IN P YTH ON Hillar y Green - Lerman Lead Data Scientist , Looker

Comparing pet crimes plt.bar(df.precinct, precinct pets _ abd u cted df.pets_abducted) Farmb u rg 10 plt.ylabel('Pet Abductions') plt.show() Cit yv ille 15 S u b u rbia 9 INTRODUCTION TO DATA SCIENCE IN PYTHON

Hori z ontal bar charts plt.barh(df.precinct, df.pets_abducted) plt.ylabel('Pet Abductions') plt.show() INTRODUCTION TO DATA SCIENCE IN PYTHON

Adding error bars plt.bar(df.precinct, df.pet_abductions, yerr=df.error) plt.ylabel('Pet Abductions') plt.show() INTRODUCTION TO DATA SCIENCE IN PYTHON

Stacked bar charts INTRODUCTION TO DATA SCIENCE IN PYTHON

Stacked bar charts INTRODUCTION TO DATA SCIENCE IN PYTHON

Stacked bar charts INTRODUCTION TO DATA SCIENCE IN PYTHON

Stacked bar charts plt.bar(df.precinct, df.dog, label='Dog') plt.bar(df.precinct, df.cat, bottom=df.dog, label='Cat') plt.legend() plt.show() INTRODUCTION TO DATA SCIENCE IN PYTHON

Let ' s practice IN TR OD U C TION TO DATA SC IE N C E IN P YTH ON

Making a histogram IN TR OD U C TION TO DATA SC IE N C E IN P YTH ON Hillar y Green - Lerman Lead Data Scientist , Looker

Tracking do w n the kidnapper INTRODUCTION TO DATA SCIENCE IN PYTHON

What is a histogram ? INTRODUCTION TO DATA SCIENCE IN PYTHON

Histograms w ith matplotlib plt.hist(gravel.mass) plt.show() INTRODUCTION TO DATA SCIENCE IN PYTHON

Changing bins plt.hist(data, bins=nbins) plt.hist(gravel.mass, bins=40) INTRODUCTION TO DATA SCIENCE IN PYTHON

Changing range plt.hist(data, range=(xmin, xmax)) plt.hist(gravel.mass, range=(50, 100)) INTRODUCTION TO DATA SCIENCE IN PYTHON

Normali z ing Unnormali z ed bar plot S u m of bar area = 1 plt.hist(male_weight) plt.hist(male_weight, density=True) plt.hist(female_weight) plt.hist(female_weight, density=True) INTRODUCTION TO DATA SCIENCE IN PYTHON

Let ' s practice IN TR OD U C TION TO DATA SC IE N C E IN P YTH ON

Recap of the resc u e IN TR OD U C TION TO DATA SC IE N C E IN P YTH ON Hillar y Green - Lerman Lead Data Scientist , Looker

Yo u did it ! INTRODUCTION TO DATA SCIENCE IN PYTHON

Mod u les and v ariables import pandas as pd Mod u les gro u p f u nctions import numpy as np together Add a mod u le u sing import import happens at the beginning of a script � le Variables store data : strings or � oats INTRODUCTION TO DATA SCIENCE IN PYTHON

Using f u nctions Perform a task Positional arg u ments Ke yw ord arg u ments INTRODUCTION TO DATA SCIENCE IN PYTHON

Working w ith tab u lar data import pandas as pd DataFrames store tab u lar data Inspect data u sing .head() or .info() Select ro w s u sing logic credit_reports[ credit_report.suspect == 'Freddy Frequentist'] INTRODUCTION TO DATA SCIENCE IN PYTHON

Creating line plots from matplotlib import pyplot as plt Use plt.plot() to create a line plot Modif y line plots w ith ke yw ord arg u ments Add labels and legends INTRODUCTION TO DATA SCIENCE IN PYTHON

More plot t y pes plt.scatter() sho w s indi v id u al data points plt.bar() creates bar charts plt.hist() v is u ali z es distrib u tions INTRODUCTION TO DATA SCIENCE IN PYTHON

Great job ! IN TR OD U C TION TO DATA SC IE N C E IN P YTH ON