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

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

Dec 09, 2023 334 likes •683 views

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

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Making a scatter plot

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

Hillary Green-Lerman

Lead Data Scientist, Looker

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INTRODUCTION TO DATA SCIENCE IN PYTHON

Mapping Cell Phone Signals

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What is a scatter plot?

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What is a scatter plot?

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Creating a scatter plot

plt.scatter(df.age, df.height) plt.xlabel('Age (in months)') plt.ylabel('Height (in inches)') plt.show()

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Keyword arguments

plt.scatter(df.age, df.height, color='green', marker='s')

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Changing marker transparency

plt.scatter(df.x_data, df.y_data, alpha=0.1)

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Let's practice

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

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Making a bar chart

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

Hillary Green-Lerman

Lead Data Scientist, Looker

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INTRODUCTION TO DATA SCIENCE IN PYTHON

Comparing pet crimes

precinct pets_abducted Farmburg 10 Cityville 15 Suburbia 9

plt.bar(df.precinct, df.pets_abducted) plt.ylabel('Pet Abductions') plt.show()

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Horizontal bar charts

plt.barh(df.precinct, df.pets_abducted) plt.ylabel('Pet Abductions') plt.show()

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Adding error bars

plt.bar(df.precinct, df.pet_abductions, yerr=df.error) plt.ylabel('Pet Abductions') plt.show()

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Stacked bar charts

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INTRODUCTION TO DATA SCIENCE IN PYTHON

Stacked bar charts

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INTRODUCTION TO DATA SCIENCE IN PYTHON

Stacked bar charts

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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()

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Let's practice

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

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Making a histogram

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

Hillary Green-Lerman

Lead Data Scientist, Looker

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INTRODUCTION TO DATA SCIENCE IN PYTHON

Tracking down the kidnapper

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What is a histogram?

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Histograms with matplotlib

plt.hist(gravel.mass) plt.show()

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Changing bins

plt.hist(data, bins=nbins) plt.hist(gravel.mass, bins=40)

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Changing range

plt.hist(data, range=(xmin, xmax)) plt.hist(gravel.mass, range=(50, 100))

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Normalizing

Unnormalized bar plot

plt.hist(male_weight) plt.hist(female_weight)

Sum of bar area = 1

plt.hist(male_weight, density=True) plt.hist(female_weight, density=True)

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Let's practice

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

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Recap of the rescue

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

Hillary Green-Lerman

Lead Data Scientist, Looker

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You did it!

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Modules and variables

Modules group functions together Add a module using import

import happens at the

beginning of a script le Variables store data: strings

  • r oats

import pandas as pd import numpy as np

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Using functions

Perform a task Positional arguments Keyword arguments

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Working with tabular data

import pandas as pd

DataFrames store tabular data Inspect data using .head()

  • r .info()

Select rows using logic

credit_reports[ credit_report.suspect == 'Freddy Frequentist']

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Creating line plots

from matplotlib import pyplot as plt

Use plt.plot() to create a line plot Modify line plots with keyword arguments Add labels and legends

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More plot types

plt.scatter() shows

individual data points

plt.bar() creates bar

charts

plt.hist() visualizes

distributions

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Great job!

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