schwab/exploratorydata

Exploratory data analysis final

Exploratory Data Final

• Data plots for the Exploratory Data Analysis Class
• The code in this repo assumes that the data files "summarySCC_PM25.rds" and "Source_Classification_Code.rds" are in the current working directory. These files were sourced from https://d396qusza40orc.cloudfront.net/exdata%2Fdata%2FNEI_data.zip

Each plot does the following

• Provides an appropriately named R file
• Provides a plot in png format
• Includes code for reading the data so that the plot can be fully reproduced

Plot 1 answers the question :

• Have total emissions from PM2.5 decreased in the United States from 1999 to 2008?
• Uses the base plotting system
• Shows the total PM2.5 emission from all sources for each of the years 1999, 2002, 2005, and 2008

Plot 2 answers the question :

• Have total emissions from PM2.5 decreased in the Baltimore City, Maryland (fips == "24510") from 1999 to 2008?

Plot 3 answers the question :

• Of the four types of sources indicated by the type (point, nonpoint, onroad, nonroad) variable, which of these four sources have seen decreases in emissions from 1999–2008 for Baltimore City?
• Which have seen increases in emissions from 1999–2008?

Plot 4 answers the question :

• Across the United States, how have emissions from coal combustion-related sources changed from 1999–2008?

Plot 5 answers the question :

• How have emissions from motor vehicle sources changed from 1999–2008 in Baltimore City?

Plot 6 answers the question :

• Compare emissions from motor vehicle sources in Baltimore City with emissions from motor vehicle sources in Los Angeles County, California (fips == "06037"). Which city has seen greater changes over time in motor vehicle emissions?