R Markdown in RStudio Demo

Overview

• Quick demonstration of using R Markdown in RStudio
• Focus on creating and processing R Markdown documents

Getting Started

• Open a new R Markdown file in RStudio:
  • Go to menu and select R Markdown
  • Default output format is usually HTML (recommended)
  • Options for PDF or Microsoft Word may require additional tools
• Input document title and author (optional)

Creating a Document

• After creating the document, a pre-populated template appears
• Knit HTML Button: Click to generate HTML document from Markdown
  • Code is displayed in gray boxes
  • Outputs, including plots, are rendered in the HTML document

Basic Document Editing

• Remove boilerplate text after the preamble
• Save the document (e.g. as Markdown.demo.rmd)
• Begin writing custom text and code
• Example introductory text: "This is my first breakdown document."

Loading and Summarizing Data

• Use code block to write R code:
  • Open code block with three backticks (```) and specify r for R code
  • Load air quality dataset using data(airquality)
  • Summarize the dataset with summary(airquality)
• Knit the document to view results

Exploratory Data Analysis

• Visualizing the Data: Create a pairs plot (scatter plot matrix)
  • Code: pairs(airquality)
• Knit the document again to see the visualization

Modeling Data

• Fit a regression model:
  • Predict ozone based on solar radiation, wind, and temperature
  • Use code block with linear model:

    lm_ozone <- lm(Ozone ~ Solar.R + Wind + Temp, data = airquality)
    summary(lm_ozone)
    

• Knit the document to view model summary and coefficients

Additional Features in R Markdown

• Create unordered lists using asterisks or other delimiters
• Create ordered lists using numbers
• R Markdown integrates text with R code and outputs, facilitating data analysis reporting

Conclusion

• Encouragement to create and experiment with R Markdown in RStudio
• Combine text, code, and outputs in a single document for effective communication of analysis.