We will write our Markdown files using RStudio's editor. Markdown files can be written using any plain text editor such as notepad. As you gain experience with R Markdown, you will knit much less frequently. As you start working with R Markdown, you may find it convenient to knit your document often. The examples and exercises in this article series are designed to give you the practice and experience needed to be comfortable with this type of document creation process. Writing R Markdown documents is a little different process than with "What You See Is What You Get" (WYSIWYG) editors, such as Microsoft Word. In this article series we will generate HTML files. pdf files are widely available at no cost. We recommend knitting to either pdf or HTML files. We do not recommend knitting to Word, because a Word document is a form that is tempting to edit. Any edits that are made by hand will be lost when the document is knit again. The knitted documents should not be changed by hand. R Markdown files can be knit to html, pdf, or Word documents. These steps are done together for you by simply pushing the knit button in RStudio. The second step uses the Markdown formatting commands to format the final document. The results of the R commands are incorporated with the text and Markdown commands from the. In the first step, the R commands are run. RStudio creates a document, this is called knitting, from an. This results in not only greater efficiency, but also fewer errors in documents. There is no more going back through documents trying to find every thing that needs to be fixed when an analysis is rerun. Any changes that occur in either your data set or the analysis are automatically updated in your document the next time the document is created. Incorporating R results directly into your documents is an important step in reproducible research. This allow you write documents which integrate results from your analysis. R Markdown adds a few features which include R code and results in the formatted document. Markdown is a good choice to format most documents. The source files are also easier to read than LaTeX or HTML. This small set of features supports the most commonly used formatting. Markdown's formatting commands are simpler than most other formatting languages, such as LaTeX or HTML, because it has a smaller number of features. md, contain text and formatting commands. Markdown is a tool used to create formatted documents. This can be very helpful in determining why results have changed. Git diff allows you to look at what has changed in a file, or files, between any two saved project states. These features make R Markdown documents easy to write and the process less error prone. This set of features supports the most commonly used formatting, resulting in the ability to create most documents. This ease is a result of R Markdown only using a small set of features and this reduces the complexity of the needed commands. The second advantage is it is incredibly easy to use. The first is it allows the results of R code to be directly inserted into formatted documents. R Markdown has two advantages that are of interest to a researcher. These tools are part of RStudio's development environment. This article will introduce you to R Markdown, a document writing program, and demonstrates using RStudio's Git diff, a tool to examine when prior changes were made to a project.
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