diff --git a/01_the_r_environment.qmd b/01_the_r_environment.qmd
index c232137..8646de7 100644
--- a/01_the_r_environment.qmd
+++ b/01_the_r_environment.qmd
@@ -1,12 +1,16 @@
-# The **[R]{.sans-serif}** *Environment*
+# The R *Environment*
**[R]{.sans-serif}** is an environment for statistical
-modeling and graphics. The word *environment* instead of *package* is one of
-the main reasons **[R]{.sans-serif}** is distinct from other statistical
-programs. A *package* only gives us a fixed set of tools. An *environment*
+modeling and graphics. That it is an *environment* instead of a *package* is one of the main reasons **[R]{.sans-serif}** is distinct from other statistical
+programs. A package only gives us a fixed set of tools. An environment
allows us to modify, combine and even create tools to suit our specific needs.
-## Why becoming a use**[R]{.sans-serif}**?
+## Why becoming a useR?
+
+### Price (\$0) and availability
+
+**[R]{.sans-serif}** is free---as in "no money required"---and it runs on
+Windows, MacOS, and several Unix platforms.
### Easy and cool graphics
@@ -39,20 +43,21 @@ full-fledged programming language that allows users to write their own
functions. Also, all of **[R]{.sans-serif}**'s code is open source, which means
that everyone can examine it and contribute to it. So, users constantly publish
their own "packages" (ready-to-use tools), which expand **[R]{.sans-serif}**'s
-base capabilities.
-
-As of March 2019, users have contributed over 13,700 packages to Comprehensive **[R]{.sans-serif}** Archive Network (CRAN). Many of these packages
-are for complex statistical routines that are not (and may never be) available
-in other statistical software systems.
+base capabilities. As of March 2019, users have contributed over 13,700 packages
+to Comprehensive **[R]{.sans-serif}** Archive Network (CRAN). Many of these
+packages perform complex statistical routines that are not (and may never be)
+available in other statistical software systems.
### Flexible interfaces
-**[R]{.sans-serif}** runs on Windows, MacOS, and a variety of Unix platforms. In
-Windows, there are several ways to use **[R]{.sans-serif}**. The standard **[R]{.sans-serif}** graphical unit interface (GUI) allows you to point and click to do many basic tasks. Another GUI is [**[R]{.sans-serif}** Commander](https://socialsciences.mcmaster.ca/jfox/Misc/Rcmdr/), developed by John Fox
-at McMaster University. **[R]{.sans-serif}** Commander displays the underlying
-**[R]{.sans-serif}** code for each analysis to help the user learn the
-programming language. [Tinn-**[R]{.sans-serif}**](http://sourceforge.net/projects/tinn-r/) is another GUI from Jose
-Claudio Faria.
+In Windows, there are several ways to use **[R]{.sans-serif}**. The standard
+**[R]{.sans-serif}** graphical unit interface (GUI) allows you to point and
+click to do many basic tasks. Another GUI is [**[R]{.sans-serif}**
+Commander](https://socialsciences.mcmaster.ca/jfox/Misc/Rcmdr/), developed by
+John Fox at McMaster University. **[R]{.sans-serif}** Commander displays the
+underlying **[R]{.sans-serif}** code for each analysis to help the user learn
+the programming language. [Tinn-**[R]{.sans-serif}**](http://sourceforge.net/projects/tinn-r/) is another
+GUI from Jose Claudio Faria.
These GUIs are friendly and easy to grasp if you're a beginner. But to use all of **[R]{.sans-serif}**'s capabilities you will need to do more than point and click.
@@ -60,8 +65,7 @@ A more complete way of using **[R]{.sans-serif}** is through an integrated devel
user's screen into panes that display scripts, objects, graphics, and
the **[R]{.sans-serif}** console.
-In these notes, we will use the standard **[R]{.sans-serif}** GUI a little and
-**[R]{.sans-serif}**Studio a lot. The goal is for you to start using **[R]{.sans-serif}** to its full potential.
+In these notes, we will use **[R]{.sans-serif}**Studio a lot. The goal is for you to start taking full advantage of **[R]{.sans-serif}**'s capabilities.
-### Price (\$0)
-
-**[R]{.sans-serif}** is free, as in "you don't have to give money to get
-it".
-
## Why Isn't Everyone a Use**[R]{.sans-serif}**?
### One and Only
@@ -107,8 +106,8 @@ But don't get frustrated! You don't have to be an expert programmer to use
the code. You won't break **[R]{.sans-serif}**. You'll see many examples in
this workshop but there is much more online.
- Don't worry about getting errors. Experienced **[R]{.sans-serif}** users
- make errors all the time. Base **[R]{.sans-serif}** has excellent error
- messages that are good learning opportunities themselves.
+ make errors all the time. Besides, you can learn a lot from error
+ messages.
- Some useful links are:
-
R is an environment for statistical modeling and graphics. That it is an environment instead of a package is one of the main reasons R is distinct from other statistical programs. A package only gives us a fixed set of tools. An environment allows us to modify, combine and even create tools to suit our specific needs.
R is free—as in “no money required”—and it runs on Windows, MacOS, and several Unix platforms.
+With R, you can make basic scatter plots or histograms with one or two lines of code (assuming your data has a nice format). And you can use the “grammar of graphics” to make incremental changes: add custom colors, change the size of the plot or its contents, or arrange several graphics in grids.
R offers many powerful tools to fit statistical models (both bayesian and frequentist), including:
New tools become available in R all the time. R is a full-fledged programming language that allows users to write their own functions. Also, all of R’s code is open source, which means that everyone can examine it and contribute to it. So, users constantly publish their own “packages” (ready-to-use tools), which expand R’s base capabilities.
-As of March 2019, users have contributed over 13,700 packages to Comprehensive R Archive Network (CRAN). Many of these packages are for complex statistical routines that are not (and may never be) available in other statistical software systems.
+New tools become available in R all the time. R is a full-fledged programming language that allows users to write their own functions. Also, all of R’s code is open source, which means that everyone can examine it and contribute to it. So, users constantly publish their own “packages” (ready-to-use tools), which expand R’s base capabilities. As of March 2019, users have contributed over 13,700 packages to Comprehensive R Archive Network (CRAN). Many of these packages perform complex statistical routines that are not (and may never be) available in other statistical software systems.
R runs on Windows, MacOS, and a variety of Unix platforms. In Windows, there are several ways to use R. The standard R graphical unit interface (GUI) allows you to point and click to do many basic tasks. Another GUI is R Commander, developed by John Fox at McMaster University. R Commander displays the underlying R code for each analysis to help the user learn the programming language. Tinn-R is another GUI from Jose Claudio Faria.
+In Windows, there are several ways to use R. The standard R graphical unit interface (GUI) allows you to point and click to do many basic tasks. Another GUI is R Commander, developed by John Fox at McMaster University. R Commander displays the underlying R code for each analysis to help the user learn the programming language. Tinn-R is another GUI from Jose Claudio Faria.
These GUIs are friendly and easy to grasp if you’re a beginner. But to use all of R’s capabilities you will need to do more than point and click.
A more complete way of using R is through an integrated development environment (IDE), which, in short, helps you code. The most popular IDE for R is RStudio, which organizes the user’s screen into panes that display scripts, objects, graphics, and the R console.
-In these notes, we will use the standard R GUI a little and RStudio a lot. The goal is for you to start using R to its full potential.
+In these notes, we will use RStudio a lot. The goal is for you to start taking full advantage of R’s capabilities.
R is free, as in “you don’t have to give money to get it”.
-