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Introduction to R R is available at the following website: You can download R by clicking on the “Down Load” link. We will demonstrate this later in this video.
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PROGRAMMING IN R
Introduction to R
Introduction to R
In this session I will:•Introduce you to the R program and windows•Show how to install R •Write basic programs in R
Introduction to R• R is available at the following
website:http://www.r-project.org/
• You can download R by clicking on the “Down Load” link.
• We will demonstrate this later in this video.
Introduction to R• There is an introduction to R
available on the CRAN R-project website.
http://cran.r-project.org/doc/manuals/R-intro.pdf• I recommend downloading this
document and getting acquainted with it.
Introduction to R
•R is an environment for statistical computing, data analysis, and graphics•We will use R for describing and analyzing data•Being proficient in using R for statistical computing and analysis a skill that is highly valued in multiple arenas
R Environment
• R is an extremely capable environment.• The differences between R and SAS are too enumerable to describe. •R is similar to the S language developed at Bell Laboratories. •R can be challenging to learn but practice will make it easier.
R Environment• There are three basic components
to the R environment or R console.
• R Commands window or Prompt– executes the commands.
• Script Window – a program editor provided by R.
• Graphics Window – an output window that displays graphics.
R Environment• R is an expression language• It is case sensitive
– A and a are two different symbols– Refer to different variables.
• Elementary commands consist of either expressions or assignments.
R Environment• Expressions
– Given as a command, is evaluated, printed, and the value is lost.
• Assignments– Evaluates the expression and passes
the value to a variable – The result is not printed.
R Environment• The R environment also has many
different ways to store data.• R is an object oriented language
so everything is stored as an object.
• In this session, we will define the various types of objects but we will only use 2 of these types.
R variables. • There are different types of
objects or ways to store variables.• Vectors• Lists• Functions• For now, we will only work with
Vectors.
Introduction to R• Let’s install R.