Introductory Slides for R - Statistics

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Starting a Session from a DirectoryWhen you have a directory containing an R icon with name .RData you can open asession using that workspace by double-clicking on that icon.To see the objects in that workspace type ls() or objects().When there are no objects the response is character(0).If you want to start with a clean (empty) workspace you can remove all those objectsby typing the command rm(list=ls()).If you want to keep every object except specific ones, say myobject and dataset.x,you would remove them by typing rm(myobject,dataset.x).5
Help in RIf you know the name of a data or function object you just type ?that.object.name.For example: ?rivers or ?medianIf you don’t know such object names you should open the web browser basedhelp facility in R by typing help.start()This web browser interface gives access to all R related in<strong>for</strong>mation.It has a search engine and provides entry via keywords or by topic such asBasics, Graphics, Mathematics, Programming, <strong>Statistics</strong>.The R Reference Manual has over 3000 pages documenting available functions,operators and data sets. Access it via the R tool bar −→ Help −→ Manuals−→ R Reference Manual or get it from the CRAN site under Manuals.6
Page 1 and 2: STAT 311Elements of Statistical Met
Page 3 and 4: Statistical Analysis PlatformFreely
Page 5: Workspaces and DirectoriesBy defaul
Page 9 and 10: Median ValueDescriptionCompute the
Page 11 and 12: Basic Usage of RWe can use R as an
Page 13 and 14: Functions Creating Vectors> 1:10[1]
Page 15 and 16: Data ModesWe saw that vectors can b
Page 17 and 18: Mode CoercionMixed mode elements in
Page 19 and 20: Matrices> mat mat # vertically pos
Page 21 and 22: Submatrices of Matrices> mat[1:3,1:
Page 23 and 24: Matrices via rbind> rmat rmat[,1]
Page 25 and 26: Custom FunctionsR can be extended b
Page 27 and 28: Another Way to Construct FunctionsW
Page 29 and 30: Using the NotePad or WordPad Editor
Page 31 and 32: Saving Objects outside the R Worksp
Page 33 and 34: Getting Data into R from ExcelGetti
Page 35 and 36: ListsLists allow more general forms
Page 37 and 38: Lists with Named Objects> b.list b
Page 39 and 40: Programming Control Tools: for loop
Page 41 and 42: Graphics in RSome people use R just
Page 43 and 44: Simple Command Line Graphics> hist(
Page 45 and 46: Text Annotated Graphicshist.rainier
Page 47 and 48: Math Annotated Graphicsplot.fun
Page 49 and 50: PackagesAside from your own extensi

Introductory Slides for R - Statistics

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