By William N. Venables, David M. Smith
This guide presents an creation to "R", a software program package deal for statistical computing and pics. R is loose software program, dispensed less than the GNU basic Public License. it may be used with GNU/Linux, Unix and Microsoft home windows.
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Extra resources for An Introduction to R
Would fit a five variate multiple regression with variables (presumably) from the data frame production, fit an additional model including a sixth regressor variable, and fit a variant on the model where the response had a square root transform applied. Note especially that if the data= argument is specified on the original call to the model fitting function, this information is passed on through the fitted model object to update() and its allies. ’ can also be used in other contexts, but with slightly different meaning.
The vector of names is in fact simply an attribute of the list like any other and may be handled as such. Other structures besides lists may, of course, similarly be given a names attribute also. 2 Constructing and modifying lists New lists may be formed from existing objects by the function list(). , name_m =object_m ) sets up a list Lst of m components using object 1, . . , object m for the components and giving them names as specified by the argument names, (which can be freely chosen). If these names are omitted, the components are numbered only.
2 Examining the distribution of a set of data Given a (univariate) set of data we can examine its distribution in a large number of ways. The simplest is to examine the numbers. Two slightly different summaries are given by summary and fivenum and a display of the numbers by stem (a “stem and leaf” plot). Chapter 8: Probability distributions > attach(faithful) > summary(eruptions) Min. 1st Qu. Median Mean 3rd Qu. 1000 > stem(eruptions) 34 Max. 100 The decimal point is 1 digit(s) to the left of the | 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 | | | | | | | | | | | | | | | | | | 070355555588 000022233333335577777777888822335777888 00002223378800035778 0002335578023578 00228 23 080 7 2337 250077 0000823577 2333335582225577 0000003357788888002233555577778 03335555778800233333555577778 02222335557780000000023333357778888 0000233357700000023578 00000022335800333 0370 A stem-and-leaf plot is like a histogram, and R has a function hist to plot histograms.