[R] Basic SPSS commands in R ?
tlumley at u.washington.edu
Mon Sep 10 17:28:08 CEST 2001
On Sat, 8 Sep 2001, C. Schulz wrote:
> i'm newbie of R and think it is a really good alternative to SPSS.
> But i have more problems using elementary things comparable with using advanced methods.
> (1) How can i value label i.e the variable X in data.frame DATA
> with the labels ( 1=very good ) (2=good).
> spss syntax when DATA is in Spreadsheet is:
> value labels X
> 1 'very good'.
> 2 'good'.
> (2) How can i split the data set dependent from one variable and
> give a special output i.e. frequencies.
> spss syntax:
> SORT CASES BY countryg .
> SPLIT FILE
> LAYERED BY countryg .
> VARIABLES=X Y Z
> /ORDER ANALYSIS .
Various commands. The easiest is by(), tapply is more general
For example, looking at the Cars93 dataset in the MASS package:
library(MASS) #load the package
data(Cars93) #load the dataset
#summaries of all variables by type of car
##summaries of weight, horsepower and engine size by US/Foreign origin
## table of no. of cylinders by type for US and Foreign cars.
by(Cars93[,c("Cylinders","Type")], Cars93$Origin, table)
This also gives some more examples of factors (aka VALUE LABELS)
Thomas Lumley Asst. Professor, Biostatistics
tlumley at u.washington.edu University of Washington, Seattle
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