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Basic SPSS commands in R ?

3 messages · Christian Schulz, Ben Bolker, Thomas Lumley

Original
Christian Schulz
# 
Hello,
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'.
execute.

(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 .
FREQUENCIES
VARIABLES=X Y Z 
/ORDER ANALYSIS .

Thanks in advance 
regards,christian

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Ben Bolker
#
On Sat, 8 Sep 2001, C. Schulz wrote:

            

      
      
      
    

        
1. make your variable into a factor, then set the levels
(see ?factor, ?levels)

            

      
      
      
    

        
2. Look at ?split, ?tapply, ?table

            

      
      
      
    

        

      
      
    

        

  
    

      
      
    

  


  


      

    

    
2 days later

    

      
      

        


  

        

      Thomas Lumley
    

    

      
      #
    

  


  

      
On Sat, 8 Sep 2001, C. Schulz wrote:

        

            

      
      
      
    

        
x<-factor(x,labels=c("very good","good"))

            

      
      
      
    

        
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
by(Cars93,Cars93$Type,summary)

##summaries of weight, horsepower and engine size by US/Foreign origin
by(Cars93[,c("Weight","Horsepower","EngineSize")],Cars93$Origin,summary)

## 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

Thomas Lumley			Asst. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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