[R] Two sample t-test

[Claire_6700]

Hi,

I want to perform t-test in R for each individual car. Here is what i have.
Is there a way i can test each car?


The original table (test.csv)

Car	Tester2	Tester2	Controller1	Controller2
Audi	0.56	0.9	0.5	0.9
Toyota	0.2	0.9	0.9	0.2
Honda	0.5	0.9	0.1	0.5
BMW	0.2	0.3	0.5	0.7


> cars<-read.table("c://test.csv",header=T,sep=",",
+ skip=2,comment.char="")
> cars
  Toyota X0.2 X0.9 X0.9.1 X0.2.1
1  Honda  0.5  0.9    0.1    0.5
2    BMW  0.2  0.3    0.5    0.7
> head(cars)
  Toyota X0.2 X0.9 X0.9.1 X0.2.1
1  Honda  0.5  0.9    0.1    0.5
2    BMW  0.2  0.3    0.5    0.7

why is R only showing two cars when i type head?

many thanks.
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