Error in eval(predvars, data, env) : object 'cre' not found

> setwd("D:\\R data\\")
> Book1 <- read.table(file = "Book1.txt", header = TRUE)
> Book1
   cre gender
1   45   male
2   28   male
3   23   male
4   49   male
5   32   male
6   42   male
7   30   male
8   40   male
9   47   male
10  24   male
11  34 female
12  47 female
13  38 female
14  42 female
15  26 female
16  27 female
17  21 female
18  41 female
19  48 female
20  45 female
> t.test(cre~gender, var.eq =TRUE)
Error in eval(predvars, data, env) : object 'cre' not found

In your t-test function call, R isn't sure where to find your cre and gender vectors. These are in the Book1 data frame. To access a column in a data.frame in R, use the $ extract operator.

t.test(Book1$cre ~ Book1$gender, var.eq =TRUE)

For a nice intro into R for Data Science, check out Garrett and Hadley's book

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Thanks dear....
It was so helpful.....Although I am working with SPSS for a long period of time, R is new to me

regards

Dr.Yogesh Sharma

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An equivalent way of doing this to avoid specifying the data frame name multiple times is the data argument:

t.test(cre ~ gender, Book1, var.eq =TRUE)
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