R studio 无法识别我的变量？ 任何想法为什么？

Question

So I imported the file and saved it as Purity and its clearly imported. I tried t-test but it doesn't recognize my variables. I tried using the names function to retrieve the variable names and its exactly what I'm entering, V1 and V2. I also tried with Lab-1 and Lab-2. I also tried just using dataset=Purity, all to no avail.

I took a screenshot so as to show code and that data is in the studio, can anyone tell me why this is not working?

apologies if this is painfully obvious I was only introduced to R for stats last week and am still a beginner, also don't have much experience with programming in general. I have looked at other similar problems but just cant see why mine aren't being recognised and others are.

Answer 1

You've got 2 issues here:

1). You don't show how you imported the dataset but you need to either remove the first row or (better) name the columns correctly. I'm assuming you imported the data with read.table() . If so, then include the argument header = TRUE when you import the data.

2). You need to tell R where you want it to get Lab-1 and Lab-2 from.

with(Purity, t.test(Lab-1, Lab-2, paired = TRUE))

Answer 2

r is case sensitive. It looks like your script is using a lowercase 'v" when its an upper case "V" in your variable names.

The problem is in the way you have named your variable. r doesn't recognise the hyphen (-) as a legitimate part of a variable name. Try using underscore (_) instead.