Hi,
For your error "object 't1971' not found" can be corrected
by subsetting.
t2001 can be done similarly with 2001 replacing 1971.
> t1971 <- data[year==1971,]
> t1971
VOT year Consonant
1 67 1971 k
2 127 1971 k
3 79 1971 k
4 150 1971 k
5 53 1971 k
6 65 1971 k
7 75 1971 k
8 109 1971 k
9 109 1971 t
10 126 1971 t
11 129 1971 t
12 119 1971 t
13 104 1971 t
14 153 1971 t
15 124 1971 t
16 107 1971 t
17 181 1971 t
18 166 1971 t
--
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