Data from Weeks & Williams example 2
Source
Weeks, David L. & Donald R. Williams (1964). A Note on the Determination of Connectedness in an N-Way Cross Classification. Technometrics, 6:3, 319-324. Table 3. http://dx.doi.org/10.1080/00401706.1964.10490188
Details
A dataframe with 3 treatment factors. The treatment combinations form 4 disconnected groups.
Note: This data is based on Table 3 of Weeks & Williams. The groups defined in the text are missing some combinations.
Examples
library(lfe)
cbind(data_weeks2,
.group=con_check(data_weeks2, ~f1 + f2 + f3))
#> f1 f2 f3 .group
#> 1 2 2 2 4
#> 2 4 2 2 4
#> 3 2 2 4 4
#> 4 4 2 4 4
#> 5 2 4 2 4
#> 6 4 4 2 4
#> 7 2 4 4 4
#> 8 4 4 4 4
#> 9 2 1 1 1
#> 10 2 1 3 1
#> 11 2 1 5 1
#> 12 2 3 1 1
#> 13 2 3 3 1
#> 14 2 3 5 1
#> 15 2 5 1 1
#> 16 2 5 3 1
#> 17 2 5 5 1
#> 18 4 1 1 1
#> 19 4 1 3 1
#> 20 4 1 5 1
#> 21 4 3 1 1
#> 22 4 3 3 1
#> 23 4 3 5 1
#> 24 4 5 1 1
#> 25 4 5 3 1
#> 26 4 5 5 1
#> 27 1 2 1 2
#> 28 1 2 3 2
#> 29 1 2 5 2
#> 30 1 4 1 2
#> 31 1 4 3 2
#> 32 1 4 5 2
#> 33 3 2 1 2
#> 34 3 2 3 2
#> 35 3 2 5 2
#> 36 3 4 1 2
#> 37 3 4 3 2
#> 38 3 4 5 2
#> 39 5 2 1 2
#> 40 5 2 3 2
#> 41 5 2 5 2
#> 42 5 4 1 2
#> 43 5 4 3 2
#> 44 5 4 5 2
#> 45 1 1 2 3
#> 46 1 1 4 3
#> 47 1 3 2 3
#> 48 1 3 4 3
#> 49 1 5 2 3
#> 50 1 5 4 3
#> 51 3 1 2 3
#> 52 3 1 4 3
#> 53 3 3 2 3
#> 54 3 3 4 3
#> 55 3 5 2 3
#> 56 3 5 4 3
#> 57 5 1 2 3
#> 58 5 1 4 3
#> 59 5 3 2 3
#> 60 5 3 4 3
#> 61 5 5 2 3
#> 62 5 5 4 3