Alternative pivoting method for easily pivoting based on name pattern
Source:R/wide2long.R
wide2long.RdThis function requires and assumes a systematic naming of variables. For now only supports one level pivoting. Adding more levels would require an added "ignore" string pattern or similarly. Example 2.
Usage
wide2long(
data,
pattern,
type = c("prefix", "infix", "suffix"),
id.col = 1,
instance.name = "instance"
)Examples
data.frame(
1:20, sample(70:80, 20, TRUE),
sample(70:100, 20, TRUE),
sample(70:100, 20, TRUE),
sample(170:200, 20, TRUE)
) |>
setNames(c("id", "age", "weight_0", "weight_1", "height_1")) |>
wide2long(pattern = c("_0", "_1"), type = "suffix")
#> id age instance weight height
#> 1 1 70 0 73 NA
#> 2 1 NA 1 77 176
#> 3 2 77 0 97 NA
#> 4 2 NA 1 75 180
#> 5 3 78 0 70 NA
#> 6 3 NA 1 99 181
#> 7 4 78 0 87 NA
#> 8 4 NA 1 74 198
#> 9 5 73 0 81 NA
#> 10 5 NA 1 98 198
#> 11 6 72 0 90 NA
#> 12 6 NA 1 73 178
#> 13 7 72 0 71 NA
#> 14 7 NA 1 100 179
#> 15 8 79 0 96 NA
#> 16 8 NA 1 74 177
#> 17 9 77 0 88 NA
#> 18 9 NA 1 98 189
#> 19 10 78 0 88 NA
#> 20 10 NA 1 85 181
#> 21 11 79 0 83 NA
#> 22 11 NA 1 97 197
#> 23 12 76 0 79 NA
#> 24 12 NA 1 94 186
#> 25 13 74 0 77 NA
#> 26 13 NA 1 77 200
#> 27 14 70 0 88 NA
#> 28 14 NA 1 100 181
#> 29 15 72 0 95 NA
#> 30 15 NA 1 73 175
#> 31 16 70 0 99 NA
#> 32 16 NA 1 83 185
#> 33 17 80 0 71 NA
#> 34 17 NA 1 84 174
#> 35 18 79 0 77 NA
#> 36 18 NA 1 94 184
#> 37 19 72 0 70 NA
#> 38 19 NA 1 93 195
#> 39 20 77 0 77 NA
#> 40 20 NA 1 77 187
data.frame(
1:20, sample(70:80, 20, TRUE),
sample(70:100, 20, TRUE),
sample(70:100, 20, TRUE),
sample(170:200, 20, TRUE)
) |>
setNames(c("id", "age", "weight_0", "weight_a_1", "height_b_1")) |>
wide2long(pattern = c("_0", "_1"), type = "suffix")
#> id age instance weight weight_a height_b
#> 1 1 77 0 84 NA NA
#> 2 1 NA 1 NA 78 171
#> 3 2 70 0 89 NA NA
#> 4 2 NA 1 NA 72 182
#> 5 3 72 0 98 NA NA
#> 6 3 NA 1 NA 93 170
#> 7 4 73 0 100 NA NA
#> 8 4 NA 1 NA 98 171
#> 9 5 73 0 83 NA NA
#> 10 5 NA 1 NA 91 173
#> 11 6 72 0 81 NA NA
#> 12 6 NA 1 NA 81 170
#> 13 7 76 0 88 NA NA
#> 14 7 NA 1 NA 75 174
#> 15 8 74 0 70 NA NA
#> 16 8 NA 1 NA 82 173
#> 17 9 76 0 87 NA NA
#> 18 9 NA 1 NA 84 176
#> 19 10 71 0 85 NA NA
#> 20 10 NA 1 NA 70 189
#> 21 11 77 0 79 NA NA
#> 22 11 NA 1 NA 83 185
#> 23 12 74 0 87 NA NA
#> 24 12 NA 1 NA 77 187
#> 25 13 71 0 75 NA NA
#> 26 13 NA 1 NA 89 173
#> 27 14 75 0 70 NA NA
#> 28 14 NA 1 NA 84 178
#> 29 15 80 0 93 NA NA
#> 30 15 NA 1 NA 87 182
#> 31 16 76 0 96 NA NA
#> 32 16 NA 1 NA 72 187
#> 33 17 71 0 88 NA NA
#> 34 17 NA 1 NA 80 173
#> 35 18 73 0 86 NA NA
#> 36 18 NA 1 NA 91 184
#> 37 19 76 0 91 NA NA
#> 38 19 NA 1 NA 89 189
#> 39 20 71 0 79 NA NA
#> 40 20 NA 1 NA 84 197
# Optional filling of missing values by last observation carried forward
# Needed for mmrm analyses
long_missings |>
# Fills record ID assuming none are missing
tidyr::fill(record_id) |>
# Grouping by ID for the last step
dplyr::group_by(record_id) |>
# Filling missing data by ID
tidyr::fill(names(long_missings)[!names(long_missings) %in% new_names]) |>
# Remove grouping
dplyr::ungroup()
#> Error: object 'long_missings' not found