Inspect observations per subject

Inspect observation counts and observation-time balance across subjects.

Usage

check.tdmm.subject.balance(data, subject.var = "subject.ID", time.var = "time")

Arguments

data

Data frame with one row per observation.

subject.var

Subject ID column name.

time.var

Numeric observation-time column name.

Value

A diagnostic list describing observation-count and observation-time balance.

Examples

d <- data.frame(subject.ID = rep(1:3, each = 3), time = rep(1:3, 3))
check.tdmm.subject.balance(d)
#> $n.subject
#> [1] 3
#> 
#> $min.obs.per.subject
#> [1] 3
#> 
#> $max.obs.per.subject
#> [1] 3
#> 
#> $mean.obs.per.subject
#> [1] 3
#> 
#> $obs.per.subject
#> 
#> 1 2 3 
#> 3 3 3 
#> 
#> $balanced
#> [1] TRUE
#> 
#> $common.time.grid
#> [1] TRUE
#> 
#> $time.grid
#> [1] 1 2 3
#> 
#> $time.by.subject
#> $time.by.subject$`1`
#> [1] 1 2 3
#> 
#> $time.by.subject$`2`
#> [1] 1 2 3
#> 
#> $time.by.subject$`3`
#> [1] 1 2 3
#> 
#>