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Sample from a jointdata x

Source: R/sample.jointdata.R
sample.jointdata.Rd

Generic function used to sampling a subset of data from an x of class jointdata, with a specific size of number of subjects.

Usage

sample.jointdata(x, size, replace = FALSE)

Arguments

x

an object of class jointdata.

size

number of subjects to include in the sampled subset.

replace

should sampling be with replacement? Default is replace = TRUE.

Value

An object of class jointdata, with data only on the subjects sampled.

See also

sample, jointdata, UniqueVariables.

Author

Ines Sousa

Examples

data(heart.valve)
heart.surv <- UniqueVariables(heart.valve,
                              var.col = c("fuyrs", "status"),
                              id.col = "num")
heart.valve.jd <- jointdata(survival = heart.surv,
                            id.col = "num",
                            time.col = "time")
sample.jointdata(heart.valve.jd, size = 10)
#> $subject
#>  [1]  16  32  33  43  57  87 107 143 212 219
#> 
#> $longitudinal
#> [1] NA
#> 
#> $survival
#>    num    fuyrs status
#> 1   16 3.191781      0
#> 2   32 7.884932      0
#> 3   33 4.210959      0
#> 4   43 4.356164      0
#> 5   57 7.465753      0
#> 6   87 6.854795      1
#> 7  107 6.641096      0
#> 8  143 5.424658      1
#> 9  212 2.928767      0
#> 10 219 1.726027      0
#> 
#> $baseline
#> [1] NA
#> 
#> $time.col
#> [1] NA
#> 
#> $subj.col
#> [1] "num"
#> 
#> attr(,"class")
#> [1] "jointdata" "list"