Derive First or Last Datetime from Multiple Sources

The derive_var_extreme_dtm() function has been superseded in favor of derive_vars_extreme_event().

Add the first or last datetime from multiple sources to the dataset, e.g., the last known alive datetime (LSTALVDTM).

Usage

derive_var_extreme_dtm(
  dataset,
  new_var,
  ...,
  source_datasets,
  mode,
  subject_keys = get_admiral_option("subject_keys")
)

Arguments

dataset

Input dataset

The variables specified by the subject_keys argument are expected to be in the dataset.

new_var

Name of variable to create

...

Source(s) of dates. One or more date_source() objects are expected.

source_datasets

A named list containing datasets in which to search for the first or last date

mode

Selection mode (first or last)

If "first" is specified, the first date for each subject is selected. If "last" is specified, the last date for each subject is selected.

Permitted Values: "first", "last"

subject_keys

Variables to uniquely identify a subject

A list of expressions where the expressions are symbols as returned by exprs() is expected.

Value

The input dataset with the new variable added.

Details

The following steps are performed to create the output dataset:

For each source dataset the observations as specified by the filter element are selected and observations where date is NA are removed. Then for each patient the first or last observation (with respect to date and mode) is selected.
The new variable is set to the variable or expression specified by the date element. If this is a date variable (rather than datetime), then the time is imputed as "00:00:00".
The variables specified by the set_values_to element are added.
The selected observations of all source datasets are combined into a single dataset.
For each patient the first or last observation (with respect to the new variable and mode) from the single dataset is selected and the new variable is merged to the input dataset.

Examples

library(dplyr, warn.conflicts = FALSE)
library(lubridate)
dm <- tribble(
  ~STUDYID,  ~DOMAIN,  ~USUBJID, ~AGE,   ~AGEU,
  "PILOT01",    "DM", "01-1130",   84, "YEARS",
  "PILOT01",    "DM", "01-1133",   81, "YEARS",
  "PILOT01",    "DM", "01-1211",   76, "YEARS",
  "PILOT01",    "DM", "09-1081",   86, "YEARS",
  "PILOT01",    "DM", "09-1088",   69, "YEARS"
)
ae <- tribble(
  ~STUDYID,  ~DOMAIN,  ~USUBJID, ~AESEQ,     ~AESTDTC,     ~AEENDTC,
  "PILOT01",    "AE", "01-1130",      5, "2014-05-09", "2014-05-09",
  "PILOT01",    "AE", "01-1130",      6, "2014-05-22",           NA,
  "PILOT01",    "AE", "01-1130",      4, "2014-05-09", "2014-05-09",
  "PILOT01",    "AE", "01-1130",      8, "2014-05-22",           NA,
  "PILOT01",    "AE", "01-1130",      7, "2014-05-22",           NA,
  "PILOT01",    "AE", "01-1130",      2, "2014-03-09", "2014-03-09",
  "PILOT01",    "AE", "01-1130",      1, "2014-03-09", "2014-03-16",
  "PILOT01",    "AE", "01-1130",      3, "2014-03-09", "2014-03-16",
  "PILOT01",    "AE", "01-1133",      1, "2012-12-27",           NA,
  "PILOT01",    "AE", "01-1133",      3, "2012-12-27",           NA,
  "PILOT01",    "AE", "01-1133",      2, "2012-12-27",           NA,
  "PILOT01",    "AE", "01-1133",      4, "2012-12-27",           NA,
  "PILOT01",    "AE", "01-1211",      5, "2012-11-29",           NA,
  "PILOT01",    "AE", "01-1211",      1, "2012-11-16",           NA,
  "PILOT01",    "AE", "01-1211",      7, "2013-01-11",           NA,
  "PILOT01",    "AE", "01-1211",      8, "2013-01-11",           NA,
  "PILOT01",    "AE", "01-1211",      4, "2012-11-22",           NA,
  "PILOT01",    "AE", "01-1211",      2, "2012-11-21", "2012-11-21",
  "PILOT01",    "AE", "01-1211",      3, "2012-11-21",           NA,
  "PILOT01",    "AE", "01-1211",      6, "2012-12-09",           NA,
  "PILOT01",    "AE", "01-1211",      9, "2013-01-14", "2013-01-14",
  "PILOT01",    "AE", "09-1081",      2, "2014-05-01",           NA,
  "PILOT01",    "AE", "09-1081",      1, "2014-04-07",           NA,
  "PILOT01",    "AE", "09-1088",      1, "2014-05-08",           NA,
  "PILOT01",    "AE", "09-1088",      2, "2014-08-02",           NA
)
lb <- tribble(
  ~STUDYID,  ~DOMAIN,  ~USUBJID, ~LBSEQ,             ~LBDTC,
  "PILOT01",    "LB", "01-1130",    219, "2014-06-07T13:20",
  "PILOT01",    "LB", "01-1130",    322, "2014-08-16T13:10",
  "PILOT01",    "LB", "01-1133",    268, "2013-04-18T15:30",
  "PILOT01",    "LB", "01-1133",    304, "2013-04-29T10:13",
  "PILOT01",    "LB", "01-1211",      8, "2012-10-30T14:26",
  "PILOT01",    "LB", "01-1211",    162, "2013-01-08T12:13",
  "PILOT01",    "LB", "09-1081",     47, "2014-02-01T10:55",
  "PILOT01",    "LB", "09-1081",    219, "2014-05-10T11:15",
  "PILOT01",    "LB", "09-1088",    283, "2014-09-27T12:13",
  "PILOT01",    "LB", "09-1088",    322, "2014-10-09T13:25"
)
adsl <- tribble(
  ~STUDYID,   ~USUBJID,              ~TRTEDTM,
  "PILOT01", "01-1130", "2014-08-16 23:59:59",
  "PILOT01", "01-1133", "2013-04-28 23:59:59",
  "PILOT01", "01-1211", "2013-01-12 23:59:59",
  "PILOT01", "09-1081", "2014-04-27 23:59:59",
  "PILOT01", "09-1088", "2014-10-09 23:59:59"
) %>%
  mutate(
    TRTEDTM = as_datetime(TRTEDTM)
  )

# derive last known alive datetime (LSTALVDTM)
ae_start <- date_source(
  dataset_name = "ae",
  date = convert_dtc_to_dtm(AESTDTC, highest_imputation = "M"),
)
ae_end <- date_source(
  dataset_name = "ae",
  date = convert_dtc_to_dtm(AEENDTC, highest_imputation = "M"),
)

ae_ext <- ae %>%
  derive_vars_dtm(
    dtc = AESTDTC,
    new_vars_prefix = "AEST",
    highest_imputation = "M"
  ) %>%
  derive_vars_dtm(
    dtc = AEENDTC,
    new_vars_prefix = "AEEN",
    highest_imputation = "M"
  )

lb_date <- date_source(
  dataset_name = "lb",
  date = convert_dtc_to_dtm(LBDTC),
)

lb_ext <- derive_vars_dtm(
  lb,
  dtc = LBDTC,
  new_vars_prefix = "LB"
)

adsl_date <- date_source(
  dataset_name = "adsl",
  date = TRTEDTM
)

dm %>%
  derive_var_extreme_dtm(
    new_var = LSTALVDTM,
    ae_start, ae_end, lb_date, adsl_date,
    source_datasets = list(
      adsl = adsl,
      ae = ae_ext,
      lb = lb_ext
    ),
    mode = "last"
  ) %>%
  select(USUBJID, LSTALVDTM)
#> # A tibble: 5 × 2
#>   USUBJID LSTALVDTM          
#>   <chr>   <dttm>             
#> 1 01-1130 2014-08-16 23:59:59
#> 2 01-1133 2013-04-29 10:13:00
#> 3 01-1211 2013-01-14 00:00:00
#> 4 09-1081 2014-05-10 11:15:00
#> 5 09-1088 2014-10-09 23:59:59

# derive last alive datetime and traceability variables
ae_start <- date_source(
  dataset_name = "ae",
  date = convert_dtc_to_dtm(AESTDTC, highest_imputation = "M"),
  set_values_to = exprs(
    LALVDOM = "AE",
    LALVSEQ = AESEQ,
    LALVVAR = "AESTDTC"
  )
)

ae_end <- date_source(
  dataset_name = "ae",
  date = convert_dtc_to_dtm(AEENDTC, highest_imputation = "M"),
  set_values_to = exprs(
    LALVDOM = "AE",
    LALVSEQ = AESEQ,
    LALVVAR = "AEENDTC"
  )
)
lb_date <- date_source(
  dataset_name = "lb",
  date = convert_dtc_to_dtm(LBDTC),
  set_values_to = exprs(
    LALVDOM = "LB",
    LALVSEQ = LBSEQ,
    LALVVAR = "LBDTC"
  )
)

adsl_date <- date_source(
  dataset_name = "adsl",
  date = TRTEDTM,
  set_values_to = exprs(
    LALVDOM = "ADSL",
    LALVSEQ = NA_integer_,
    LALVVAR = "TRTEDTM"
  )
)

dm %>%
  derive_var_extreme_dtm(
    new_var = LSTALVDTM,
    ae_start, ae_end, lb_date, adsl_date,
    source_datasets = list(
      adsl = adsl,
      ae = ae_ext,
      lb = lb_ext
    ),
    mode = "last"
  ) %>%
  select(USUBJID, LSTALVDTM, LALVDOM, LALVSEQ, LALVVAR)
#> # A tibble: 5 × 5
#>   USUBJID LSTALVDTM           LALVDOM LALVSEQ LALVVAR
#>   <chr>   <dttm>              <chr>     <dbl> <chr>  
#> 1 01-1130 2014-08-16 23:59:59 ADSL         NA TRTEDTM
#> 2 01-1133 2013-04-29 10:13:00 LB          304 LBDTC  
#> 3 01-1211 2013-01-14 00:00:00 AE            9 AEENDTC
#> 4 09-1081 2014-05-10 11:15:00 LB          219 LBDTC  
#> 5 09-1088 2014-10-09 23:59:59 ADSL         NA TRTEDTM

Usage

Arguments

Value

Details

See also

Examples