Calculate number of sites of a study

Trial concept calculated: number of the sites where the trial is conducted. EUCTR lacks information on number of sites outside of the EEA; for each non-EEA country mentioned, at least one site is assumed.

Usage

f.numSites(df = NULL)

Arguments

df

data frame such as from dbGetFieldsIntoDf. If `NULL`, prints fields needed in `df` for calculating this trial concept, which can be used with dbGetFieldsIntoDf.

Value

data frame with columns `_id` and `.numSites`, an integer.

Examples

# fields needed
f.numSites()
#> $euctr
#> [1] "e851_number_of_sites_anticipated_in_the_eea"
#> [2] "e863_trial_sites_planned_in"                
#> 
#> $ctgov
#> [1] "location.facility.address.city"
#> 
#> $ctgov2
#> [1] "protocolSection.contactsLocationsModule.locations.city"
#> 
#> $isrctn
#> [1] "participants.trialCentres.trialCentre.name"
#> 
#> $ctis
#> [1] "authorizedPartsII.trialSites.id"                      
#> [2] "authorizedApplication.authorizedPartsII.trialSites.id"
#> 

if (FALSE) { # \dontrun{

# apply trial concept when creating data frame
dbc <- nodbi::src_sqlite(
  dbname = system.file("extdata", "demo.sqlite", package = "ctrdata"),
  collection = "my_trials", flags = RSQLite::SQLITE_RO)
trialsDf <- dbGetFieldsIntoDf(
  calculate = "f.numSites",
  con = dbc)
} # }