Parameter Estimation of the Delay in Report Distribution

dist_delay_report()is no longer under active development, switching to dist_delay is recommended.

dist_delay_report(date_repair, date_report, distribution = "lognormal")

Arguments

date_repair

a vector of class character or Date, in the format "yyyy-mm-dd", indicating the date of repair of a failed unit. Use NA for missing elements.

date_report

a vector of class character or Date, in the format "yyyy-mm-dd", indicating the date of report of a failed unit. Use NA for missing elements.

distribution

Supposed distribution of the random variable. Only "lognormal"is implemented.

Value

A named vector of estimated parameters for the specified distribution.

Details

This function introduces a delay random variable by calculating the time difference between the report and repair date for the sample units and afterwards estimates the parameter(s) of a supposed distribution, using maximum likelihood.

Examples

date_of_repair <- c(NA, "2014-09-15", "2015-07-04", "2015-04-10", NA,
                    NA, "2015-04-24", NA, "2015-04-25", "2015-04-24",
                    "2015-06-12", NA, "2015-05-04", NA, NA,
                    "2015-05-22", NA, "2015-09-17", NA, "2015-08-15",
                    "2015-11-26", NA, NA)

date_of_report <- c(NA, "2014-10-09", "2015-08-28", "2015-04-15", NA,
                    NA, "2015-05-16", NA, "2015-05-28", "2015-05-15",
                    "2015-07-11", NA, "2015-08-14", NA, NA,
                    "2015-06-05", NA, "2015-10-17", NA, "2015-08-21",
                    "2015-12-02", NA, NA)

params_delay_report  <- dist_delay_report(
  date_repair = date_of_repair,
  date_report = date_of_report,
  distribution = "lognormal"
)
#> Warning: `dist_delay_report()` was deprecated in weibulltools 2.0.0.
#> Please use `dist_delay()` instead.