mmcif_pd_univariate function

Computes Marginal Measures for One Observation

Computes the marginal cumulative incidence functions (CIF), marginal survival function or the derivative of the CIF.

mmcif_pd_univariate(
  par,
  object,
  newdata,
  cause,
  time,
  left_trunc = NULL,
  ghq_data = object$ghq_data,
  strata = NULL,
  use_log = FALSE,
  type = "cumulative"
)

Arguments

• par: numeric vector with the model parameters.

• object: an object from mmcif_data.

• newdata: a data.frame with data for the observation. It needs to have one row.

• cause: an integer vector with the cause of each outcome. If there are n_causes of outcome, then the vector should have values in 1:(n_causes + 1) with n_causes + 1 indicating censoring.

• time: a numeric vector with the observed times.

• left_trunc: numeric vector with left-truncation times. NULL

  implies that there are not any individuals with left-truncation.

• ghq_data: the Gauss-Hermite quadrature nodes and weights to use. It should be a list with two elements called "node"

  and "weight". A default is provided if NULL is passed.

• strata: an integer vector or a factor vector with the strata of each individual. NULL implies that there are no strata.

• use_log: a logical for whether the returned output should be on the log scale.

• type: a character for the type of measures for the observation. It can have value "derivative" for the derivative of a CIF or "cumulative" for a CIF or the survival probability.

Returns

A numeric scalar with the requested quantity.

Examples

if(require(mets)){
  data(prt)

  # truncate the time
  max_time <- 90
  prt <- within(prt, {
    status[time >= max_time] <- 0
    time <- pmin(time, max_time)
  })

  # select the DZ twins and re-code the status
  prt_use <- subset(prt, zyg == "DZ") |>
    transform(status = ifelse(status == 0, 3L, status))

  # Gauss Hermite quadrature nodes and weights from fastGHQuad::gaussHermiteData
  ghq_data <- list(
    node = c(-3.43615911883774, -2.53273167423279, -1.75668364929988, -1.03661082978951,
             -0.342901327223705, 0.342901327223705, 1.03661082978951, 1.75668364929988,
             2.53273167423279, 3.43615911883774),
    weight = c(7.6404328552326e-06, 0.00134364574678124, 0.0338743944554811, 0.240138611082314,
               0.610862633735326,0.610862633735326, 0.240138611082315, 0.033874394455481,
               0.00134364574678124, 7.64043285523265e-06))

  # setup the object for the computation
  mmcif_obj <- mmcif_data(
    ~ country - 1, prt_use, status, time, id, max_time,
    2L, strata = country, ghq_data = ghq_data)

  # previous estimates
  par <- c(0.727279974859164, 0.640534073288067, 0.429437766165371, 0.434367104339573,
           -2.4737847536253, -1.49576564624673, -1.89966050143904, -1.58881346649412,
           -5.5431198001029, -3.5328359024178, -5.82305147022587, -3.4531896212114,
           -5.29132887832377, -3.36106297109548, -6.03690322125729, -3.49516746825624,
           2.55000711185704, 2.71995985605891, 2.61971498736444, 3.05976391058032,
           -5.97173564860957, -3.37912051983482, -5.14324860374941, -3.36396780694965,
           -6.02337246348561, -3.03754644968859, -5.51267338700737, -3.01148582224673,
           2.69665543753264, 2.59359057553995, 2.7938341786374, 2.70689750644755,
           -0.362056555418564, 0.24088005091276, 0.124070380635372, -0.246152029808377,
           -0.0445628476462479, -0.911485513197845, -0.27911988106887, -0.359648419277058,
           -0.242711959678559, -6.84897302527358)

  # the test data we will use
  test_dat <- data.frame(country = factor("Norway", levels(prt_use$country)),
                         status = 2L)

  # compute the CIF
  mmcif_pd_univariate(
    par = par, object = mmcif_obj, newdata = test_dat, cause = status,
    strata = country, ghq_data = ghq_data, time = 75, type = "cumulative") |>
    print()

  # compute the derivative of the CIF
  mmcif_pd_univariate(
    par = par, object = mmcif_obj, newdata = test_dat, cause = status,
    strata = country, ghq_data = ghq_data, time = 75, type = "derivative") |>
    print()

  # compute the survival probability
  mmcif_pd_univariate(
    par = par, object = mmcif_obj, newdata = test_dat, cause = 3L,
    strata = country, ghq_data = ghq_data, time = 75, type = "cumulative") |>
    print()
}

See Also

mmcif_pd_bivariate and mmcif_pd_cond.