plot.CopulaCenR: Plotting for CopulaCenR fits

In CopulaCenR: Copula-Based Regression Models for Multivariate Censored Data

Plotting for CopulaCenR fits

Description

Plotting for CopulaCenR fits from ic_spTran_copula, rc_spCox_copula, ic_par_copula and rc_par_copula.

Usage

## S3 method for class 'CopulaCenR'
plot(
  x,
  y,
  class = "joint",
  newdata,
  evalPoints = 50,
  evalTimes1 = NULL,
  evalTimes2 = NULL,
  plot_margin = 1,
  cond_time = NULL,
  cond_margin = 2,
  type = "l",
  xlab = "years",
  ylab = "survival probability",
  cex.main = 1.4,
  cex.lab = 1.4,
  cex.axis = 1.4,
  legend = TRUE,
  ...
)

Arguments

x	an object of ic_spTran_copula or rc_spCox_copula or ic_par_copula or rc_par_copula
y	new data frame with colname names id, ind and covariate
class	one of "joint", "conditional" or "marginal"
newdata	new data frame (ignored if y is included)
evalPoints	number of time points to be evaluated in both margins; default is 50
evalTimes1	a vector of times for margin 1 to be evaluated; default is NULL; will override evalPoints if non-NULL
evalTimes2	a vector of times for margin 2 to be evaluated
plot_margin	for class = "marginal" only; indicator of which margin to plot (either 1 or 2); default is 1 for margin 1
cond_time	for class = "conditional" only; the time by which event has occurred in the margin indicated by cond_margin; must be smaller than the largest observed time
cond_margin	for class = "conditional" only; indicator of the margin where event has occurred (either 1 or 2); default is 2 for margin 2
type	type of plot with default type = "l".
xlab	a title for the x axis.
ylab	a title for the x axis.
cex.main	cex for main.
cex.lab	cex for lab.
cex.axis	cex for axis.
legend	whether to show legend with default legend = TRUE.
...	further arguments

Details

y must be a data frame with columns id (subject id), ind (1,2 for two margins) and covariates.
The argument class determines the plot: "joint" for joint survival probabilities, "conditional" for conditional probabilities and "marginal" for marginal probabilities.

The function evaluates on a series of time points (given by evalPoints or evalTimes; evalTimes will override evalPoints). By default, the time points are automatically selected by specifying the number of points (evalPoints = 50). Users can also provide the specific time points through evalTimes1 and evalTimes2 for the two margins, respectively. When class = "conditional", only evalTimes1 is needed and the evaluation times are actually evalTimes1 plus cond_time.

If class = "conditional", one needs to specify the margin that has the event (by cond_margin) and time when the event has occurred (by cond_time). For example, if cond_margin = 2 and cond_time = 5, then the function produces the conditional survival probability (after time 5) in margin 1 given that margin 2 has got an event by time 5. This measurement is useful for predicting the second event given the first event has occurred. See the example for details.

If class = "marginal", one needs to specify which margin to plot through the argument plot_margin. See the example for details.

Value

a 3D joint survival distribution plot if class = "joint"; a 2D survival distribution plot if class = "marginal" or "conditional".

Examples

data(AREDS)
# fit a Copula2-Sieve model
copula2_sp <- ic_spTran_copula(data = AREDS, copula = "Copula2",
              l = 0, u = 15, m = 3, r = 3,
              var_list = c("ENROLLAGE","rs2284665","SevScaleBL"))
newdata = data.frame(id = rep(1, each=2), ind = rep(c(1,2),1),
                     SevScaleBL = rep(3,2), ENROLLAGE = rep(60,2),
                     rs2284665 = c(0,0))
# Plot joint survival probabilities
plot(x = copula2_sp, class = "joint", newdata = newdata)

# Plot conditional survival probabilities
plot(x = copula2_sp, class = "conditional", newdata = newdata,
     cond_margin = 2, cond_time = 5, ylim = c(0.25,1),
     ylab = "Conditional Survival Probability")

# Plot marginal survival probabilities
plot(x = copula2_sp, class = "marginal", newdata = newdata,
     plot_margin = 1, ylim = c(0.6,1),
     ylab = "Marginal Survival Probability")

CopulaCenR documentation built on April 3, 2025, 10:29 p.m.