Functional Form of Continuous Variable in Cox Proportional Hazards Model
Description
Displays graphs of continuous explanatory variable against martingale residuals of null
cox proportional hazards model, for each term in of the right side of formula
. This might help to properly
choose the functional form of continuous variable in cox model (coxph). Fitted lines with lowess function
should be linear to satisfy cox proportional hazards model assumptions.
Usage
1 2 3 4 5 6 7 8 9  ggcoxfunctional(formula, data, iter = 0, f = 0.6, point.col = "red",
point.size = 1, point.shape = 19, point.alpha = 1, font.main = c(16,
"plain", "black"), font.x = c(14, "plain", "black"), font.y = c(14,
"plain", "black"), font.tickslab = c(12, "plain", "black"), xlim = NULL,
ylim = NULL, ylab = "Martingale Residuals \nof Null Cox Model",
ggtheme = theme_classic2())
## S3 method for class 'ggcoxfunctional'
print(x, ...)

Arguments
formula 
a formula object, with the response on the left of a ~ operator, and the terms on the right. The response must be a survival object as returned by the Surv function. 
data 
a 
iter 
parameter of lowess. 
f 
parameter of lowess. 
point.col, point.size, point.shape, point.alpha 
color, size, shape and visibility to be used for points. 
font.main, font.x, font.y, font.tickslab 
a vector of length 3 indicating respectively the size (e.g.: 14), the style (e.g.: "plain", "bold", "italic", "bold.italic") and the color (e.g.: "red") of main title, xlab and ylab and axis tick labels, respectively. For example font.x = c(14, "bold", "red"). Use font.x = 14, to change only font size; or use font.x = "bold", to change only font face. 
xlim, ylim 
x and y axis limits e.g. xlim = c(0, 1000), ylim = c(0, 1). 
ylab 
y axis label. 
ggtheme 
function, ggplot2 theme name. Default value is theme_classic2.
Allowed values include ggplot2 official themes: see 
x 
an object of class ggcoxfunctional 
... 
further arguments passed to print, but really it's unused 
Value
Returns an object of class ggcoxfunctional
which is a list of ggplots.
Functions

ggcoxfunctional
: Functional Form of Continuous Variable in Cox Proportional Hazards Model.
Author(s)
Marcin Kosinski , m.p.kosinski@gmail.com
Examples
1 2 3 4 5 