daDoctoR/R/plot_biv_olr.R
2019-12-03 14:52:17 +01:00

76 lines
2.5 KiB
R

#' Forrest plot from ordinal logistic regression, version2 of plot_ord_ords().
#'
#' Heavily inspired by https://www.r-bloggers.com/plotting-odds-ratios-aka-a-forrestplot-with-ggplot2/
#' @param meas outcome meassure variable name or response in data-data.frame as a string. Should be factor, preferably ordered.
#' @param vars variables to compare against. As vector of columnnames.
#' @param data dataframe of data.
#' @param title plot title
#' @param dec decimals for labels
#' @param lbls labels for variable names. Carefull, as the right order is not checked automatically!
#' @param hori labels the horizontal axis (this i the y axis as the plot is rotated)
#' @param vert labels the horizontal axis (this i the x axis as the plot is rotated)
#' @param short flag to half number of ticks on horizontal axis.
#' @param analysis can be either "biv", or "multi", for creation of forest plot from either bivariate (unadjusted) or multivariate (adjusted) ordinal logistic regression.
#' @keywords forestplot
#' @export
plot_biv_olr<-function(meas,vars,data, title = NULL,dec=3,lbls=NULL,hori="OR (95 % CI)",vert="Variables",short=FALSE,analysis=c("biv","multi")){
require(ggplot2)
d <- data
x <- data.frame(d[, c(ad)])
y <- d[, c(meas)]
if (analysis=="biv"){
dt <- cbind(y, x)
odds<-c(matrix(ncol = 3))
nms<-c("or","lo","hi")
for (i in 1:ncol(x)) {
dat <- data.frame(y = y, x[, i])
m <- polr(y ~ ., data = dat, Hess = TRUE)
mat<-suppressMessages(matrix(c(exp(coef(m)), exp(confint(m))),ncol=3,byrow=FALSE))
colnames(mat)<-nms
odd <- data.frame(mat)
odds<-rbind(odds,odd)
}
odds<-odds[-1,]
}
if (analysis=="multi"){
m<-polr(y~.,data = dta2,Hess = TRUE)
odds<-data.frame(cbind(exp(coef(m)), exp(confint(m))))
}
names(odds)<-c("or", "lo", "up")
rodds<-round(odds,digits = dec)
if (!is.null(lbls)){
odds$vars<-paste0(lbls," \n",paste0(rodds$or," [",rodds$lo,":",rodds$up,"]"))
}
else {
odds$vars<-paste0(row.names(odds)," \n",paste0(rodds$or," [",rodds$lo,":",rodds$up,"]"))
}
ticks<-c(seq(0, 1, by =.1), seq(1, 10, by =1), seq(10, 100, by =10))
if (short==TRUE){
ticks<-ticks[seq(1, length(ticks), 2)]
}
else {ticks<-ticks}
odds$ord<-c(nrow(odds):1)
ggplot(odds, aes(y= or, x = reorder(vars,ord))) +
geom_point() +
geom_errorbar(aes(ymin=lo, ymax=up), width=.2) +
scale_y_log10(breaks=ticks, labels = ticks) +
geom_hline(yintercept = 1, linetype=2) +
coord_flip() +
labs(title = title, x = vert, y = hori) +
theme_bw()
}