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DESCRIPTION
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Package: cornet
Version: 0.0.0
Version: 0.0.1
Title: Elastic Net for Dichotomised Outcomes
Description: Implements lasso and ridge regression for dichotomised outcomes.
Depends: R (>= 3.0.0)
Imports: glmnet
Suggests: knitr, testthat, RColorBrewer
Suggests: knitr, testthat
Enhances: RColorBrewer
Authors@R: person("Armin","Rauschenberger",email="a.rauschenberger@vumc.nl",role=c("aut","cre"))
VignetteBuilder: knitr
License: GPL-3
......
R/functions.R
View file @ 55267e0c
......@@ -2,6 +2,7 @@
#--- Workhorse function --------------------------------------------------------
#' @export
#' @aliases cornet-package
#' @title
#' Logistic regression with a continuous response
#'
......@@ -57,10 +58,29 @@
#' further arguments passed to \code{\link[glmnet]{glmnet}}
#'
#' @details
#' - INCLUDE note on deviance (not comparable between lin and log models)
#' - alpha: elastic net parameter\strong{:}
#' numeric between \eqn{0} (ridge) and \eqn{1} (lasso)
#' - do not use "family"
#' This function fits a \code{"gaussian"} model for the numeric response,
#' and a \code{"binomial"} model for the binary response,
#' meaning that the \code{glmnet} argument \code{family} is unavailable.
#' Also if \code{type.measure} equals \code{"deviance"},
#' the loss is uncomparable between linear and logistic regression.
#'
#' @return
#' Returns an object of class \code{cornet}, a list with multiple slots:
#' \itemize{
#' \item \code{"gaussian"}: fitted linear model, class \code{glmnet}
#' \item \code{"binomial"}: fitted logistic model, class \code{glmnet}
#' \item \code{"sigma"}: scaling parameters \code{sigma},
#' vector of length \code{nsigma}
#' \item \code{"pi"}: weighting parameters \code{pi},
#' vector of length \code{npi}
#' \item \code{cvm}: evaluation loss,
#' matrix with \code{nsigma} rows and \code{npi} columns
#' \item \code{sigma.min}: optimal scaling parameter,
#' positive scalar
#' \item \code{pi.min}: optimal weighting parameter,
#' scalar in unit interval
#' \item \code{cutoff}: threshold for dichotomisation
#' }
#'
#' @examples
#' n <- 100; p <- 200
......@@ -68,14 +88,11 @@
#' X <- matrix(rnorm(n*p),nrow=n,ncol=p)
#' net <- cornet(y=y,cutoff=0,X=X)
#'
#' ### Add ... to all glmnet::glmnet calls !!! ###
#'
cornet <- function(y,cutoff,X,alpha=1,npi=101,pi=NULL,nsigma=99,sigma=NULL,nfolds=10,foldid=NULL,type.measure="deviance",...){
#--- temporary ---
# cutoff <- 0; npi <- 101; pi <- NULL; nsigma <- 99; sigma <- NULL; nfolds <- 10; foldid <- NULL; type.measure <- "deviance"; logistic <- TRUE
test <- list()
test$sigma <- test$pi <- FALSE
test$combined <- TRUE
#--- checks ---
......@@ -105,8 +122,8 @@ cornet <- function(y,cutoff,X,alpha=1,npi=101,pi=NULL,nsigma=99,sigma=NULL,nfold
#--- model fitting ---
fit <- list()
fit$gaussian <- glmnet::glmnet(y=y,x=X,family="gaussian",alpha=alpha)
fit$binomial <- glmnet::glmnet(y=z,x=X,family="binomial",alpha=alpha)
fit$gaussian <- glmnet::glmnet(y=y,x=X,family="gaussian",alpha=alpha,...)
fit$binomial <- glmnet::glmnet(y=z,x=X,family="binomial",alpha=alpha,...)
#--- sigma sequence ---
if(is.null(sigma)){
......@@ -136,12 +153,6 @@ cornet <- function(y,cutoff,X,alpha=1,npi=101,pi=NULL,nsigma=99,sigma=NULL,nfold
pred$y <- matrix(data=NA,nrow=n,ncol=length(fit$gaussian$lambda))
pred$z <- matrix(data=NA,nrow=n,ncol=length(fit$binomial$lambda))
if(test$sigma){
pred$sigma <- matrix(data=NA,nrow=n,ncol=nsigma)
}
if(test$pi){
pred$pi <- matrix(data=NA,nrow=n,ncol=npi)
}
if(test$combined){
dimnames <- list(NULL,lab.sigma,lab.pi)
pred$combined <- array(data=NA,dim=c(n,nsigma,npi),dimnames=dimnames)
......@@ -157,35 +168,20 @@ cornet <- function(y,cutoff,X,alpha=1,npi=101,pi=NULL,nsigma=99,sigma=NULL,nfold
X1 <- X[foldid==k,,drop=FALSE]
# linear regression
net <- glmnet::glmnet(y=y0,x=X0,family="gaussian",alpha=alpha)
net <- glmnet::glmnet(y=y0,x=X0,family="gaussian",alpha=alpha,...)
temp_y <- stats::predict(object=net,newx=X1,type="response",s=fit$gaussian$lambda)
pred$y[foldid==k,seq_len(ncol(temp_y))] <- temp_y
cvm <- cornet:::.loss(y=y1,fit=temp_y,family="gaussian",type.measure="deviance")[[1]]
y_hat <- temp_y[,which.min(cvm)]
# logistic regression
net <- glmnet::glmnet(y=z0,x=X0,family="binomial",alpha=alpha)
net <- glmnet::glmnet(y=z0,x=X0,family="binomial",alpha=alpha,...)
temp_z <- stats::predict(object=net,newx=X1,type="response",s=fit$binomial$lambda)
pred$z[foldid==k,seq_len(ncol(temp_z))] <- temp_z
cvm <- cornet:::.loss(y=z1,fit=temp_z,family="binomial",type.measure=type.measure)[[1]]
z_hat <- temp_z[,which.min(cvm)]
# fusion (sigma)
if(test$sigma){
for(i in seq_along(fit$sigma)){
#pred$sigma[foldid==k,i] <- stats::pnorm(q=y_hat,mean=cutoff,sd=fit$sigma[i])
}
}
# fusion (pi)
if(test$pi){
for(i in seq_along(fit$pi)){
#cont <- stats::pnorm(q=y_hat,mean=cutoff,sd=stats::sd(y))
#pred$pi[foldid==k,i] <- fit$pi[i]*cont + (1-fit$pi[i])*z_hat
}
}
# fusion (combined)
# combined regression
if(test$combined){
for(i in seq_along(fit$sigma)){
for(j in seq_along(fit$pi)){
......@@ -194,27 +190,20 @@ cornet <- function(y,cutoff,X,alpha=1,npi=101,pi=NULL,nsigma=99,sigma=NULL,nfold
}
}
}
}
#--- evaluation ---
# deviance (not comparable between Gaussian and binomial families)
# linear loss
fit$gaussian$cvm <- cornet:::.loss(y=y,fit=pred$y,family="gaussian",type.measure="deviance")[[1]]
fit$gaussian$lambda.min <- fit$gaussian$lambda[which.min(fit$gaussian$cvm)]
# logistic loss
fit$binomial$cvm <- cornet:::.loss(y=z,fit=pred$z,family="binomial",type.measure=type.measure)[[1]]
fit$binomial$lambda.min <- fit$binomial$lambda[which.min(fit$binomial$cvm)]
if(test$sigma){
#fit$sigma.cvm <- cornet:::.loss(y=z,fit=pred$sigma,family="binomial",type.measure=type.measure)[[1]]
#fit$sigma.min1 <- fit$sigma[which.min(fit$sigma.cvm)]
}
if(test$pi){
#fit$pi.cvm <- cornet:::.loss(y=z,fit=pred$pi,family="binomial",type.measure=type.measure)[[1]] # trial
#fit$pi.min1 <- fit$pi[which.min(fit$pi.cvm)]
}
# combined loss
if(test$combined){
dimnames <- list(lab.sigma,lab.pi)
fit$cvm <- matrix(data=NA,nrow=nsigma,ncol=npi,dimnames=dimnames)
......@@ -306,7 +295,7 @@ plot.cornet <- function(x,...){
k <- 100
levels <- stats::quantile(x$cvm,probs=seq(from=0,to=1,length.out=k+1))
## RColorBrewer
# colours
if("RColorBrewer" %in% .packages(all.available=TRUE)){
pal <- rev(c("white",RColorBrewer::brewer.pal(n=9,name="Blues")))
col <- grDevices::colorRampPalette(colors=pal)(k)
......@@ -390,7 +379,7 @@ predict.cornet <- function(object,newx,type="probability",...){
.check(x=newx,type="matrix")
.check(x=type,type="string",values=c("probability","odds","log-odds"))
# linear, logistic and mixed
# linear and logistic
prob <- list()
link <- as.numeric(stats::predict(object=x$gaussian,
newx=newx,s=x$gaussian$lambda.min,type="response"))
......@@ -398,14 +387,7 @@ predict.cornet <- function(object,newx,type="probability",...){
prob$binomial <- as.numeric(stats::predict(object=x$binomial,
newx=newx,s=x$binomial$lambda.min,type="response"))
if(test$sigma){
#prob$sigma <- stats::pnorm(q=link,mean=x$cutoff,sd=x$sigma.min)
}
if(test$pi){
#prob$pi <- x$pi.min*prob$gaussian + (1-x$pi.min)*prob$binomial
}
# combined
if(test$combined){
cont <- stats::pnorm(q=link,mean=x$cutoff,sd=x$sigma.min)
prob$combined <- x$pi.min*cont + (1-x$pi.min)*prob$binomial
......@@ -433,7 +415,7 @@ predict.cornet <- function(object,newx,type="probability",...){
#' @export
#' @title
#' Comparison
#' Performance measurement by cross-validation
#'
#' @description
#' Compares models for a continuous response with a cutoff value.
......@@ -492,18 +474,6 @@ predict.cornet <- function(object,newx,type="probability",...){
# residual increase/decrease
loss$resid.factor <- stats::median((rys-rxs)/rxs)
if(FALSE){# tests
# equality deviance
loss$deviance["binomial"]==mean(res[,"binomial"])
loss$deviance["combined"]==mean(res[,"combined"])
# percentage decrease
#range((rys-rxs)/rxs)
stats::median((rys-rxs)/rxs)
mean((rys-rxs)/rxs)
(sum(rys)-sum(rxs))/sum(rxs)
(loss$deviance["combined"]-loss$deviance["binomial"])/loss$deviance["binomial"]
}
# paired test for each fold
loss$resid.pvalue <- numeric()
for(i in seq_len(nfolds)){
......@@ -569,17 +539,6 @@ predict.cornet <- function(object,newx,type="probability",...){
return(list(y=y,X=X))
}
#--- start trial ---
if(FALSE){
n <- 1000
y_hat <- runif(n)
y <- y_hat > 0.9
y <- rbinom(n=n,size=1,prob=0.5)
foldid <- rep(1:10,length.out=n)
.loss(y=y,fit=y_hat,family="binomial",type.measure="auc",foldid=foldid)
}
#--- end trial ---
#--- Internal functions --------------------------------------------------------
#' @title
......@@ -685,8 +644,7 @@ if(FALSE){
return(invisible(NULL))
}
# Correct this function in the palasso package (search twice for "# typo").
# Import this function from the palasso package.
.loss <- function (y,fit,family,type.measure,foldid=NULL){
if (!is.list(fit)) {
fit <- list(fit)
......@@ -810,44 +768,3 @@ if(FALSE){
}
return(foldid)
}
#--- Lost and found ------------------------------------------------------------
# calibrate (for cornet)
#if(test$calibrate){
# fit$calibrate <- CalibratR::calibrate(actual=z,predicted=pred$y[,which.min(fit$gaussian$cvm)],nCores=1,model_idx=5)$calibration_models
#}
# calibrate (for predict.cornet)
#if(test$calibrate){
# prob$calibrate <- CalibratR::predict_calibratR(calibration_models=x$calibrate,new=link,nCores=1)$GUESS_2
#}
.args <- function(...){
args <- list(...)
names <- names(formals(glmnet::glmnet))
if(!is.null(args$family)){
warning("Unexpected argument \"family\".",call.=FALSE)
}
if(any(!names(args) %in% names)){
stop("Unexpected argument.",call.=FALSE)
}
if(is.null(args$alpha)) {
args$alpha <- 1
}
if(is.null(args$nlambda)){
args$nlambda <- 100
}
if(is.null(args$lambda)){
if(is.null(args$nlambda)){
args$nlambda <- 100
}
} else {
args$nlambda <- length(args$lambda)
}
return(args)
}
README.Rmd
View file @ 55267e0c
---
pagetitle: palasso
output: github_document
editor_options:
chunk_output_type: console
---
<!-- Modify xxx.Rmd, not xxx.md! -->
......@@ -13,13 +15,31 @@ knitr::opts_chunk$set(
)
```
[![Travis-CI Build Status](https://travis-ci.org/rauschenberger/cornet.svg)](https://travis-ci.org/rauschenberger/cornet)
[![AppVeyor build status](https://ci.appveyor.com/api/projects/status/github/rauschenberger/cornet?svg=true)](https://ci.appveyor.com/project/rauschenberger/cornet)
[![Coverage Status](https://codecov.io/github/rauschenberger/cornet/coverage.svg?branch=master)](https://codecov.io/github/rauschenberger/cornet)
## Scope
Lasso and ridge regression for dichotomised outcomes (extending [glmnet](https://CRAN.R-project.org/package=glmnet)).
## Installation
Install the current release from [CRAN](https://CRAN.R-project.org/package=cornet),
or the latest development version from [GitHub](https://github.com/rauschenberger/cornet):
```{r,eval=FALSE}
install.packages("cornet")
#install.packages("devtools")
devtools::install_github("rauschenberger/cornet")
```
## Reference
A Rauschenberger, and E Glaab (2019). "Lasso and ridge regression for dichotomised outcomes". Manuscript in preparation.
README.md
View file @ 55267e0c
<!-- Modify xxx.Rmd, not xxx.md! -->
[![Travis-CI Build Status](https://travis-ci.org/rauschenberger/cornet.svg)](https://travis-ci.org/rauschenberger/cornet) [![AppVeyor build status](https://ci.appveyor.com/api/projects/status/github/rauschenberger/cornet?svg=true)](https://ci.appveyor.com/project/rauschenberger/cornet)
[![Travis-CI Build Status](https://travis-ci.org/rauschenberger/cornet.svg)](https://travis-ci.org/rauschenberger/cornet) [![AppVeyor build status](https://ci.appveyor.com/api/projects/status/github/rauschenberger/cornet?svg=true)](https://ci.appveyor.com/project/rauschenberger/cornet) [![Coverage Status](https://codecov.io/github/rauschenberger/cornet/coverage.svg?branch=master)](https://codecov.io/github/rauschenberger/cornet)
Scope
-----
Lasso and ridge regression for dichotomised outcomes (extending [glmnet](https://CRAN.R-project.org/package=glmnet)).
Installation
------------
Install the current release from [CRAN](https://CRAN.R-project.org/package=cornet), or the latest development version from [GitHub](https://github.com/rauschenberger/cornet):
``` r
install.packages("cornet")
#install.packages("devtools")
devtools::install_github("rauschenberger/cornet")
```
Reference
---------
A Rauschenberger, and E Glaab (2019). "Lasso and ridge regression for dichotomised outcomes". Manuscript in preparation.
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<h1>Lasso and ridge regression for dichotomised outcomes</h1>
<small class="dont-index">Source: <a href="https://github.com/rauschenberger/colasso/blob/master/vignettes/vignette.Rmd"><code>vignettes/vignette.Rmd</code></a></small>
<div class="hidden name"><code>vignette.Rmd</code></div>
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<a href="#installation" class="anchor"></a>Installation</h2>
<p>Installing the current release from <a href="https://CRAN.R-project.org/package=cornet">CRAN</a>:</p>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r"><span class="kw">install.packages</span>(<span class="st">"cornet"</span>)</code></pre></div>
<p>Installing the latest development version from <a href="https://github.com/rauschenberger/cornet">GitHub</a>:</p>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r"><span class="co">#install.packages("devtools")</span>
<span class="kw">library</span>(devtools)
<span class="kw">install_github</span>(<span class="st">"rauschenberger/cornet"</span>)</code></pre></div>
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<a href="#tocnav" class="anchor"></a>Contents</h2>
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<li><a href="#installation">Installation</a></li>
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