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<html> <head>
<title>R/qtl software for mapping quantitative trait loci</title>
<meta name="description" content="R/qtl software for mapping
quantitative trait loci (QTL) in experimental crosses.">
<meta name="keywords" content="software, statistics, bioinformatics,
genetics, statistical genetics, QTL, quantitative trait loci, QTLs,
complex traits, quantitative trait locus, genetic map, QTL mapping">
<link rel=stylesheet type="text/css" href="kbroman.css">
<link rel="SHORTCUT ICON" href="r.ico">
</head>
<body>
<h2 align="center">R/qtl: A QTL mapping environment</h2>
<h3 align="center">Software for mapping quantitative trait loci in
experimental crosses</h3>
<p align="center"> Current version: 1.66 (2023-11-27) <br>
<p align="center">[ <a
href="download">Download</a> | <a
href="faq">FAQ</a> | <a
href="https://github.com/kbroman/qtl/blob/main/NEWS.md">News</a> | <a
href="BUGS.txt">Bugs</a> | <a href="graphs">Sample
graphics</a> |
<a href="sampledata">Sample data</a> |
<a href="tutorials">Tutorials</a> |
<a href="book">Book</a> |
<a href="manual/qtl-manual.pdf">Manual</a> | <a
href="citation.html">Citation</a> ]
<p class=noindent> <hr>
<p class=center>Try the
<a
href="https://kbroman.org/qtlcharts">R/qtlcharts package</a>:
interactive graphics for QTL data.
<p class=noindent> <hr>
<p class=center><b>Check out our book:</b> <a href="book">A Guide to QTL Mapping with R/qtl</a>, by Karl W. Broman and
Śaunak Sen.</p>
<p class=noindent> <hr>
<p class=center>See
the <a href="https://github.com/kbroman/qtl">R/qtl source code on GitHub</a>;
licensed under <a href="https://github.com/kbroman/qtl/blob/main/LICENSE.md">GPL-3</a>.
<p class=noindent> <hr>
<p class=noindent> <table noborder cellpadding="0" cellspacing="1" width="100%">
<tr>
<td align="center" width="48%"><h3>About
R/qtl</h3>
<td width="4%">
<td align="center" width="48%"><h3>About
R</h3>
<tr> <td height=15>
<tr>
<td valign="top" align="left" width="48%">
<p class=noindent>R/qtl is an extensible, interactive environment for mapping
quantitative trait loci (QTL) in experimental crosses. It is
implemented as an add-on package for the freely available and widely
used statistical language/software R (see the <a
href="https://www.R-project.org" >R project
homepage</a>). The development of this software as an add-on to R
allows us to take advantage of the basic mathematical and
statistical functions, and powerful graphics capabilities, that are
provided with R. Further, the user will benefit by the seamless
integration of the QTL mapping software into a general statistical
analysis program. Our goal is to make complex QTL mapping methods
widely accessible and allow users to focus on modeling rather than
computing.
<p class=noindent>A key component of computational methods for QTL mapping is the
hidden Markov model (HMM) technology for dealing with missing
genotype data. We have implemented the main HMM algorithms, with
allowance for the presence of genotyping errors, for backcrosses,
intercrosses, and phase-known four-way crosses.
<p class=noindent>The current version of R/qtl includes facilities for estimating
genetic maps, identifying genotyping errors, and performing
single-QTL genome scans and two-QTL, two-dimensional genome scans,
by interval mapping (with the EM algorithm), Haley-Knott regression,
and multiple imputation. All of this may be done in the presence of
covariates (such as sex, age or treatment). One may also fit higher-order
QTL models by multiple imputation and Haley-Knott regression.
<p class=noindent>R/qtl is distributed as source code for unix or compiled code for
Windows or Mac. R/qtl is released under the <a
href="https://www.gnu.org/copyleft/gpl.html" >GNU
General Public License</a>. To download the software, you must agree
to the terms in that download.
<td width="4%">
<td valign="top" align="left" width="48%">
<p class=noindent> R is an open-source implementation of the S language. As described on
the <a href="https://www.R-project.org/" >R project
homepage</a>:
<p class=noindent> "<font color="#23238e">R is a system for statistical computation and
graphics. It consists of a language plus a run-time environment with
graphics, a debugger, access to certain system functions, and the
ability to run programs stored in script files.</font>
<p class=noindent>"<font color="#23238e">The core of R is an interpreted computer language
which allows branching and looping as well as modular programming
using functions. Most of the user-visible functions in R are written
in R. It is possible for the user to interface to procedures written
in the C, C++, or FORTRAN languages for efficiency. The R distribution
contains functionality for a large number of statistical
procedures. Among these are: linear and generalized linear models,
nonlinear regression models, time series analysis, classical
parametric and nonparametric tests, clustering and smoothing. There is
also a large set of functions which provide a flexible graphical
environment for creating various kinds of data
presentations. Additional modules are available for a variety of
specific purposes.</font>"
<p class=noindent> R is freely available for Windows, unix and MacOS,
and may be downloaded from the <a
href="https://cran.r-project.org">Comprehensive R Archive Network</a>
(CRAN).
<p class=noindent> Learning R may require a formidable investment
of time, but it will definitely be worth the effort. Numerous free
documents on getting started with R are available on
<a href="https://cran.r-project.org">CRAN</a>. In
addition, several books are available on R, S and S-PLUS;
for example, see WN Venables, BD Ripley (2002) <a
href="https://www.amazon.com/gp/product/0387954570?ie=UTF8&tag=7210-20">Modern Applied Statistics with S</a> (4th
ed, Springer) or P Dalgaard (2008) <a
href="https://www.amazon.com/gp/product/0387790535?ie=UTF8&tag=7210-20">Introductory
statistics with R</a> (2nd ed, Springer).
<p class=noindent> See my <a href="https://www.biostat.wisc.edu/~kbroman/Rintro">Introduction to R</a> page for further
links.
</table>
<p class=noindent> <hr>
<p class=noindent> <b>Contact</b> for
problems/questions/suggestions: <a href="https://kbroman.org">Karl W Broman</a>
<p class=noindent> <b>Authors</b>: Karl W Broman and Hao Wu, with ideas from Gary Churchill and Śaunak Sen and contributions from Danny Arends, Timothée Flutre, Ritsert Jansen, Pjotr Prins, Lars Rönnegård, Rohan Shah, Laura Shannon, Quoc Tran, Aaron Wolen, and Brian Yandell
<p class=noindent><hr>
<p class=noindent> <b>Google Groups</b>: We've created two Google
Groups for email announcements regarding software updates (<a
href="https://groups.google.com/group/Rqtl-announce">R/qtl announcements</a>)
and for discussion about the use of the software (<a
href="https://groups.google.com/group/Rqtl-disc">R/qtl discussion</a>). Note that you
should join just one of these two groups; all announcements will also
be sent to the discussion group.
<p class=noindent> <hr>
<p class=noindent> <h3>Other QTL mapping software</h3>
<p class=noindent> <table noborder cellpadding="0" cellspacing="1" width="100%">
<tr><td width="4%">
<td valign="top" width="48%">
<a href="http://www.broad.mit.edu/ftp/distribution/software/mapmaker3/">MapMaker/QTL</a>
<td valign="top" width="48%">
<a href="http://www.genenetwork.org">GeneNetwork</a>
<tr><td>
<td valign="top" width="48%">
<a href="http://statgen.ncsu.edu/qtlcart/cartographer.html">QTL Cartographer</a>
<td valign="top" width="48%">
<a href="http://www.multiqtl.com">MultiQTL</a>
<tr><td>
<td valign="top" width="48%">
<a href="https://cran.r-project.org/package=qtlDesign">R/qtlDesign</a>
<td valign="top" width="48%">
<a href="http://www.biosciences-labs.bham.ac.uk/Kearsey/applet.html">The QTL Cafe</a>
<tr><td>
<td valign="top" width="48%">
<a href="http://mtweb.cs.ucl.ac.uk/mus/www/HAPPY/happyR.shtml">HAPPY</a>
<td valign="top" width="48%">
<a href="https://forge-dga.jouy.inra.fr/projects/qtlmap">QTLMap</a></td>
<tr><td>
<td valign="top" width="48%">
<a href="http://www.kyazma.nl/">MapQTL</a>
<td valign="top" width="48%">
<a href="http://cc.oulu.fi/~misillan/#sec2">Multimapper</a>
</table>
<p class=noindent> <hr>
<p align="center">[ <a
href="download">Download</a> | <a
href="faq">FAQ</a> | <a
href="https://github.com/kbroman/qtl/blob/main/NEWS.md">News</a> | <a
href="BUGS.txt">Bugs</a> | <a href="graphs">Sample
graphics</a> |
<a href="sampledata">Sample data</a> |
<a href="tutorials">Tutorials</a> |
<a href="book">Book</a> |
<a href="manual/qtl-manual.pdf">Manual</a> | <a
href="citation.html">Citation</a> ]
<hr>
<p class=noindent>
<table cellspacing="0" cellpadding="0" width=100%>
<tr><td align="left">
<a href="https://kbroman.org">Karl Broman's home page</a>
</body></html>