I'm working with a table of demographic information about my patients and controls, such as job information, whether or not they have been exposed to heavy metal, to pesticides or to any water body, such as river, lakes and etc.
I was told that multivariable analyses could give me an idea of which of these parameters could've been a more important source of exposure to heavy metal.
http://little-book-of-r-for-multivariate-analysis.readthedocs.org/en/latest/src/multivariateanalysis.html
http://tx.shu.edu.tw/~purplewoo/Literature/!DataAnalysis/Methods%20of%20Multivariate%20Analysis.pdf
Multivariate statistical analysis deals with data consisting of sets of measurements on a number of individuals or objects. The sample data may be measures of some individuals drawn randomly from a population of school children or hospital patients in a given city, or the statistical treatment may be made on a collection of measurements, such as lengths and widths of petals of a plant taken from two species, or one may study the scores on batteries of tests administered to a number of students.
p = # of sets of measurements on a given individual,
n = # of observations = sample size
An explanation on how to use such approaches in medical studies can be found for example in : http://www.toxikonconsortium.org/toxischolar2/Readings_files/AnnalsLOGISTICarticle.pdf
Texts that you can find in the net on Multivariate analysis
Research methods. Multivariate analysis. Journal of Tropical Pediatics
http://www.oxfordjournals.org/our_journals/tropej/online/ma.html
Wolfgang Hardle & Leopold Simar 2003 Applied Multivariate Statistical Analysis TECH Method and data technology
http://www.stat.wvu.edu/~jharner/courses/stat541/mva.pdf
Methods of Multivariate Analysis
Second Edition ALVIN C. RENCHER Brigham Young University A JOHN WILEY & SONS, INC. PUBLICATION
http://tx.shu.edu.tw/~purplewoo/Literature/!DataAnalysis/
Methods%20of%20Multivariate%20Analysis.pdf
Multivariate Analysis of Ecological Data. Jan Leps & Petr Smilauer Faculty of Biological Sciences, University of South Bohemia České Budějovice, 1999
http://www.biodiversity-lorenzomarini.eu/R_manuals/Leps&Smilauer_Multivariate.pdf
When starting to work with multivariate methods I really found Bryan Manly "Multivariate Statistical Methods, A primer" to be a really useful and approachable introductory text. There are many online and package specific resources as well as others have noted but some fundamentals have not changed and can be obtained in these classic texts.
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