The Positive Matrix Factorization model is a multivariate factor analysis tool that decomposes a matrix of speciated sample data into two matrices: factor contributions and factor profiles. These factor profiles need to be interpreted by the user to identify the source types that may be contributing to the sample using measured source profile information, and emissions or discharge inventories.
You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.- PMF 5.0 User Guide (PDF)(136 pp, 7 MB, April 2014, 600-R-14-108)