How much is the Umetrics SIMCA software? ae there alternative softwares that are cheaper or free?

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What could cause these "frowning" bands seen in electrophoresis (SDS-PAGE)?

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How to calculate average trend in maximum annual NDVI from MODIS?

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David Balgoma

You have the package ropls in R:

https://bioconductor.org/packages/release/bioc/html/ropls.html

Use OPLS and OPLS-DA with care, as they tend to over fit the data. Here you have a good explanation:

https://pubmed.ncbi.nlm.nih.gov/27547730/

Pierre Pétriacq

You can also use free online tools for multivariate statistics: MetaboAnalyst (https://www.metaboanalyst.ca/) or Biostatflow (http://biostatflow.org).