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I need some help to produce histograms regarding my data about an algae density collected in 8 sampling sites, 4 times a year, for 5 years.

I would like to analyse them, underlining the differences in density, for each site, both among times and years but I don't know how to do this.

I can create a layer for each considered year but I'm not able to see how to compare with histograms the density among years for each site.

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You can try the QGIS plugin to analyse your data using R packages. The link above can give some tips:

http://arc-team-open-research.blogspot.com.br/2013/01/manager-usefull-plugin-for-qgis.html

Or you can export your data to one statistical software and run the analyses there. I'm still recommending R.

http://www.statmethods.net/graphs/density.html

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