photobiologyFilters 0.4.4

Version 0.4.4 is the first version to be available through CRAN.

The main changes from version 0.4.3, the most recent version, released 16 months ago are,

  • Put all spectra into a single collection object and provide vectors of names to access them based on different criteria.
  • Rebuild data objects with current version of  ‘photobiology’ package (0.9.18).
  • Add data for MIDOPT filters.
  • Add data for an assortment of window glass types as used by CIE.
  • Fix bugs.
  • Translate User Guide to R markdown and remove the Data Catalogue vignette.

Documentation web site at

NOTE: The updated package is available from CRAN.

Please raise issues concerning bugs or enhancements to this package through Bitbucket at

Package ‘photobiology’ in METACRAN’s front page!

What a nice Christmas surprise!

‘photobiology’ is one of the nine R packages highlighted by METACRAN today as trending this week.


Nature article is wrong about 115 year limit on human lifespan – NRC


Leading scientific journal Nature reported on Wednesday about a maximum lifespan for humans. But are their statistics right?

Source: Nature article is wrong about 115 year limit on human lifespan – NRC


A small set observations with a few extreme observations plus subjective splitting of a data set into two subsets to be fitted separately to a linear regression model resulted in very clear cut conclusions and striking figures. However, none of this is solid evidence, or evidence at all supporting the paper’s conclusions. This series of articles, not only discusses the problems in the paper, but more importantly, it traces the review process that allowed it to be published in Nature.

A new analysis of the data appears in an article at “Ask a Swiss” but still based on model fitting. They detect a significant change in slope, but still we do not have confidence bands available.