Calculate the frequency per cambial age as suggested by Novak et al. (2013).
A data frame with numeric columns representing individual series and years as rownames where years with IADF are marked binary with 1, those without with 0, years not covered by the series are set to NA.
a data frame with pith offsets with series names in the first and pith offset as number of rings in the second column
a data frame
Novak, Klemen and S<c3><a1>nchez, Miguel Angel Saz and <c4><8c>ufar, Katarina and Ravent<c3><b3>s, Josep and de Luis, Martin, te and intra-annual density fluctuations in in Spain, IAWA Journal, 34, 459-474 (2013), DOI:https://doi.org/10.1163/22941932-00000037 http://booksandjournals.brillonline.com/content/journals/10.1163/22941932-00000037.
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