Today I got a question on the Test Towards Reference button for collections.
The question goes:
"When I “test toward reference” a collection, the first column of report seems to have some random lacks. I send you a copy as an example.
...some reports are missing several lines, others none...
If it’s a bug, I don’t see the pattern related to it.
With another collections of 51 members, it happens the same. With other two collections (10 and 13 members), this problem doesn’t happen."
Without too much analysis, I think this is NOT due to an error in CDendro.
The first big column is supposed to be dated as
"FIRST COLUMN GROUP IS BASED ON MEMBER OFFSET RELATIVE TO BEST MATCH FOR COLLECTION"
Edit by me: (The alternative would be to have it based on the dating of the reference, but that is currently undated, see a comment by Torbjörn (tAxelson))
Then the various members, one on each row, can be placed on a certain place on the time scale depending on their offsets within the collection.
In cases when the REFERENCE has no data for that place of the time scale, then there cannot be any correlation values displayed from a "match" between the sample of that row and the reference.
Then you get these blank areas.