Hello TN,

That is a good question. The reason why negative numbers are being removed as it would not make sense to “visually” display a negative number with the tree – as you can represent a tree branch or node with a thickness or diameter of less than 0.

But, I understand that you want that data to roll up into aggregate sums.

I suggest removing that line in the prepData() function and keeping the negative numbers in the raw data. Then in the weightedtree.js updateNode()function going through and removing any tree nodes that have a value of 0 or less. This will allow the aggregation to occur while still not trying to display negative values.

– Tom