Variable: gnus-thread-score-function
gnus-thread-score-function is a customizable variable defined in
gnus-sum.el.gz.
Value
+
Documentation
Function used for calculating the total score of a thread.
The function is called with the scores of the article and each subthread and should then return the score of the thread.
Some functions you can use are +, max, or min.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/gnus-sum.el.gz
(defcustom gnus-thread-score-function #'+
"Function used for calculating the total score of a thread.
The function is called with the scores of the article and each
subthread and should then return the score of the thread.
Some functions you can use are `+', `max', or `min'."
:group 'gnus-summary-sort
:type 'function)