These rankings are not official and are based on Inara commanders wishing to participate. The rankings are calculated JUST from the values gained via 'Import Frontier Data' feature to ensure all the data provided are valid and not altered in any manner.
The score for the main ladder is based on Combat, Trade and Exploration ranks, including their progress (1.000 points for each tier) with the addition of points for other activities (bounties, combat bonds, trades, scans, etc.) for a few hundred or thousand points, to differentiate commanders on high ranks. No credits/assets values are used.
The score for the CQC ladder is based on CQC rank, including its progress (1.000 points for each tier) with the addition of points for kills (typically up to few hundreds of points). Unfortunately, at this moment is not possible no include Prestige and (numerical) rank. Commanders with 'oddly unrealistic' stats are automatically omitted from the rankings.