This is no longer a part of the World of Warcraft API. It was removed in patch ≤ 3.1.3 (likely 2.0).

Gets the player's PVP contribution statistics for the previous week.

hk, dk, contribution, rank = GetPVPLastWeekStats()

Returns Edit

hk 

Number - The number of honorable kills

dk 

Number - The number of dishonorable kills

contribution 

Number - The estimated number of honor contribution points

rank 

Number - The honor rank the player hade