How are my neighbors calculated?

The neighbors are calculated by picking the users with the highest compatibility rating. The exact formula used to determine the compatibility rating of a user with you is as follows:

compatiblityRating(U) = CS(U) × SW + CF(U) × FW + CD(U) × DW

Where:
  • UThe user to compare yourself to
  • SNumber of movies seen by you
  • SUNumber of movies seen by the other user
  • FNumber of movies marked as favorite by you
  • FUNumber of movies marked as favorite by the other user
  • DNumber of movies marked as didn't liked by you
  • DUNumber of movies marked as didn't liked by the other user
  • SS(U)Number of movies seen by you and user U
  • SF(U)Number of movies marked as a favorite by you and user U
  • SD(U)Number of movies marked as a didn't liked by you and user U
  • SSP(U)Percentage of number of seen movies shared = (SS(U) / S) * 100 if S > 0; 0 if S = 0
  • SSPU(U)Percentage of number of shared seen movies = (SS(U) / SU) * 100 if SU > 0; 0 if SU = 0
  • SSF(U)Percentage of number of favorite movies shared = (SF(U) / F) * 100 if F > 0; 0 if F = 0
  • SSFU(U)Percentage of number of favorite movies shared = (SF(U) / FU) * 100 if FU > 0; 0 if FU = 0
  • SSD(U)Percentage of number of not liked movies shared = (SF(U) / F) * 100 if D > 0; 0 if D = 0
  • SSFD(U)Percentage of number of not liked movies shared = (SD(U) / DU) * 100 if DU > 0; 0 if DU = 0
  • SCScale factor = 0.3
  • MSCMaximum scaled value = 100^SC
  • SSSP(U)Scaled percentage of number of seen movies shared = ((SSP(U)^SC) / MSC) × 100
  • SSSPU(U)Scaled percentage of number of other user's shared seen movies = ((SSPU(U)^SC) / MSC) × 100
  • SSSF(U)Scaled percentage of number of favorite movies shared = ((SSF(U)^SC) / MSC) × 100
  • SSSFU(U)Scaled percentage of number of other user's shared favorite movies = ((SSFU(U)^SC) / MSC) × 100
  • SSSD(U)Scaled percentage of number of not liked movies shared = ((SSD(U)^SC) / MSC) × 100
  • SSSDU(U)Scaled percentage of number of other user's shared not liked movies = ((SSDU(U)^SC) / MSC) × 100
  • CS(U)Corrected seen movies percentage = (SSSP(U) * SSSPU(U)) / 100 if SSSP(U) < 100; 100 if SSSP(U) = 100
  • CF(U)Corrected favorite movies percentage = (SSSF(U) * SSSFU(U)) / 100 if SSSF(U) < 100; 100 if SSSF(U) = 100
  • CD(U)Corrected not liked movies percentage = (SSSD(U) * SSSDU(U)) / 100 if SSSD(U) < 100; 100 if SSSD(U) = 100
  • SWWeight applied to seen movies percentage = 0.2 if F > 0; 1.0 if F = 0 and D = 0; 0.6 if F = 0 or D = 0
  • FWWeight applied to favorite movies percentage = 0.4 if S > 0; 1.0 if S = 0 and D = 0; 0.6 if S = 0
  • DWWeight applied to not liked movies percentage = 0.4 if D > 0

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