Recommendation System for Trustious

60,000 ratings were used and 2000 ratings were expected.

Cosine rule similarity: Error with rounding = 1.0373041983911953, Error without rounding = 1.0007667220147105, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [770, 976, 222, 32, 0, 0], Finished in 3693.176052 seconds.

Pearson's correlation simialrity: Error with rounding = 1.0793516572461452, Error without rounding = 1.037307066916652, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [741, 997, 205, 57, 0, 0], Finished in 3772.552838 seconds.

Euclidean's Distance: Error with rounding = 1.105667219374799, Error without rounding = 1.0675683922386796, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [700, 990, 267, 43, 0, 0], Finished in 3136.659491 seconds.

Dot product normalized with Euclidean distance: Error with rounding = 1.0871982339941506, Error without rounding = 1.0512248499598658, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [722, 990, 245, 42, 1, 0], Finished in 3770.770888 seconds.

Item-based rating normalization using Z-Score normalization: Error with rounding = 0.7286974680894672, Error without rounding = 0.66288539198081, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [1135, 805, 58, 1, 1, 0], Finished in 3761.289317 seconds.

Item-based rating normalization using Mean Centering normalization: Error with rounding = 0.7304108432930059, Error without rounding = 0.6667065203942877, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [1130, 810, 58, 1, 1, 0], Finished in 3726.635309 seconds.

User-based rating normalization using Z-Score normalization: Error with rounding = 0.7304108432930059, Error without rounding = 0.6695138410800626, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [1150, 781, 67, 2, 0, 0], Finished in 3618.251631 seconds.

User-based rating normalization using Mean Centering normalization: Error with rounding = 0.7358668357794091, Error without rounding = 0.6729826121518161, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [1133, 800, 64, 3, 0, 0], Finished in 3627.349486 seconds.

User-based rating normalization using Z-Score normalization, Threshold = 0.001, 0.01, 0.1, 0.2, 0.3: Error with rounding = 0.7304108432930059: Error without rounding = 0.6695138410800626: Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [1150, 781, 67, 2, 0, 0]

User-based rating normalization using Z-Score normalization, Threshold = 0.5 Error with rounding = 0.7459892760623306, Error without rounding = 0.6776399885878681, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [1115, 814, 68, 3, 0, 0], Finished in 3444.459440 seconds.

User-based rating normalization, using Z-Score normalization, Threshold = 0.1, Pearson's coefficient Error with rounding = 0.9348796714016194, Error without rounding = 0.8813904555271987, Number of ratings of absolute difference [0, 1, 2, 3, 4, 5] [877, 938, 171, 14, 0, 0], Finished in 3874.737094 seconds.

14 tests, 60 assertions, 0 failures, 0 errors, 0 skips