Best bets for:

Shinpi no Sekai El Hazard 2

Rating Average: 2.5000
Rating Stddev: 1
Review Count: 8
Existing Best Bet #: 2.79202967422018
( $rating_average - $rating_stddev ) + ( log($reviews) / log(5) )
( 2.5000 - 1 ) + ( 2.07944154167984 / 1.6094379124341 )
( 1.5 ) - 1.29202967422018
Proposed Best Bet #:
( ( $rating_average - ( $rating_stddev / 2) ) - ( ( $stddev==0 and $reviews<5)? .5: 0 ) * $similarity
( ( 2.5000 - 0.5 ) - 0 ) * $similarity
( 2 - 0 ) * $similarity
2 * $similarity
In English: Average rating minus half the standard deviation of the ratings, with a penalty of half a rating point if there are fewer then five reviews with no variation in their ratings.
Discussion: This uses the average rating as the base, lowering the overall rating based on the amount of variance in the ratings. Additionally it lowers the rating if only a few people have rated it and they've all given it the same score. Perhaps shows with few ratings shouldn't even show up in best bets.

Keywords: 5 - Comedy, Fantasy, OVA, Genie, 1997

For reference, Devil Doll's similarity calc is this:
( $matching_keys * ( $matching_keys / $total_keys ) * $total_keys ) / ( $total_keys * $total_keys )
Pool of potential series:
TitleKey MatchRatingRating - stddevDevil Doll's Similarity CalcNew bbetNew bbet * SimilarityOld bbetOld bbet * Similarity
Shinpi no Sekai El Hazard 4 3.44 3.00 64% 3.00 1.92 4.34 2.78
Choujuu Densetsu Geshutaruto 4 3.00 2.39 64% 2.39 1.53 2.64 1.69
Shoujo Kakumei Utena 3 3.83 3.65 36% 3.65 1.31 5.26 1.89
Haiyore! Nyaruko-san OVA 3 4.00 4.00 36% 3.50 1.26 4.00 1.44
Tetsuwan Birdy 3 4.00 4.00 36% 3.50 1.26 4.43 1.60
Hagane no Renkinjutsushi OVA (03): Shishou (Sensei) Monogatari 3 4.00 4.00 36% 3.50 1.26 4.00 1.44
Full Metal Alchemist OVA2: Simple People 3 4.00 4.00 36% 3.50 1.26 4.00 1.44
Shakugan no Shana-tan Returns 3 4.00 4.00 36% 3.50 1.26 4.00 1.44
Wanpanman OVAs & Specials 3 4.00 4.00 36% 3.50 1.26 4.00 1.44
Slayers Try 3 3.69 3.39 36% 3.39 1.22 4.68 1.68
Mahou Tsukai Tai! 3 3.60 3.27 36% 3.27 1.18 4.37 1.57
Mahou Sensei Negima! Shiroki Tsubasa Ala Alba 3 3.50 3.25 36% 3.25 1.17 3.43 1.24
Hagane no Renkinjutsushi: Chibi Party 3 3.50 3.25 36% 3.25 1.17 3.43 1.24
Bakuretsu Hunters OVA 3 3.17 2.98 36% 2.98 1.07 3.91 1.41
Tenchi Muyou! Ryououki 3 3.45 2.96 36% 2.96 1.07 4.39 1.58
Rekka no Honoo 3 3.36 2.92 36% 2.92 1.05 3.97 1.43
Aa! Megami-sama: Chichai tte Koto wa Benri da Ne 3 3.33 2.91 36% 2.91 1.05 4.03 1.45
Yosei Hime Rane 3 3.33 2.86 36% 2.86 1.03 3.07 1.11
Battle Athletes (OAV) 3 3.20 2.83 36% 2.83 1.02 3.45 1.24
Hikyou Tanken Fam and Ihrie 3 3.25 2.77 36% 2.77 1.00 3.57 1.29
Dragon Half 3 3.12 2.73 36% 2.73 0.98 3.64 1.31
Idol Project 4 2.00 2.00 64% 1.50 0.96 2.43 1.56
Kotetsu no Diaboken 4 2.00 2.00 64% 1.50 0.96 2.68 1.72
Shamanic Princess 3 3.10 2.63 36% 2.63 0.95 3.59 1.29
Mahou Shoujo Pretty Sammy (OAV) 3 2.80 2.60 36% 2.60 0.94 3.40 1.22
Sekirei OVA 3 3.00 2.59 36% 2.59 0.93 2.87 1.03
Dai Mahou Touge Omake 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Princess Rouge 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Mahou Shoujo Tai Arusu the Adventure 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Little Witch Academia OVA 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Little Witch Academia: Mahōjikake no Parade 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Slayers Excellent 3 3.00 3.00 36% 2.50 0.90 3.68 1.33
QUIZ Magic Academy ~The Original Animation~ 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Higurashi no Naku Koro ni Rei 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Variable Geo 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Cardcaptor Sakura: Clear Card-hen Prologue - Sakura to Futatsu no Kuma 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Vampire Hunter 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Carnival Phantasm 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Mai-HiME Omake Special 3 3.00 3.00 36% 2.50 0.90 3.43 1.24
Watashi no Coffee Samurai - Jihanki-teki na Kareshi 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Black Lagoon Omake 3 3.00 3.00 36% 2.50 0.90 3.43 1.24
Kaleido Star: New Wings Extra Stage 3 3.00 3.00 36% 2.50 0.90 3.00 1.08
Slayers Special 3 2.67 2.43 36% 2.43 0.88 2.88 1.04
Sakura Taisen: Ouka Kenran 3 2.88 2.41 36% 2.41 0.87 3.24 1.17
Aika 3 2.88 2.41 36% 2.41 0.87 3.24 1.17
Shinpi no Sekai El Hazard (TV-2) 3 2.86 2.36 36% 2.36 0.85 3.08 1.11
Photon 3 2.67 2.29 36% 2.29 0.83 3.03 1.09
Dragon Knight 3 2.50 2.25 36% 2.25 0.81 2.43 0.88
Murder Princess 3 2.50 2.25 36% 2.25 0.81 2.43 0.88
Mirai Nikki Redial 3 2.50 2.25 36% 2.25 0.81 2.43 0.88

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