Ranking Score Explained

Hi there, thanks for your interest in how we calculate an experience's ranking score. It's at the core of Rankers so I'm pleased you're curious.

The ranking score percentage is used to compare and sort experiences in ranking tables. It is not necessarily a direct measurement of the quality of a particular experience as rated by its customers. I've found it a useful tool to allow me to find the best experiences with confidence. But I've also found it important to read the customer reviews before making any final judgements!

We calculate an experience's ranking score using a multi-factor data model instead of a raw data average (mean). This model takes into account several important questions. For instance - is there a trusted body of reviews? What is the age of a review and is the review from a credible source?

Below you'll find details around some of the important factors that went into calculating the ranking score for Interislander Ferry.

If you have any questions or comments about our ranking score calculation please get in touch at info@rankers.co.nz. We don't believe this is perfect or complete so we're always interested in ways we might make improvements.

Nick Morrison's avatar

Nick Morrison

Rankers owner

Interislander Ferry

Valid Reviews

338 Valid Reviews

The Interislander Ferry experience has a total of 339 reviews. There are 338 valid reviews that are included when calculating the ranking score and 1 invalid review that are excluded from the calculation. Reviews can be excluded only when a reviewer is not verified or after an investigation by our team determines the reviewer is not genuine.

Below is the distribution of ratings for the 338 valid reviews:

Rating Count Percentage
10/10 37
11%
9/10 79
23%
8/10 103
30%
7/10 62
18%
6/10 27
8%
5/10 15
4%
4/10 6
2%
3/10 5
1%
2/10 2
1%
1/10 2
1%

77.54% Average

The raw data average (mean) for all the Interislander Ferry valid reviews is 77.54% and is based on 338 valid reviews. This value is not used to calculate the ranking score and it only provided here as a comparison to the weighted average.

Face-to-Face Reviews

309 Face-to-Face Reviews

The Rankers team meets with travellers while they’re in New Zealand and conducts face-to-face surveys. These reviews, in our opinion, are the most trusted in the industry and represent a critical control sample. To our knowledge, we are the only travel review website in the world that has gone to this extent.

More about face-to-face reviews

Within the 338 valid reviews, the experience has 309 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 309 face-to-face reviews:

Rating Count Percentage
10/10 30
10%
9/10 70
23%
8/10 98
32%
7/10 58
19%
6/10 25
8%
5/10 15
5%
4/10 6
2%
3/10 4
1%
2/10 2
1%
1/10 1
0%

77.22% Average

The raw data average (mean) for all the Interislander Ferry face-to-face reviews is 77.22% and is based on 309 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.

Weighted Average

80.13%

Rankers calculates a weighted mean as a base average on which we can improve. Individual review's ratings are given a weight based on several factors. The weight of a review determines the overall impact it'll have on the final weighted average.

Recent reviews have more weight as they are more relevant and reflect the experience as it currently operates. Over time reviews become less relevant and loose their impact on the ranking score.

Low rating reviews carry slightly less weight. This dampens the effect of very low ratings for every experience across the board. This is especially important when the experience has few reviews overall and a single negative rating can grossly mischaracterise an experience. Consistent poor reviews will still result in the experience receiving a comparitively low ranking score.

Credible sources provide reviews that can be trusted. If we have verified a reviewer is genuine via a face-to-face meeting then the review carries additional weight.

Reviewer Rating Age Face-to-Face Weight Relative Weight
Tommy Pickett 9/10 845 days true 14.9 100%
Tom Bennett 8/10 849 days true 13.86 93%
Jeny Smolders 9/10 851 days true 14.43 97%
Gregg Wagstaff 7/10 1076 days true 4.6 31%
Lianne Ijlst 8/10 1104 days true 4.73 32%
Samantha and Neis 8/10 1105 days true 4.73 32%
Brandon Cassidy 7/10 1121 days true 4.5 30%
Vic Baughen 9/10 1123 days true 4.95 33%
Anders Frank 7/10 1127 days true 4.49 30%
Dina Schurer 8/10 1128 days true 4.69 31%
Kim Youngsub 9/10 1129 days true 4.93 33%
DEBBIE LAMBERT 10/10 1133 days true 4.93 33%
Gary Williams 8/10 1133 days true 4.68 31%
Kimberley Gardien 8/10 1140 days true 4.67 31%
Antoine 9/10 1161 days true 4.87 33%
Judit Van lanen 9/10 1166 days true 4.86 33%
Bjorn Nielsen 8/10 1168 days true 4.61 31%
Joel Virtanen 9/10 1170 days true 4.85 33%
Corbin Hure 7/10 1170 days true 4.42 30%
Ron 6/10 1173 days true 4.02 27%
Thomas Simeon 8/10 1173 days true 4.6 31%
Suzannah Hill 8/10 1174 days true 4.6 31%
Kallan Mrozek 9/10 1175 days true 4.84 32%
Kees Mol 9/10 1179 days true 4.84 32%
Kristal Lavender 10/10 1179 days true 4.84 32%
Bastian Bley 9/10 1180 days true 4.83 32%
Jasmine Rogers 3/10 1181 days true 3.72 25%
Louis Nilsson 8/10 1185 days true 4.58 31%
Tim 7/10 1185 days true 4.39 29%
Jendrik 6/10 1185 days true 4.0 27%
Katharina 7/10 1186 days true 4.39 29%
Chris Valchero 9/10 1189 days true 4.82 32%
Rulp Niet 8/10 1191 days true 4.57 31%
Soeren Buchheister 9/10 1192 days true 4.81 32%
Chas Bronson 8/10 1192 days true 4.57 31%
Jakob Lovdahl 9/10 1194 days true 4.81 32%
Alexandra Schmidt 10/10 1204 days true 4.79 32%
Jade Williams 10/10 1205 days true 4.78 32%
Sam Staines 10/10 1206 days true 4.78 32%
Nickolas Jonkergouw 7/10 1210 days true 4.35 29%
Kirsty Smith 10/10 1210 days true 4.77 32%
Eva Hesse 10/10 1225 days true 4.75 32%
celine gries 8/10 1225 days true 4.51 30%
tinagermany111 8/10 1239 days true 4.48 30%
Cassandra Geyer 8/10 1424 days true 4.14 28%
Olivier Reculeau 8/10 1425 days true 4.14 28%
Thomas Michel 5/10 1426 days true 3.53 24%
Lisa Haedrich 5/10 1430 days true 3.52 24%
Nadja Guiliani 8/10 1434 days true 4.12 28%
Elbrich 8/10 1434 days true 4.12 28%
Jamie Serieux 7/10 1437 days 3.94 26%
Adele Jacques 9/10 1438 days true 4.33 29%
Daniel Weber 6/10 1440 days true 3.59 24%
Emily Noyd 8/10 1442 days true 4.1 28%
Aparna Gula 10/10 1443 days true 4.32 29%
Sebastiaan 7/10 1445 days true 3.93 26%
Andre 9/10 1446 days true 4.31 29%
Benedikt Hang 7/10 1447 days true 3.92 26%
Yannick 8/10 1447 days true 4.1 27%
S Black 9/10 1448 days true 4.31 29%
Paul Larauze 6/10 1451 days true 3.57 24%
Florence 6/10 1452 days true 3.57 24%
Sarah Kovacs 8/10 1453 days true 4.08 27%
Frenziska Schmid 7/10 1455 days true 3.91 26%
Maud Livolsi 7/10 1462 days true 3.9 26%
Lewis Whittle 6/10 1464 days true 3.55 24%
Lukas Seager 6/10 1464 days true 3.55 24%
Andrea Tabaka 8/10 1471 days true 4.05 27%
Tina Rust 8/10 1473 days true 4.05 27%
Joel Papak 8/10 1475 days true 4.04 27%
Clemence and Pedro 9/10 1476 days true 4.25 29%
Doms Wahlelr 9/10 1478 days true 4.25 29%
Josef Biller 8/10 1478 days true 4.04 27%
Justine Hoffmann 8/10 1479 days true 4.04 27%
Friederike East 7/10 1479 days true 3.87 26%
Mark White 10/10 1480 days true 4.25 28%
Briony 8/10 1483 days true 4.03 27%
Gabriel Siibers 8/10 1483 days true 4.03 27%
Henry Wichler 8/10 1484 days true 4.03 27%
Kyle Johnson 9/10 1486 days true 4.23 28%
Niels Wezenberg 7/10 1487 days true 3.85 26%
John Hamilton 9/10 1487 days true 4.23 28%
Brianna Burd 9/10 1487 days true 4.23 28%
Jessica Ruhland 8/10 1488 days true 4.02 27%
Stula Vladimir 10/10 1489 days true 4.23 28%
Cosmo Hartuna 7/10 1491 days true 3.84 26%
Roland Fischer 6/10 1491 days true 3.51 24%
Ross Holmes 9/10 1492 days true 4.22 28%
Tilman 9/10 1494 days true 4.22 28%
Petru 7/10 1495 days true 3.84 26%
Fero Saarinen 6/10 1496 days true 3.5 23%
Lauren Thompson 8/10 1498 days true 4.0 27%
Meilin 8/10 1501 days true 4.0 27%
Jonas Hoerning 10/10 1505 days true 4.2 28%
Vanesha Patel 6/10 1506 days true 3.48 23%
Mauricio Daniele 9/10 1506 days true 4.2 28%
Sara and Antoine 8/10 1508 days true 3.98 27%
Clare Pickford 6/10 1508 days true 3.48 23%
Daniel Hill 10/10 1509 days true 4.19 28%
Moritz Braun 7/10 1525 days true 3.78 25%
Grischa Rodust 8/10 1532 days true 3.94 26%
Chalie Dotesek 9/10 1533 days 4.14 28%
Julien Lafeville 7/10 1537 days true 3.76 25%
Julia Huesam 8/10 1537 days true 3.93 26%
Alexandre 9/10 1541 days true 4.13 28%
Kev Zarka 6/10 1542 days true 3.42 23%
Markus Wabing 8/10 1545 days true 3.91 26%
Gessica 6/10 1578 days true 3.37 23%
Simon Quass 9/10 1582 days true 4.05 27%
Barthelemy 7/10 1811 days true 3.27 22%
Brita Topp 10/10 2154 days 2.93 20%
Laim Thompson 8/10 2154 days 2.78 19%
Adriana 10/10 2162 days true 2.91 20%
Pavel Jarolimek 5/10 2162 days true 2.36 16%
Leonie Moeller 6/10 2163 days true 2.42 16%
Doreen Gendel 8/10 2164 days true 2.76 19%
Carla Oyarzun 3/10 2167 days true 2.23 15%
Paolo Cases 3/10 2167 days true 2.23 15%
Wolfgang and Christine 8/10 2172 days true 2.75 18%
Helen 8/10 2185 days true 2.72 18%
Olivier Carval 9/10 2187 days true 2.86 19%
Hirsch Svenja 9/10 2188 days true 2.86 19%
Mahr Svenja 8/10 2188 days true 2.72 18%
Anna Guzewiez 9/10 2204 days true 2.83 19%
Pier Durand 8/10 2208 days true 2.68 18%
Serena Poggioli 9/10 2208 days true 2.82 19%
Wayne Schist 7/10 2208 days true 2.57 17%
Margreth Lydie 5/10 2216 days true 2.27 15%
Laura Pleumeekers 7/10 2230 days true 2.53 17%
David Brooks 10/10 2233 days true 2.77 19%
Adrien Godeloup 9/10 2242 days true 2.76 18%
Bet Dreno 8/10 2243 days true 2.62 18%
Joachim 1/10 2244 days 2.01 13%
Pioter Jurkowski 7/10 2244 days 2.5 17%
Thomas Roche 9/10 2246 days true 2.75 18%
Brian 9/10 2305 days 2.63 18%
hendrik king 9/10 2428 days 2.39 16%
Kiki Wykstra 5/10 2538 days true 1.76 12%
Galen Licht 4/10 2538 days true 1.72 12%
Yu-Ti Chu 7/10 2541 days true 1.97 13%
Ton Martens 7/10 2541 days true 1.97 13%
Joshua Perry 8/10 2546 days true 2.05 14%
Molly Ladd 8/10 2546 days true 2.05 14%
Michael Nolan 9/10 2550 days 2.15 14%
Julian Roots 9/10 2550 days 2.15 14%
Florent Corino 9/10 2554 days true 2.14 14%
Amiot Cyriane 7/10 2554 days true 1.95 13%
Annika 7/10 2554 days true 1.95 13%
Jonas Herrmann 7/10 2554 days true 1.95 13%
Matthieu Daveou 8/10 2554 days true 2.04 14%
Julien Panossian 6/10 2554 days true 1.78 12%
Raoul Montestruer 5/10 2554 days true 1.74 12%
Alessa Ndra 8/10 2560 days true 2.03 14%
Bjorn Hedmark 5/10 2561 days true 1.73 12%
Evyatar Tulipman 7/10 2563 days true 1.94 13%
S Curry 10/10 2578 days 2.1 14%
Ingrid 9/10 2622 days true 2.01 13%
Reinier Timmer 7/10 2622 days true 1.83 12%
Moorman 8/10 2631 days true 1.89 13%
Stefan Roth 9/10 2656 days true 1.95 13%
David 9/10 2670 days 1.92 13%
kevindang 10/10 2823 days 1.62 11%
Ruben Kunze 4/10 2905 days true 1.15 8%
Sebastian Hol 9/10 2911 days true 1.45 10%
Dick Stewart 8/10 2920 days true 1.36 9%
David Beaumont 9/10 2927 days true 1.41 9%
Beyeler 10/10 2932 days true 1.41 9%
Nikita Sue 9/10 2937 days true 1.4 9%
Schweiger 10/10 2939 days true 1.39 9%
Jan & Marian 10/10 3018 days true 1.24 8%
Konny 9/10 3022 days true 1.23 8%
Waldemar Schuler 8/10 3022 days true 1.17 8%
jule 3/10 3036 days 0.93 6%
Jack Potman 8/10 3238 days true 0.77 5%
Jon_and_Family 9/10 3250 days 0.78 5%
Walker 9/10 3253 days true 0.78 5%
Andreas Blessing 10/10 3261 days true 0.76 5%
Gema 7/10 3264 days true 0.69 5%
Avry Fabrice 6/10 3269 days true 0.62 4%
Diane Johnston 9/10 3274 days true 0.74 5%
Javier Munoz 8/10 3274 days true 0.7 5%
Ben Akin-Smith 8/10 3275 days true 0.7 5%
K Wallis 9/10 3280 days true 0.72 5%
khs 9/10 3281 days 0.72 5%
Emma Ducat 9/10 3281 days 0.72 5%
Mr and Mrs Lambert 8/10 3288 days true 0.67 5%
Andrew Koster 7/10 3294 days true 0.63 4%
Bakker 8/10 3294 days true 0.66 4%
Kimberly St Louis 8/10 3295 days true 0.66 4%
Roel Wesstra 8/10 3301 days true 0.65 4%
Seifert 10/10 3301 days true 0.68 5%
Derek Woodward 9/10 3303 days true 0.68 5%
Fabi & Sabi 8/10 3304 days true 0.64 4%
Rosey834 8/10 3371 days 0.52 3%
Pete & Chris 10/10 3571 days true 0.15 1%
Tony Masters 9/10 3634 days true 0.03 0%
Hershell 8/10 3638 days true 0.02 0%
Mike Robinson 9/10 3639 days true 0.02 0%
Brent S 2/10 3640 days true 0.01 0%
Zara Leyden 9/10 3648 days true 0.0 0%
Judith 7/10 3652 days true 0.0 0%
anon 8/10 3653 days true 0.0 0%
Pierre Pilon 8/10 3654 days true 0.0 0%
Jenny Omb 1/10 3659 days true 0.0 0%
Frei Urs 6/10 3660 days true 0.0 0%
Bryan Keddie 9/10 3670 days true 0.0 0%
Leanne Rogan 5/10 3670 days true 0.0 0%
Joanne Clarke 8/10 3674 days true 0.0 0%
Wolfgang G 9/10 3680 days true 0.0 0%
Thomas Signes 7/10 3701 days true 0.0 0%
menzel 10/10 3719 days true 0.0 0%
graemeh1 9/10 3720 days true 0.0 0%
klinger 10/10 3720 days true 0.0 0%
gereldineb 8/10 3730 days true 0.0 0%
jennyb 9/10 3734 days true 0.0 0%
Frank de Voogd 8/10 3740 days true 0.0 0%
Jean Paul Mesnage 9/10 3746 days true 0.0 0%
Hansjoerg Ehrmann 5/10 3747 days true 0.0 0%
Daniel Alonso 9/10 3748 days true 0.0 0%
Nigel Petrie 9/10 3759 days true 0.0 0%
Tracy & Peter Cassidy 8/10 3775 days true 0.0 0%
miniappleses 8/10 3797 days 0.0 0%
Josie Boyle 7/10 3908 days true 0.0 0%
JanneP 9/10 3978 days true 0.0 0%
Mikey 9/10 3985 days true 0.0 0%
SablotniD 7/10 3989 days true 0.0 0%
WiebkeS 9/10 3996 days true 0.0 0%
Tanya 5/10 3997 days true 0.0 0%
Jan 6/10 3997 days true 0.0 0%
Viola 8/10 3999 days true 0.0 0%
RowanL 7/10 4000 days true 0.0 0%
VickiEngland 8/10 4008 days true 0.0 0%
TomC1 8/10 4013 days true 0.0 0%
AndyK 9/10 4013 days true 0.0 0%
TatiamT 9/10 4013 days true 0.0 0%
GillianK 8/10 4015 days true 0.0 0%
EelcoK 9/10 4015 days true 0.0 0%
Michael 9/10 4019 days true 0.0 0%
soccaplaya14 10/10 4020 days 0.0 0%
Eugene 7/10 4021 days true 0.0 0%
John 6/10 4023 days true 0.0 0%
Tony 8/10 4028 days true 0.0 0%
Middleton 4/10 4029 days true 0.0 0%
Elise 8/10 4030 days true 0.0 0%
Marie 8/10 4030 days true 0.0 0%
ThomasS1 10/10 4035 days true 0.0 0%
RasmusB 4/10 4037 days true 0.0 0%
Simon 8/10 4042 days true 0.0 0%
Phil&Joe 10/10 4044 days true 0.0 0%
Marcus 7/10 4044 days true 0.0 0%
Andre 7/10 4046 days true 0.0 0%
Iris 9/10 4048 days true 0.0 0%
Carla 7/10 4048 days true 0.0 0%
Sandra 8/10 4052 days true 0.0 0%
Schaffluber 10/10 4053 days true 0.0 0%
Hayley 5/10 4054 days true 0.0 0%
Con 2/10 4098 days true 0.0 0%
felix 7/10 4099 days true 0.0 0%
melissa 10/10 4105 days true 0.0 0%
John B 5/10 4108 days true 0.0 0%
Gemma 7/10 4147 days true 0.0 0%
Henry 7/10 4147 days true 0.0 0%
Antonella 10/10 4154 days true 0.0 0%
Michelle 8/10 4154 days true 0.0 0%
Laura 7/10 4163 days true 0.0 0%
Sarah 8/10 4177 days true 0.0 0%
Katerina 7/10 4198 days true 0.0 0%
Erin 3/10 4198 days true 0.0 0%
Mike Knight 9/10 4219 days true 0.0 0%
Bronagh Mcartan 8/10 4228 days true 0.0 0%
Dave 8/10 4239 days 0.0 0%
fgregory 10/10 4242 days 0.0 0%
Rhea 6/10 4288 days true 0.0 0%
Georgina Mulligan 8/10 4300 days 0.0 0%
Karen C 7/10 4312 days 0.0 0%
picman 10/10 4329 days 0.0 0%
Toby 6/10 4352 days true 0.0 0%
Jennifer Baulch 9/10 4356 days true 0.0 0%
Susan 8/10 4360 days true 0.0 0%
Hoetnagels 7/10 4363 days true 0.0 0%
Alan Bellerby 8/10 4366 days true 0.0 0%
Sanne Jonker 7/10 4367 days true 0.0 0%
Renske Tehurne 8/10 4371 days true 0.0 0%
Benjamin Krein 7/10 4371 days true 0.0 0%
Anne and Derek 8/10 4372 days true 0.0 0%
James Davies 7/10 4372 days true 0.0 0%
Naomi Horton 8/10 4373 days true 0.0 0%
Roger Repolusk 8/10 4377 days true 0.0 0%
Tony Wicks 6/10 4377 days true 0.0 0%
Nancy Dol 8/10 4377 days true 0.0 0%
Kristine 10/10 4377 days true 0.0 0%
Kathy Hawey 9/10 4379 days true 0.0 0%
David Buckley 8/10 4380 days true 0.0 0%
Lena1 6/10 4380 days 0.0 0%
John Woodrow 8/10 4381 days true 0.0 0%
Carmen Dolny 10/10 4381 days true 0.0 0%
Haemnerli 8/10 4385 days true 0.0 0%
Carla 8/10 4392 days true 0.0 0%
Jim Curley 8/10 4392 days true 0.0 0%
paulonline 7/10 4398 days 0.0 0%
Bex 6/10 4407 days 0.0 0%
Jenny Hulsebosch 8/10 4408 days true 0.0 0%
Melissa Steedman 8/10 4419 days true 0.0 0%
Tim 7/10 4420 days true 0.0 0%
Falk Seidel 7/10 4423 days true 0.0 0%
Hans Olthof 8/10 4423 days true 0.0 0%
Anu 9/10 4426 days true 0.0 0%
Anneli 6/10 4428 days true 0.0 0%
purplekat99 10/10 4436 days 0.0 0%
Connor 10/10 4449 days true 0.0 0%
Ad 7/10 4449 days true 0.0 0%
Ann Westmacott 5/10 4454 days true 0.0 0%
Paul Cowie 8/10 4455 days true 0.0 0%
Ewen Maclean 8/10 4455 days true 0.0 0%
Sarah Wilton 5/10 4455 days true 0.0 0%
Arend v Dyn 7/10 4457 days true 0.0 0%
Linda 8/10 4461 days true 0.0 0%
Fiona 7/10 4461 days true 0.0 0%
Ann 7/10 4462 days true 0.0 0%
ranker_584 9/10 4465 days true 0.0 0%
Christine 7/10 4465 days true 0.0 0%
Nina 9/10 4465 days true 0.0 0%
Anthony 7/10 4470 days true 0.0 0%
Tom Clements 7/10 4470 days true 0.0 0%
ranker_46 8/10 4582 days true 0.0 0%
Pat Brewster 8/10 4582 days true 0.0 0%
FrankOosterwijk 6/10 4667 days true 0.0 0%
Kim 8/10 4667 days true 0.0 0%
Helen 7/10 4698 days true 0.0 0%
Heather 9/10 4698 days true 0.0 0%
Helene 9/10 4710 days true 0.0 0%
John 7/10 4710 days true 0.0 0%
Giancarlo 6/10 4710 days true 0.0 0%
Annette 4/10 4734 days true 0.0 0%
John 5/10 4734 days true 0.0 0%
Duncan 9/10 4739 days true 0.0 0%
Jen 4/10 4750 days true 0.0 0%
Rolf 8/10 4758 days true 0.0 0%

Adjustments

Several adjustments to the weighted average are added to improve relevancy and credibility. These adjustments apply equally to all experiences that meet the criteria.

Sample Size Adjustment

No Adjustment

A reasonable number of reviews are necessary in order for the average to be credible and for an experience to take a prime position within the ranking tables. As such, experiences with only a few reviews have a moderated score. This does not mean that the experience or the reviews can't be trusted. The Interislander Ferry experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-3.98% Adjustment

There may be an adjustment if an experience hasn't received any reviews within the last 60 days. However the Interislander Ferry experience does not meet the criteria for any adjustment.

In addition, an experience's ranking score may be adjusted for each day there is no new ranking. After 1 day the adjustment comes into effect. The maximum number of days that can be adjusted for is 199 days.

The Interislander Ferry experience has been adjusted for 199 days. Adjustments are according to the following table.

Days Adjustment
196 -3.92%
197 -3.94%
198 -3.96%
199 -3.98%
200 -4.00%
201 -4.02%
202 -4.04%

Final Ranking Score

76%

The final ranking score once adjustments and rounding has been applied. This value is cached and recalculated each day. Therefore it may not be precisely accurate based on the other values presented.

If you have any questions or comments about our ranking score calculation please get in touch at info@rankers.co.nz.