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

79.94%

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 9/10 944 days true 8.61 100%
Tom Bennett 8/10 948 days true 8.0 93%
Jeny Smolders 9/10 950 days true 8.33 97%
Gregg Wagstaff 7/10 1175 days true 4.41 51%
Lianne Ijlst 8/10 1203 days true 4.55 53%
Samantha and Neis 8/10 1204 days true 4.55 53%
Brandon Cassidy 7/10 1220 days true 4.33 50%
Vic Baughen 9/10 1222 days true 4.75 55%
Anders Frank 7/10 1226 days true 4.32 50%
Dina Schurer 8/10 1227 days true 4.5 52%
Kim Youngsub 9/10 1228 days true 4.74 55%
DEBBIE LAMBERT 10/10 1232 days true 4.73 55%
Gary Williams 8/10 1232 days true 4.5 52%
Kimberley Gardien 8/10 1239 days true 4.48 52%
Antoine 9/10 1260 days true 4.68 54%
Judit Van lanen 9/10 1265 days true 4.67 54%
Bjorn Nielsen 8/10 1267 days true 4.43 51%
Joel Virtanen 9/10 1269 days true 4.66 54%
Corbin Hure 7/10 1269 days true 4.24 49%
Ron 6/10 1272 days true 3.86 45%
Thomas Simeon 8/10 1272 days true 4.42 51%
Suzannah Hill 8/10 1273 days true 4.42 51%
Kallan Mrozek 9/10 1274 days true 4.65 54%
Kees Mol 9/10 1278 days true 4.64 54%
Kristal Lavender 10/10 1278 days true 4.64 54%
Bastian Bley 9/10 1279 days true 4.64 54%
Jasmine Rogers 3/10 1280 days true 3.57 41%
Louis Nilsson 8/10 1284 days true 4.4 51%
Tim 7/10 1284 days true 4.21 49%
Jendrik 6/10 1284 days true 3.84 45%
Katharina 7/10 1285 days true 4.21 49%
Chris Valchero 9/10 1288 days true 4.62 54%
Rulp Niet 8/10 1290 days true 4.39 51%
Soeren Buchheister 9/10 1291 days true 4.62 54%
Chas Bronson 8/10 1291 days true 4.39 51%
Jakob Lovdahl 9/10 1293 days true 4.61 54%
Alexandra Schmidt 10/10 1303 days true 4.59 53%
Jade Williams 10/10 1304 days true 4.59 53%
Sam Staines 10/10 1305 days true 4.59 53%
Nickolas Jonkergouw 7/10 1309 days true 4.17 48%
Kirsty Smith 10/10 1309 days true 4.58 53%
Eva Hesse 10/10 1324 days true 4.55 53%
celine gries 8/10 1324 days true 4.32 50%
tinagermany111 8/10 1339 days true 4.3 50%
Cassandra Geyer 8/10 1523 days true 3.95 46%
Olivier Reculeau 8/10 1524 days true 3.95 46%
Thomas Michel 5/10 1525 days true 3.37 39%
Lisa Haedrich 5/10 1529 days true 3.36 39%
Nadja Guiliani 8/10 1533 days true 3.94 46%
Elbrich 8/10 1533 days true 3.94 46%
Jamie Serieux 7/10 1536 days 3.76 44%
Adele Jacques 9/10 1537 days true 4.14 48%
Daniel Weber 6/10 1539 days true 3.43 40%
Emily Noyd 8/10 1541 days true 3.92 46%
Aparna Gula 10/10 1542 days true 4.13 48%
Sebastiaan 7/10 1544 days true 3.75 44%
Andre 9/10 1545 days true 4.12 48%
Benedikt Hang 7/10 1546 days true 3.75 44%
Yannick 8/10 1546 days true 3.91 45%
S Black 9/10 1547 days true 4.12 48%
Paul Larauze 6/10 1550 days true 3.41 40%
Florence 6/10 1551 days true 3.41 40%
Sarah Kovacs 8/10 1552 days true 3.9 45%
Frenziska Schmid 7/10 1554 days true 3.73 43%
Maud Livolsi 7/10 1561 days true 3.72 43%
Lewis Whittle 6/10 1563 days true 3.39 39%
Lukas Seager 6/10 1563 days true 3.39 39%
Andrea Tabaka 8/10 1570 days true 3.87 45%
Tina Rust 8/10 1572 days true 3.86 45%
Joel Papak 8/10 1574 days true 3.86 45%
Clemence and Pedro 9/10 1575 days true 4.06 47%
Doms Wahlelr 9/10 1577 days true 4.06 47%
Josef Biller 8/10 1577 days true 3.85 45%
Justine Hoffmann 8/10 1578 days true 3.85 45%
Friederike East 7/10 1578 days true 3.69 43%
Mark White 10/10 1579 days true 4.05 47%
Briony 8/10 1582 days true 3.84 45%
Gabriel Siibers 8/10 1582 days true 3.84 45%
Henry Wichler 8/10 1583 days true 3.84 45%
Kyle Johnson 9/10 1585 days true 4.04 47%
Niels Wezenberg 7/10 1586 days true 3.68 43%
John Hamilton 9/10 1586 days true 4.04 47%
Brianna Burd 9/10 1586 days true 4.04 47%
Jessica Ruhland 8/10 1587 days true 3.84 45%
Stula Vladimir 10/10 1588 days true 4.04 47%
Cosmo Hartuna 7/10 1590 days true 3.67 43%
Roland Fischer 6/10 1590 days true 3.35 39%
Ross Holmes 9/10 1591 days true 4.03 47%
Tilman 9/10 1593 days true 4.03 47%
Petru 7/10 1594 days true 3.66 43%
Fero Saarinen 6/10 1595 days true 3.34 39%
Lauren Thompson 8/10 1597 days true 3.82 44%
Meilin 8/10 1600 days true 3.81 44%
Jonas Hoerning 10/10 1604 days true 4.0 46%
Vanesha Patel 6/10 1605 days true 3.32 39%
Mauricio Daniele 9/10 1605 days true 4.0 46%
Sara and Antoine 8/10 1607 days true 3.8 44%
Clare Pickford 6/10 1607 days true 3.32 39%
Daniel Hill 10/10 1608 days true 4.0 46%
Moritz Braun 7/10 1624 days true 3.61 42%
Grischa Rodust 8/10 1631 days true 3.75 44%
Chalie Dotesek 9/10 1632 days 3.95 46%
Julien Lafeville 7/10 1636 days true 3.59 42%
Julia Huesam 8/10 1636 days true 3.74 43%
Alexandre 9/10 1640 days true 3.93 46%
Kev Zarka 6/10 1641 days true 3.26 38%
Markus Wabing 8/10 1644 days true 3.73 43%
Gessica 6/10 1677 days true 3.2 37%
Simon Quass 9/10 1681 days true 3.85 45%
Barthelemy 7/10 1910 days true 3.1 36%
Brita Topp 10/10 2253 days 2.73 32%
Laim Thompson 8/10 2253 days 2.6 30%
Adriana 10/10 2261 days true 2.72 32%
Pavel Jarolimek 5/10 2261 days true 2.2 26%
Leonie Moeller 6/10 2262 days true 2.25 26%
Doreen Gendel 8/10 2263 days true 2.58 30%
Carla Oyarzun 3/10 2266 days true 2.09 24%
Paolo Cases 3/10 2266 days true 2.09 24%
Wolfgang and Christine 8/10 2271 days true 2.56 30%
Helen 8/10 2284 days true 2.54 29%
Olivier Carval 9/10 2286 days true 2.67 31%
Hirsch Svenja 9/10 2287 days true 2.67 31%
Mahr Svenja 8/10 2287 days true 2.53 29%
Anna Guzewiez 9/10 2303 days true 2.64 31%
Pier Durand 8/10 2307 days true 2.5 29%
Serena Poggioli 9/10 2307 days true 2.63 31%
Wayne Schist 7/10 2307 days true 2.39 28%
Margreth Lydie 5/10 2315 days true 2.12 25%
Laura Pleumeekers 7/10 2329 days true 2.35 27%
David Brooks 10/10 2332 days true 2.58 30%
Adrien Godeloup 9/10 2341 days true 2.56 30%
Bet Dreno 8/10 2342 days true 2.43 28%
Joachim 1/10 2343 days 1.87 22%
Pioter Jurkowski 7/10 2343 days 2.33 27%
Thomas Roche 9/10 2345 days true 2.55 30%
Brian 9/10 2404 days 2.44 28%
hendrik king 9/10 2527 days 2.2 26%
Kiki Wykstra 5/10 2637 days true 1.61 19%
Galen Licht 4/10 2637 days true 1.57 18%
Yu-Ti Chu 7/10 2640 days true 1.8 21%
Ton Martens 7/10 2640 days true 1.8 21%
Joshua Perry 8/10 2645 days true 1.87 22%
Molly Ladd 8/10 2645 days true 1.87 22%
Michael Nolan 9/10 2649 days 1.96 23%
Julian Roots 9/10 2649 days 1.96 23%
Florent Corino 9/10 2653 days true 1.95 23%
Amiot Cyriane 7/10 2653 days true 1.78 21%
Annika 7/10 2653 days true 1.78 21%
Jonas Herrmann 7/10 2653 days true 1.78 21%
Matthieu Daveou 8/10 2653 days true 1.85 22%
Julien Panossian 6/10 2653 days true 1.62 19%
Raoul Montestruer 5/10 2653 days true 1.58 18%
Alessa Ndra 8/10 2659 days true 1.84 21%
Bjorn Hedmark 5/10 2660 days true 1.57 18%
Evyatar Tulipman 7/10 2662 days true 1.76 20%
S Curry 10/10 2677 days 1.9 22%
Ingrid 9/10 2721 days true 1.82 21%
Reinier Timmer 7/10 2721 days true 1.65 19%
Moorman 8/10 2730 days true 1.71 20%
Stefan Roth 9/10 2755 days true 1.75 20%
David 9/10 2769 days 1.72 20%
kevindang 10/10 2922 days 1.42 17%
Ruben Kunze 4/10 3004 days true 1.0 12%
Sebastian Hol 9/10 3010 days true 1.25 15%
Dick Stewart 8/10 3019 days true 1.17 14%
David Beaumont 9/10 3026 days true 1.22 14%
Beyeler 10/10 3031 days true 1.21 14%
Nikita Sue 9/10 3036 days true 1.2 14%
Schweiger 10/10 3038 days true 1.2 14%
Jan & Marian 10/10 3117 days true 1.04 12%
Konny 9/10 3121 days true 1.04 12%
Waldemar Schuler 8/10 3121 days true 0.98 11%
jule 3/10 3135 days 0.78 9%
Jack Potman 8/10 3337 days true 0.58 7%
Jon_and_Family 9/10 3349 days 0.59 7%
Walker 9/10 3352 days true 0.58 7%
Andreas Blessing 10/10 3360 days true 0.57 7%
Gema 7/10 3363 days true 0.51 6%
Avry Fabrice 6/10 3368 days true 0.46 5%
Diane Johnston 9/10 3373 days true 0.54 6%
Javier Munoz 8/10 3373 days true 0.51 6%
Ben Akin-Smith 8/10 3374 days true 0.51 6%
K Wallis 9/10 3379 days true 0.53 6%
khs 9/10 3380 days 0.53 6%
Emma Ducat 9/10 3380 days 0.53 6%
Mr and Mrs Lambert 8/10 3387 days true 0.49 6%
Andrew Koster 7/10 3393 days true 0.46 5%
Bakker 8/10 3393 days true 0.48 6%
Kimberly St Louis 8/10 3394 days true 0.48 6%
Roel Wesstra 8/10 3400 days true 0.46 5%
Seifert 10/10 3400 days true 0.49 6%
Derek Woodward 9/10 3402 days true 0.49 6%
Fabi & Sabi 8/10 3403 days true 0.46 5%
Rosey834 8/10 3470 days 0.33 4%
Pete & Chris 10/10 3670 days true 0.0 0%
Tony Masters 9/10 3733 days true 0.0 0%
Hershell 8/10 3737 days true 0.0 0%
Mike Robinson 9/10 3738 days true 0.0 0%
Brent S 2/10 3739 days true 0.0 0%
Zara Leyden 9/10 3747 days true 0.0 0%
Judith 7/10 3751 days true 0.0 0%
anon 8/10 3752 days true 0.0 0%
Pierre Pilon 8/10 3753 days true 0.0 0%
Jenny Omb 1/10 3758 days true 0.0 0%
Frei Urs 6/10 3759 days true 0.0 0%
Bryan Keddie 9/10 3769 days true 0.0 0%
Leanne Rogan 5/10 3769 days true 0.0 0%
Joanne Clarke 8/10 3773 days true 0.0 0%
Wolfgang G 9/10 3779 days true 0.0 0%
Thomas Signes 7/10 3800 days true 0.0 0%
menzel 10/10 3818 days true 0.0 0%
graemeh1 9/10 3819 days true 0.0 0%
klinger 10/10 3819 days true 0.0 0%
gereldineb 8/10 3829 days true 0.0 0%
jennyb 9/10 3833 days true 0.0 0%
Frank de Voogd 8/10 3839 days true 0.0 0%
Jean Paul Mesnage 9/10 3845 days true 0.0 0%
Hansjoerg Ehrmann 5/10 3846 days true 0.0 0%
Daniel Alonso 9/10 3847 days true 0.0 0%
Nigel Petrie 9/10 3858 days true 0.0 0%
Tracy & Peter Cassidy 8/10 3874 days true 0.0 0%
miniappleses 8/10 3896 days 0.0 0%
Josie Boyle 7/10 4007 days true 0.0 0%
JanneP 9/10 4077 days true 0.0 0%
Mikey 9/10 4084 days true 0.0 0%
SablotniD 7/10 4089 days true 0.0 0%
WiebkeS 9/10 4095 days true 0.0 0%
Tanya 5/10 4096 days true 0.0 0%
Jan 6/10 4097 days true 0.0 0%
Viola 8/10 4098 days true 0.0 0%
RowanL 7/10 4099 days true 0.0 0%
VickiEngland 8/10 4107 days true 0.0 0%
TomC1 8/10 4112 days true 0.0 0%
AndyK 9/10 4112 days true 0.0 0%
TatiamT 9/10 4112 days true 0.0 0%
GillianK 8/10 4114 days true 0.0 0%
EelcoK 9/10 4114 days true 0.0 0%
Michael 9/10 4118 days true 0.0 0%
soccaplaya14 10/10 4119 days 0.0 0%
Eugene 7/10 4120 days true 0.0 0%
John 6/10 4123 days true 0.0 0%
Tony 8/10 4127 days true 0.0 0%
Middleton 4/10 4128 days true 0.0 0%
Elise 8/10 4130 days true 0.0 0%
Marie 8/10 4130 days true 0.0 0%
ThomasS1 10/10 4134 days true 0.0 0%
RasmusB 4/10 4136 days true 0.0 0%
Simon 8/10 4141 days true 0.0 0%
Phil&Joe 10/10 4144 days true 0.0 0%
Marcus 7/10 4144 days true 0.0 0%
Andre 7/10 4145 days true 0.0 0%
Iris 9/10 4147 days true 0.0 0%
Carla 7/10 4147 days true 0.0 0%
Sandra 8/10 4151 days true 0.0 0%
Schaffluber 10/10 4152 days true 0.0 0%
Hayley 5/10 4153 days true 0.0 0%
Con 2/10 4197 days true 0.0 0%
felix 7/10 4198 days true 0.0 0%
melissa 10/10 4205 days true 0.0 0%
John B 5/10 4207 days true 0.0 0%
Gemma 7/10 4246 days true 0.0 0%
Henry 7/10 4246 days true 0.0 0%
Antonella 10/10 4254 days true 0.0 0%
Michelle 8/10 4254 days true 0.0 0%
Laura 7/10 4262 days true 0.0 0%
Sarah 8/10 4277 days true 0.0 0%
Katerina 7/10 4297 days true 0.0 0%
Erin 3/10 4298 days true 0.0 0%
Mike Knight 9/10 4319 days true 0.0 0%
Bronagh Mcartan 8/10 4327 days true 0.0 0%
Dave 8/10 4338 days 0.0 0%
fgregory 10/10 4342 days 0.0 0%
Rhea 6/10 4387 days true 0.0 0%
Georgina Mulligan 8/10 4399 days 0.0 0%
Karen C 7/10 4411 days 0.0 0%
picman 10/10 4428 days 0.0 0%
Toby 6/10 4451 days true 0.0 0%
Jennifer Baulch 9/10 4455 days true 0.0 0%
Susan 8/10 4459 days true 0.0 0%
Hoetnagels 7/10 4462 days true 0.0 0%
Alan Bellerby 8/10 4465 days true 0.0 0%
Sanne Jonker 7/10 4466 days true 0.0 0%
Renske Tehurne 8/10 4470 days true 0.0 0%
Benjamin Krein 7/10 4470 days true 0.0 0%
Anne and Derek 8/10 4471 days true 0.0 0%
James Davies 7/10 4471 days true 0.0 0%
Naomi Horton 8/10 4472 days true 0.0 0%
Roger Repolusk 8/10 4476 days true 0.0 0%
Tony Wicks 6/10 4476 days true 0.0 0%
Nancy Dol 8/10 4476 days true 0.0 0%
Kristine 10/10 4476 days true 0.0 0%
Kathy Hawey 9/10 4478 days true 0.0 0%
David Buckley 8/10 4479 days true 0.0 0%
Lena1 6/10 4479 days 0.0 0%
John Woodrow 8/10 4480 days true 0.0 0%
Carmen Dolny 10/10 4480 days true 0.0 0%
Haemnerli 8/10 4484 days true 0.0 0%
Carla 8/10 4491 days true 0.0 0%
Jim Curley 8/10 4491 days true 0.0 0%
paulonline 7/10 4497 days 0.0 0%
Bex 6/10 4506 days 0.0 0%
Jenny Hulsebosch 8/10 4507 days true 0.0 0%
Melissa Steedman 8/10 4518 days true 0.0 0%
Tim 7/10 4519 days true 0.0 0%
Falk Seidel 7/10 4522 days true 0.0 0%
Hans Olthof 8/10 4522 days true 0.0 0%
Anu 9/10 4525 days true 0.0 0%
Anneli 6/10 4527 days true 0.0 0%
purplekat99 10/10 4535 days 0.0 0%
Connor 10/10 4548 days true 0.0 0%
Ad 7/10 4548 days true 0.0 0%
Ann Westmacott 5/10 4553 days true 0.0 0%
Paul Cowie 8/10 4554 days true 0.0 0%
Ewen Maclean 8/10 4554 days true 0.0 0%
Sarah Wilton 5/10 4554 days true 0.0 0%
Arend v Dyn 7/10 4556 days true 0.0 0%
Linda 8/10 4560 days true 0.0 0%
Fiona 7/10 4560 days true 0.0 0%
Ann 7/10 4561 days true 0.0 0%
ranker_584 9/10 4564 days true 0.0 0%
Christine 7/10 4564 days true 0.0 0%
Nina 9/10 4564 days true 0.0 0%
Anthony 7/10 4569 days true 0.0 0%
Tom Clements 7/10 4569 days true 0.0 0%
ranker_46 8/10 4681 days true 0.0 0%
Pat Brewster 8/10 4681 days true 0.0 0%
FrankOosterwijk 6/10 4766 days true 0.0 0%
Kim 8/10 4766 days true 0.0 0%
Helen 7/10 4797 days true 0.0 0%
Heather 9/10 4797 days true 0.0 0%
Helene 9/10 4809 days true 0.0 0%
John 7/10 4809 days true 0.0 0%
Giancarlo 6/10 4809 days true 0.0 0%
Annette 4/10 4833 days true 0.0 0%
John 5/10 4833 days true 0.0 0%
Duncan 9/10 4838 days true 0.0 0%
Jen 4/10 4849 days true 0.0 0%
Rolf 8/10 4857 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

-2.43% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 107 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 200 days. Due to the seasonal nature of many businesses, this adjustment is applied dynamically throughout the year.

The Interislander Ferry experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -2.40%
198 -2.41%
199 -2.42%
200 -2.43%
201 -2.45%
202 -2.46%
203 -2.47%

Final Ranking Score

78%

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.