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

339 Valid Reviews

The Interislander Ferry experience has a total of 340 reviews. There are 339 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 339 valid reviews:

Rating Count Percentage
10/10 38
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%

77.61% Average

The raw data average (mean) for all the Interislander Ferry valid reviews is 77.61% and is based on 339 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 339 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

83.11%

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
Helen Russell 10/10 30 days 99.86 100%
Tommy Pickett 9/10 1127 days true 4.94 5%
Tom Bennett 8/10 1131 days true 4.68 5%
Jeny Smolders 9/10 1133 days true 4.93 5%
Gregg Wagstaff 7/10 1358 days true 4.08 4%
Lianne Ijlst 8/10 1386 days true 4.21 4%
Samantha and Neis 8/10 1387 days true 4.21 4%
Brandon Cassidy 7/10 1403 days true 4.0 4%
Vic Baughen 9/10 1405 days true 4.39 4%
Anders Frank 7/10 1409 days true 3.99 4%
Dina Schurer 8/10 1410 days true 4.16 4%
Kim Youngsub 9/10 1411 days true 4.38 4%
DEBBIE LAMBERT 10/10 1415 days true 4.37 4%
Gary Williams 8/10 1415 days true 4.16 4%
Kimberley Gardien 8/10 1422 days true 4.14 4%
Antoine 9/10 1443 days true 4.32 4%
Judit Van lanen 9/10 1448 days true 4.31 4%
Bjorn Nielsen 8/10 1450 days true 4.09 4%
Joel Virtanen 9/10 1452 days true 4.3 4%
Corbin Hure 7/10 1452 days true 3.91 4%
Ron 6/10 1455 days true 3.57 4%
Thomas Simeon 8/10 1455 days true 4.08 4%
Suzannah Hill 8/10 1456 days true 4.08 4%
Kallan Mrozek 9/10 1457 days true 4.29 4%
Kees Mol 9/10 1461 days true 4.28 4%
Kristal Lavender 10/10 1461 days true 4.28 4%
Bastian Bley 9/10 1462 days true 4.28 4%
Jasmine Rogers 3/10 1463 days true 3.3 3%
Louis Nilsson 8/10 1467 days true 4.06 4%
Tim 7/10 1467 days true 3.89 4%
Jendrik 6/10 1467 days true 3.55 4%
Katharina 7/10 1468 days true 3.89 4%
Chris Valchero 9/10 1471 days true 4.26 4%
Rulp Niet 8/10 1473 days true 4.05 4%
Soeren Buchheister 9/10 1474 days true 4.26 4%
Chas Bronson 8/10 1474 days true 4.05 4%
Jakob Lovdahl 9/10 1476 days true 4.25 4%
Alexandra Schmidt 10/10 1486 days true 4.23 4%
Jade Williams 10/10 1487 days true 4.23 4%
Sam Staines 10/10 1488 days true 4.23 4%
Nickolas Jonkergouw 7/10 1492 days true 3.84 4%
Kirsty Smith 10/10 1492 days true 4.22 4%
Eva Hesse 10/10 1507 days true 4.19 4%
celine gries 8/10 1507 days true 3.98 4%
tinagermany111 8/10 1521 days true 3.96 4%
Cassandra Geyer 8/10 1706 days true 3.61 4%
Olivier Reculeau 8/10 1707 days true 3.61 4%
Thomas Michel 5/10 1708 days true 3.08 3%
Lisa Haedrich 5/10 1712 days true 3.07 3%
Nadja Guiliani 8/10 1716 days true 3.6 4%
Elbrich 8/10 1716 days true 3.6 4%
Jamie Serieux 7/10 1719 days 3.44 3%
Adele Jacques 9/10 1720 days true 3.78 4%
Daniel Weber 6/10 1722 days true 3.13 3%
Emily Noyd 8/10 1724 days true 3.58 4%
Aparna Gula 10/10 1725 days true 3.77 4%
Sebastiaan 7/10 1727 days true 3.42 3%
Andre 9/10 1728 days true 3.76 4%
Benedikt Hang 7/10 1729 days true 3.42 3%
Yannick 8/10 1729 days true 3.57 4%
S Black 9/10 1730 days true 3.76 4%
Paul Larauze 6/10 1733 days true 3.11 3%
Florence 6/10 1734 days true 3.11 3%
Sarah Kovacs 8/10 1735 days true 3.56 4%
Frenziska Schmid 7/10 1737 days true 3.41 3%
Maud Livolsi 7/10 1744 days true 3.39 3%
Lewis Whittle 6/10 1746 days true 3.09 3%
Lukas Seager 6/10 1746 days true 3.09 3%
Andrea Tabaka 8/10 1753 days true 3.53 4%
Tina Rust 8/10 1755 days true 3.52 4%
Joel Papak 8/10 1757 days true 3.52 4%
Clemence and Pedro 9/10 1758 days true 3.7 4%
Doms Wahlelr 9/10 1760 days true 3.7 4%
Josef Biller 8/10 1760 days true 3.51 4%
Justine Hoffmann 8/10 1761 days true 3.51 4%
Friederike East 7/10 1761 days true 3.36 3%
Mark White 10/10 1762 days true 3.69 4%
Briony 8/10 1765 days true 3.5 4%
Gabriel Siibers 8/10 1765 days true 3.5 4%
Henry Wichler 8/10 1766 days true 3.5 4%
Kyle Johnson 9/10 1768 days true 3.68 4%
Niels Wezenberg 7/10 1769 days true 3.35 3%
John Hamilton 9/10 1769 days true 3.68 4%
Brianna Burd 9/10 1769 days true 3.68 4%
Jessica Ruhland 8/10 1770 days true 3.5 4%
Stula Vladimir 10/10 1771 days true 3.68 4%
Cosmo Hartuna 7/10 1773 days true 3.34 3%
Roland Fischer 6/10 1773 days true 3.05 3%
Ross Holmes 9/10 1774 days true 3.67 4%
Tilman 9/10 1776 days true 3.67 4%
Petru 7/10 1777 days true 3.34 3%
Fero Saarinen 6/10 1778 days true 3.04 3%
Lauren Thompson 8/10 1780 days true 3.48 3%
Meilin 8/10 1783 days true 3.47 3%
Jonas Hoerning 10/10 1787 days true 3.65 4%
Vanesha Patel 6/10 1788 days true 3.02 3%
Mauricio Daniele 9/10 1788 days true 3.64 4%
Sara and Antoine 8/10 1790 days true 3.46 3%
Clare Pickford 6/10 1790 days true 3.02 3%
Daniel Hill 10/10 1791 days true 3.64 4%
Moritz Braun 7/10 1807 days true 3.28 3%
Grischa Rodust 8/10 1814 days true 3.41 3%
Chalie Dotesek 9/10 1815 days 3.59 4%
Julien Lafeville 7/10 1819 days true 3.26 3%
Julia Huesam 8/10 1819 days true 3.4 3%
Alexandre 9/10 1823 days true 3.58 4%
Kev Zarka 6/10 1824 days true 2.97 3%
Markus Wabing 8/10 1827 days true 3.39 3%
Gessica 6/10 1860 days true 2.91 3%
Simon Quass 9/10 1864 days true 3.5 4%
Barthelemy 7/10 2093 days true 2.77 3%
Brita Topp 10/10 2436 days 2.38 2%
Laim Thompson 8/10 2436 days 2.26 2%
Adriana 10/10 2444 days true 2.36 2%
Pavel Jarolimek 5/10 2444 days true 1.91 2%
Leonie Moeller 6/10 2445 days true 1.96 2%
Doreen Gendel 8/10 2446 days true 2.24 2%
Carla Oyarzun 3/10 2449 days true 1.81 2%
Paolo Cases 3/10 2449 days true 1.81 2%
Wolfgang and Christine 8/10 2454 days true 2.22 2%
Helen 8/10 2467 days true 2.2 2%
Olivier Carval 9/10 2469 days true 2.31 2%
Hirsch Svenja 9/10 2470 days true 2.31 2%
Mahr Svenja 8/10 2470 days true 2.19 2%
Anna Guzewiez 9/10 2486 days true 2.28 2%
Pier Durand 8/10 2490 days true 2.16 2%
Serena Poggioli 9/10 2490 days true 2.27 2%
Wayne Schist 7/10 2490 days true 2.07 2%
Margreth Lydie 5/10 2498 days true 1.83 2%
Laura Pleumeekers 7/10 2512 days true 2.03 2%
David Brooks 10/10 2515 days true 2.22 2%
Adrien Godeloup 9/10 2524 days true 2.2 2%
Bet Dreno 8/10 2525 days true 2.09 2%
Joachim 1/10 2526 days 1.61 2%
Pioter Jurkowski 7/10 2526 days 2.0 2%
Thomas Roche 9/10 2528 days true 2.2 2%
Brian 9/10 2587 days 2.08 2%
hendrik king 9/10 2710 days 1.84 2%
Kiki Wykstra 5/10 2820 days true 1.32 1%
Galen Licht 4/10 2820 days true 1.28 1%
Yu-Ti Chu 7/10 2823 days true 1.47 1%
Ton Martens 7/10 2823 days true 1.47 1%
Joshua Perry 8/10 2828 days true 1.53 2%
Molly Ladd 8/10 2828 days true 1.53 2%
Michael Nolan 9/10 2832 days 1.6 2%
Julian Roots 9/10 2832 days 1.6 2%
Florent Corino 9/10 2836 days true 1.59 2%
Amiot Cyriane 7/10 2836 days true 1.45 1%
Annika 7/10 2836 days true 1.45 1%
Jonas Herrmann 7/10 2836 days true 1.45 1%
Matthieu Daveou 8/10 2836 days true 1.51 2%
Julien Panossian 6/10 2836 days true 1.32 1%
Raoul Montestruer 5/10 2836 days true 1.29 1%
Alessa Ndra 8/10 2842 days true 1.5 2%
Bjorn Hedmark 5/10 2843 days true 1.28 1%
Evyatar Tulipman 7/10 2845 days true 1.43 1%
S Curry 10/10 2860 days 1.55 2%
Ingrid 9/10 2904 days true 1.46 1%
Reinier Timmer 7/10 2904 days true 1.33 1%
Moorman 8/10 2913 days true 1.37 1%
Stefan Roth 9/10 2938 days true 1.39 1%
David 9/10 2952 days 1.37 1%
kevindang 10/10 3105 days 1.07 1%
Ruben Kunze 4/10 3187 days true 0.72 1%
Sebastian Hol 9/10 3193 days true 0.89 1%
Dick Stewart 8/10 3202 days true 0.83 1%
David Beaumont 9/10 3209 days true 0.86 1%
Beyeler 10/10 3214 days true 0.85 1%
Nikita Sue 9/10 3219 days true 0.84 1%
Schweiger 10/10 3221 days true 0.84 1%
Jan & Marian 10/10 3300 days true 0.68 1%
Konny 9/10 3304 days true 0.68 1%
Waldemar Schuler 8/10 3304 days true 0.64 1%
jule 3/10 3318 days 0.5 1%
Jack Potman 8/10 3520 days true 0.24 0%
Jon_and_Family 9/10 3532 days 0.23 0%
Walker 9/10 3535 days true 0.23 0%
Andreas Blessing 10/10 3543 days true 0.21 0%
Gema 7/10 3546 days true 0.19 0%
Avry Fabrice 6/10 3551 days true 0.16 0%
Diane Johnston 9/10 3556 days true 0.18 0%
Javier Munoz 8/10 3556 days true 0.17 0%
Ben Akin-Smith 8/10 3557 days true 0.17 0%
K Wallis 9/10 3562 days true 0.17 0%
khs 9/10 3563 days 0.17 0%
Emma Ducat 9/10 3563 days 0.17 0%
Mr and Mrs Lambert 8/10 3570 days true 0.15 0%
Andrew Koster 7/10 3576 days true 0.13 0%
Bakker 8/10 3576 days true 0.14 0%
Kimberly St Louis 8/10 3577 days true 0.14 0%
Roel Wesstra 8/10 3583 days true 0.12 0%
Seifert 10/10 3583 days true 0.13 0%
Derek Woodward 9/10 3585 days true 0.13 0%
Fabi & Sabi 8/10 3586 days true 0.12 0%
Rosey834 8/10 3653 days 0.0 0%
Pete & Chris 10/10 3853 days true 0.0 0%
Tony Masters 9/10 3916 days true 0.0 0%
Hershell 8/10 3920 days true 0.0 0%
Mike Robinson 9/10 3921 days true 0.0 0%
Brent S 2/10 3922 days true 0.0 0%
Zara Leyden 9/10 3930 days true 0.0 0%
Judith 7/10 3934 days true 0.0 0%
anon 8/10 3935 days true 0.0 0%
Pierre Pilon 8/10 3936 days true 0.0 0%
Jenny Omb 1/10 3941 days true 0.0 0%
Frei Urs 6/10 3942 days true 0.0 0%
Bryan Keddie 9/10 3952 days true 0.0 0%
Leanne Rogan 5/10 3952 days true 0.0 0%
Joanne Clarke 8/10 3956 days true 0.0 0%
Wolfgang G 9/10 3962 days true 0.0 0%
Thomas Signes 7/10 3983 days true 0.0 0%
menzel 10/10 4001 days true 0.0 0%
graemeh1 9/10 4002 days true 0.0 0%
klinger 10/10 4002 days true 0.0 0%
gereldineb 8/10 4012 days true 0.0 0%
jennyb 9/10 4016 days true 0.0 0%
Frank de Voogd 8/10 4022 days true 0.0 0%
Jean Paul Mesnage 9/10 4028 days true 0.0 0%
Hansjoerg Ehrmann 5/10 4029 days true 0.0 0%
Daniel Alonso 9/10 4030 days true 0.0 0%
Nigel Petrie 9/10 4041 days true 0.0 0%
Tracy & Peter Cassidy 8/10 4057 days true 0.0 0%
miniappleses 8/10 4079 days 0.0 0%
Josie Boyle 7/10 4190 days true 0.0 0%
JanneP 9/10 4260 days true 0.0 0%
Mikey 9/10 4267 days true 0.0 0%
SablotniD 7/10 4271 days true 0.0 0%
WiebkeS 9/10 4278 days true 0.0 0%
Tanya 5/10 4279 days true 0.0 0%
Jan 6/10 4279 days true 0.0 0%
Viola 8/10 4281 days true 0.0 0%
RowanL 7/10 4282 days true 0.0 0%
VickiEngland 8/10 4290 days true 0.0 0%
TomC1 8/10 4295 days true 0.0 0%
AndyK 9/10 4295 days true 0.0 0%
TatiamT 9/10 4295 days true 0.0 0%
GillianK 8/10 4297 days true 0.0 0%
EelcoK 9/10 4297 days true 0.0 0%
Michael 9/10 4301 days true 0.0 0%
soccaplaya14 10/10 4302 days 0.0 0%
Eugene 7/10 4303 days true 0.0 0%
John 6/10 4305 days true 0.0 0%
Tony 8/10 4310 days true 0.0 0%
Middleton 4/10 4311 days true 0.0 0%
Elise 8/10 4312 days true 0.0 0%
Marie 8/10 4312 days true 0.0 0%
ThomasS1 10/10 4317 days true 0.0 0%
RasmusB 4/10 4319 days true 0.0 0%
Simon 8/10 4324 days true 0.0 0%
Phil&Joe 10/10 4326 days true 0.0 0%
Marcus 7/10 4326 days true 0.0 0%
Andre 7/10 4328 days true 0.0 0%
Iris 9/10 4330 days true 0.0 0%
Carla 7/10 4330 days true 0.0 0%
Sandra 8/10 4334 days true 0.0 0%
Schaffluber 10/10 4335 days true 0.0 0%
Hayley 5/10 4336 days true 0.0 0%
Con 2/10 4380 days true 0.0 0%
felix 7/10 4381 days true 0.0 0%
melissa 10/10 4387 days true 0.0 0%
John B 5/10 4390 days true 0.0 0%
Gemma 7/10 4428 days true 0.0 0%
Henry 7/10 4429 days true 0.0 0%
Antonella 10/10 4436 days true 0.0 0%
Michelle 8/10 4436 days true 0.0 0%
Laura 7/10 4445 days true 0.0 0%
Sarah 8/10 4459 days true 0.0 0%
Katerina 7/10 4480 days true 0.0 0%
Erin 3/10 4480 days true 0.0 0%
Mike Knight 9/10 4501 days true 0.0 0%
Bronagh Mcartan 8/10 4510 days true 0.0 0%
Dave 8/10 4521 days 0.0 0%
fgregory 10/10 4524 days 0.0 0%
Rhea 6/10 4570 days true 0.0 0%
Georgina Mulligan 8/10 4582 days 0.0 0%
Karen C 7/10 4594 days 0.0 0%
Edmund Hillstone 10/10 4611 days 0.0 0%
Toby 6/10 4634 days true 0.0 0%
Jennifer Baulch 9/10 4638 days true 0.0 0%
Susan 8/10 4642 days true 0.0 0%
Hoetnagels 7/10 4645 days true 0.0 0%
Alan Bellerby 8/10 4648 days true 0.0 0%
Sanne Jonker 7/10 4649 days true 0.0 0%
Renske Tehurne 8/10 4653 days true 0.0 0%
Benjamin Krein 7/10 4653 days true 0.0 0%
Anne and Derek 8/10 4654 days true 0.0 0%
James Davies 7/10 4654 days true 0.0 0%
Naomi Horton 8/10 4655 days true 0.0 0%
Roger Repolusk 8/10 4659 days true 0.0 0%
Tony Wicks 6/10 4659 days true 0.0 0%
Nancy Dol 8/10 4659 days true 0.0 0%
Kristine 10/10 4659 days true 0.0 0%
Kathy Hawey 9/10 4661 days true 0.0 0%
David Buckley 8/10 4662 days true 0.0 0%
Lena1 6/10 4662 days 0.0 0%
John Woodrow 8/10 4663 days true 0.0 0%
Carmen Dolny 10/10 4663 days true 0.0 0%
Haemnerli 8/10 4667 days true 0.0 0%
Carla 8/10 4674 days true 0.0 0%
Jim Curley 8/10 4674 days true 0.0 0%
paulonline 7/10 4680 days 0.0 0%
Bex 6/10 4689 days 0.0 0%
Jenny Hulsebosch 8/10 4690 days true 0.0 0%
Melissa Steedman 8/10 4701 days true 0.0 0%
Tim 7/10 4702 days true 0.0 0%
Falk Seidel 7/10 4705 days true 0.0 0%
Hans Olthof 8/10 4705 days true 0.0 0%
Anu 9/10 4708 days true 0.0 0%
Anneli 6/10 4710 days true 0.0 0%
purplekat99 10/10 4718 days 0.0 0%
Connor 10/10 4731 days true 0.0 0%
Ad 7/10 4731 days true 0.0 0%
Ann Westmacott 5/10 4736 days true 0.0 0%
Paul Cowie 8/10 4737 days true 0.0 0%
Ewen Maclean 8/10 4737 days true 0.0 0%
Sarah Wilton 5/10 4737 days true 0.0 0%
Arend v Dyn 7/10 4739 days true 0.0 0%
Linda 8/10 4743 days true 0.0 0%
Fiona 7/10 4743 days true 0.0 0%
Ann 7/10 4744 days true 0.0 0%
ranker_584 9/10 4747 days true 0.0 0%
Christine 7/10 4747 days true 0.0 0%
Nina 9/10 4747 days true 0.0 0%
Anthony 7/10 4752 days true 0.0 0%
Tom Clements 7/10 4752 days true 0.0 0%
ranker_46 8/10 4864 days true 0.0 0%
Pat Brewster 8/10 4864 days true 0.0 0%
FrankOosterwijk 6/10 4949 days true 0.0 0%
Kim 8/10 4949 days true 0.0 0%
Helen 7/10 4980 days true 0.0 0%
Heather 9/10 4980 days true 0.0 0%
Helene 9/10 4992 days true 0.0 0%
John 7/10 4992 days true 0.0 0%
Giancarlo 6/10 4992 days true 0.0 0%
Annette 4/10 5016 days true 0.0 0%
John 5/10 5016 days true 0.0 0%
Duncan 9/10 5021 days true 0.0 0%
Jen 4/10 5032 days true 0.0 0%
Rolf 8/10 5040 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

-0.06% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 43 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 3 days. Adjustments are according to the following table.

Days Adjustment
0 -0.00%
1 -0.02%
2 -0.04%
3 -0.06%
4 -0.08%
5 -0.10%
6 -0.12%

Final Ranking Score

83%

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.