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Ranking Score Explained

G'day, 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.

Cymen Crick's avatar

Cymen Crick

Rankers Owner

Interislander Ferry

Valid Reviews

349 Valid Reviews

The Interislander Ferry experience has a total of 361 reviews. There are 349 valid reviews that are included when calculating the ranking score and 12 invalid reviews 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 349 valid reviews:

Rating Count Percentage
10/10 40
11%
9/10 81
23%
8/10 103
30%
7/10 62
18%
6/10 29
8%
5/10 16
5%
4/10 7
2%
3/10 5
1%
2/10 2
1%
1/10 4
1%

77.13% Average

The raw data average (mean) for all the Interislander Ferry valid reviews is 77.13% and is based on 349 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 349 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

73.67%

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 Relative Weight
Rina 9/10 130 days 100%
edm 1/10 404 days 38%
Colin Barrow 9/10 465 days 89%
Pauline 6/10 618 days 69%
Megan 5/10 770 days 51%
Marjolaine Loitz 4/10 800 days 42%
Keli Knox 10/10 1135 days 33%
Yar 1/10 1349 days 7%
Pinocity 6/10 1714 days 5%
Helen Russell 10/10 1895 days 5%
NewZealander 10/10 2169 days 4%
Tommy Pickett 9/10 2992 days 3%
Tom Bennett 8/10 2996 days 3%
Jeny Smolders 9/10 2998 days 3%
Gregg Wagstaff 7/10 3223 days 2%
Lianne Ijlst 8/10 3251 days 2%
Samantha and Neis 8/10 3252 days 2%
Brandon Cassidy 7/10 3268 days 2%
Vic Baughen 9/10 3270 days 2%
Anders Frank 7/10 3274 days 2%
Dina Schurer 8/10 3275 days 2%
Kim Youngsub 9/10 3276 days 2%
DEBBIE LAMBERT 10/10 3280 days 2%
Gary Williams 8/10 3280 days 2%
Kimberley Gardien 8/10 3287 days 2%
Antoine 9/10 3308 days 2%
Judit Van lanen 9/10 3313 days 2%
Bjorn Nielsen 8/10 3315 days 2%
Joel Virtanen 9/10 3317 days 2%
Corbin Hure 7/10 3317 days 2%
Ron 6/10 3320 days 2%
Thomas Simeon 8/10 3320 days 2%
Suzannah Hill 8/10 3321 days 2%
Kallan Mrozek 9/10 3322 days 2%
Kees Mol 9/10 3326 days 2%
Kristal Lavender 10/10 3326 days 2%
Bastian Bley 9/10 3327 days 2%
Jasmine Rogers 3/10 3328 days 1%
Louis Nilsson 8/10 3332 days 2%
Tim 7/10 3332 days 2%
Jendrik 6/10 3332 days 2%
Katharina 7/10 3333 days 2%
Chris Valchero 9/10 3336 days 2%
Rulp Niet 8/10 3338 days 2%
Soeren Buchheister 9/10 3339 days 2%
Chas Bronson 8/10 3339 days 2%
Jakob Lovdahl 9/10 3341 days 2%
Alexandra Schmidt 10/10 3351 days 2%
Jade Williams 10/10 3352 days 2%
Sam Staines 10/10 3353 days 2%
Nickolas Jonkergouw 7/10 3357 days 2%
Kirsty Smith 10/10 3357 days 2%
Eva Hesse 10/10 3372 days 2%
celine gries 8/10 3372 days 2%
tinagermany111 8/10 3387 days 2%
Cassandra Geyer 8/10 3571 days 2%
Olivier Reculeau 8/10 3572 days 2%
Thomas Michel 5/10 3573 days 1%
Lisa Haedrich 5/10 3577 days 1%
Nadja Guiliani 8/10 3581 days 2%
Elbrich 8/10 3581 days 2%
Jamie Serieux 7/10 3584 days 1%
Adele Jacques 9/10 3585 days 2%
Daniel Weber 6/10 3587 days 1%
Emily Noyd 8/10 3589 days 2%
Aparna Gula 10/10 3590 days 2%
Sebastiaan 7/10 3592 days 1%
Andre 9/10 3593 days 2%
Benedikt Hang 7/10 3594 days 1%
Yannick 8/10 3594 days 2%
S Black 9/10 3595 days 2%
Paul Larauze 6/10 3598 days 1%
Florence 6/10 3599 days 1%
Sarah Kovacs 8/10 3600 days 2%
Frenziska Schmid 7/10 3602 days 1%
Maud Livolsi 7/10 3609 days 1%
Lewis Whittle 6/10 3611 days 1%
Lukas Seager 6/10 3611 days 1%
Andrea Tabaka 8/10 3618 days 1%
Tina Rust 8/10 3620 days 1%
Joel Papak 8/10 3622 days 1%
Clemence and Pedro 9/10 3623 days 1%
Doms Wahlelr 9/10 3625 days 1%
Josef Biller 8/10 3625 days 1%
Justine Hoffmann 8/10 3626 days 1%
Friederike East 7/10 3626 days 1%
Mark White 10/10 3627 days 1%
Briony 8/10 3630 days 1%
Gabriel Siibers 8/10 3630 days 1%
Henry Wichler 8/10 3631 days 1%
Kyle Johnson 9/10 3633 days 1%
Niels Wezenberg 7/10 3634 days 1%
John Hamilton 9/10 3634 days 1%
Brianna Burd 9/10 3634 days 1%
Jessica Ruhland 8/10 3635 days 1%
Stula Vladimir 10/10 3636 days 1%
Cosmo Hartuna 7/10 3638 days 1%
Roland Fischer 6/10 3638 days 1%
Ross Holmes 9/10 3639 days 1%
Tilman 9/10 3641 days 1%
Petru 7/10 3642 days 1%
Fero Saarinen 6/10 3643 days 1%
Lauren Thompson 8/10 3645 days 1%
Meilin 8/10 3648 days 1%
Jonas Hoerning 10/10 3652 days 1%
Vanesha Patel 6/10 3653 days 1%
Mauricio Daniele 9/10 3653 days 1%
Sara and Antoine 8/10 3655 days 1%
Clare Pickford 6/10 3655 days 1%
Daniel Hill 10/10 3656 days 1%
Moritz Braun 7/10 3672 days 1%
Grischa Rodust 8/10 3679 days 1%
Chalie Dotesek 9/10 3680 days 1%
Julien Lafeville 7/10 3684 days 1%
Julia Huesam 8/10 3684 days 1%
Alexandre 9/10 3688 days 1%
Kev Zarka 6/10 3689 days 1%
Markus Wabing 8/10 3692 days 1%
Gessica 6/10 3725 days 1%
Simon Quass 9/10 3729 days 1%
Barthelemy 7/10 3958 days 1%
Brita Topp 10/10 4301 days 0%
Laim Thompson 8/10 4301 days 0%
Adriana 10/10 4309 days 0%
Pavel Jarolimek 5/10 4309 days 0%
Leonie Moeller 6/10 4310 days 0%
Doreen Gendel 8/10 4311 days 0%
Carla Oyarzun 3/10 4314 days 0%
Paolo Cases 3/10 4314 days 0%
Wolfgang and Christine 8/10 4319 days 0%
Helen 8/10 4332 days 0%
Olivier Carval 9/10 4334 days 0%
Hirsch Svenja 9/10 4335 days 0%
Mahr Svenja 8/10 4335 days 0%
Anna Guzewiez 9/10 4351 days 0%
Pier Durand 8/10 4355 days 0%
Serena Poggioli 9/10 4355 days 0%
Wayne Schist 7/10 4355 days 0%
Margreth Lydie 5/10 4363 days 0%
Laura Pleumeekers 7/10 4377 days 0%
David Brooks 10/10 4380 days 1%
Adrien Godeloup 9/10 4389 days 1%
Bet Dreno 8/10 4390 days 1%
Joachim 1/10 4391 days 0%
Pioter Jurkowski 7/10 4391 days 1%
Thomas Roche 9/10 4393 days 1%
Brian 9/10 4452 days 1%
hendrik king 9/10 4575 days 1%
Kiki Wykstra 5/10 4685 days 1%
Galen Licht 4/10 4685 days 1%
Yu-Ti Chu 7/10 4688 days 1%
Ton Martens 7/10 4688 days 1%
Joshua Perry 8/10 4693 days 1%
Molly Ladd 8/10 4693 days 1%
Michael Nolan 9/10 4697 days 1%
Julian Roots 9/10 4697 days 1%
Florent Corino 9/10 4701 days 1%
Amiot Cyriane 7/10 4701 days 1%
Annika 7/10 4701 days 1%
Jonas Herrmann 7/10 4701 days 1%
Matthieu Daveou 8/10 4701 days 1%
Julien Panossian 6/10 4701 days 1%
Raoul Montestruer 5/10 4701 days 1%
Alessa Ndra 8/10 4707 days 1%
Bjorn Hedmark 5/10 4708 days 1%
Evyatar Tulipman 7/10 4710 days 1%
S Curry 10/10 4725 days 1%
Ingrid 9/10 4769 days 1%
Reinier Timmer 7/10 4769 days 1%
Moorman 8/10 4778 days 1%
Stefan Roth 9/10 4803 days 1%
David 9/10 4817 days 1%
kevindang 10/10 4970 days 1%
Ruben Kunze 4/10 5052 days 1%
Sebastian Hol 9/10 5058 days 1%
Dick Stewart 8/10 5067 days 1%
David Beaumont 9/10 5074 days 1%
Beyeler 10/10 5079 days 1%
Nikita Sue 9/10 5084 days 1%
Schweiger 10/10 5086 days 1%
Jan & Marian 10/10 5165 days 1%
Konny 9/10 5169 days 1%
Waldemar Schuler 8/10 5169 days 1%
jule 3/10 5183 days 1%
Jack Potman 8/10 5385 days 1%
Jon_and_Family 9/10 5397 days 1%
Walker 9/10 5400 days 1%
Andreas Blessing 10/10 5408 days 1%
Gema 7/10 5411 days 1%
Avry Fabrice 6/10 5416 days 1%
Diane Johnston 9/10 5421 days 1%
Javier Munoz 8/10 5421 days 1%
Ben Akin-Smith 8/10 5422 days 1%
K Wallis 9/10 5427 days 1%
khs 9/10 5428 days 1%
Emma Ducat 9/10 5428 days 1%
Mr and Mrs Lambert 8/10 5435 days 1%
Andrew Koster 7/10 5441 days 1%
Bakker 8/10 5441 days 1%
Kimberly St Louis 8/10 5442 days 1%
Roel Wesstra 8/10 5448 days 1%
Seifert 10/10 5448 days 1%
Derek Woodward 9/10 5450 days 1%
Fabi & Sabi 8/10 5451 days 1%
Rosey834 8/10 5518 days 1%
Pete & Chris 10/10 5718 days 1%
Tony Masters 9/10 5781 days 1%
Hershell 8/10 5785 days 1%
Mike Robinson 9/10 5786 days 1%
Brent S 2/10 5787 days 0%
Zara Leyden 9/10 5795 days 1%
Judith 7/10 5799 days 1%
anon 8/10 5800 days 1%
Pierre Pilon 8/10 5801 days 1%
Jenny Omb 1/10 5806 days 0%
Frei Urs 6/10 5807 days 1%
Bryan Keddie 9/10 5817 days 1%
Leanne Rogan 5/10 5817 days 1%
Joanne Clarke 8/10 5821 days 1%
Wolfgang G 9/10 5827 days 1%
Thomas Signes 7/10 5848 days 1%
menzel 10/10 5866 days 1%
graemeh1 9/10 5867 days 1%
klinger 10/10 5867 days 1%
gereldineb 8/10 5877 days 1%
jennyb 9/10 5881 days 1%
Frank de Voogd 8/10 5887 days 1%
Jean Paul Mesnage 9/10 5893 days 1%
Hansjoerg Ehrmann 5/10 5894 days 1%
Daniel Alonso 9/10 5895 days 1%
Nigel Petrie 9/10 5906 days 1%
Tracy & Peter Cassidy 8/10 5922 days 1%
miniappleses 8/10 5944 days 1%
Josie Boyle 7/10 6055 days 1%
JanneP 9/10 6125 days 1%
Mikey 9/10 6132 days 1%
SablotniD 7/10 6137 days 1%
WiebkeS 9/10 6143 days 1%
Tanya 5/10 6145 days 1%
Jan 6/10 6145 days 1%
Viola 8/10 6147 days 1%
RowanL 7/10 6147 days 1%
VickiEngland 8/10 6155 days 1%
TomC1 8/10 6160 days 1%
AndyK 9/10 6160 days 1%
TatiamT 9/10 6160 days 1%
GillianK 8/10 6162 days 1%
EelcoK 9/10 6162 days 1%
Michael 9/10 6166 days 1%
soccaplaya14 10/10 6167 days 1%
Eugene 7/10 6169 days 1%
John 6/10 6171 days 1%
Tony 8/10 6176 days 1%
Middleton 4/10 6177 days 1%
Elise 8/10 6178 days 1%
Marie 8/10 6178 days 1%
ThomasS1 10/10 6182 days 1%
RasmusB 4/10 6184 days 1%
Simon 8/10 6189 days 1%
Phil&Joe 10/10 6192 days 1%
Marcus 7/10 6192 days 1%
Andre 7/10 6193 days 1%
Iris 9/10 6195 days 1%
Carla 7/10 6196 days 1%
Sandra 8/10 6200 days 1%
Schaffluber 10/10 6201 days 1%
Hayley 5/10 6201 days 1%
Con 2/10 6246 days 0%
felix 7/10 6247 days 1%
melissa 10/10 6253 days 1%
John B 5/10 6255 days 1%
Gemma 7/10 6294 days 1%
Henry 7/10 6295 days 1%
Antonella 10/10 6302 days 1%
Michelle 8/10 6302 days 1%
Laura 7/10 6311 days 1%
Sarah 8/10 6325 days 1%
Katerina 7/10 6346 days 1%
Erin 3/10 6346 days 1%
Mike Knight 9/10 6367 days 1%
Bronagh Mcartan 8/10 6376 days 1%
Dave 8/10 6387 days 1%
fgregory 10/10 6390 days 1%
Rhea 6/10 6435 days 1%
Georgina Mulligan 8/10 6447 days 1%
Karen C 7/10 6459 days 1%
Edmund Hillstone 10/10 6477 days 1%
Toby 6/10 6499 days 1%
Jennifer Baulch 9/10 6503 days 1%
Susan 8/10 6507 days 1%
Hoetnagels 7/10 6510 days 1%
Alan Bellerby 8/10 6513 days 1%
Sanne Jonker 7/10 6514 days 1%
Renske Tehurne 8/10 6518 days 1%
Benjamin Krein 7/10 6518 days 1%
Anne and Derek 8/10 6519 days 1%
James Davies 7/10 6519 days 1%
Naomi Horton 8/10 6520 days 1%
Roger Repolusk 8/10 6524 days 1%
Tony Wicks 6/10 6524 days 1%
Nancy Dol 8/10 6524 days 1%
Kristine 10/10 6524 days 1%
Kathy Hawey 9/10 6526 days 1%
David Buckley 8/10 6527 days 1%
Lena1 6/10 6528 days 1%
John Woodrow 8/10 6528 days 1%
Carmen Dolny 10/10 6528 days 1%
Haemnerli 8/10 6532 days 1%
Carla 8/10 6539 days 1%
Jim Curley 8/10 6539 days 1%
paulonline 7/10 6545 days 1%
Bex 6/10 6555 days 1%
Jenny Hulsebosch 8/10 6555 days 1%
Melissa Steedman 8/10 6566 days 1%
Tim 7/10 6567 days 1%
Falk Seidel 7/10 6570 days 1%
Hans Olthof 8/10 6570 days 1%
Anu 9/10 6573 days 1%
Anneli 6/10 6575 days 1%
purplekat99 10/10 6583 days 1%
Connor 10/10 6596 days 1%
Ad 7/10 6596 days 1%
Ann Westmacott 5/10 6601 days 1%
Paul Cowie 8/10 6602 days 1%
Ewen Maclean 8/10 6602 days 1%
Sarah Wilton 5/10 6602 days 1%
Arend v Dyn 7/10 6604 days 1%
Linda 8/10 6608 days 1%
Fiona 7/10 6608 days 1%
Ann 7/10 6609 days 1%
ranker_584 9/10 6612 days 1%
Christine 7/10 6612 days 1%
Nina 9/10 6612 days 1%
Anthony 7/10 6617 days 1%
Tom Clements 7/10 6617 days 1%
ranker_46 8/10 6729 days 1%
Pat Brewster 8/10 6729 days 1%
FrankOosterwijk 6/10 6814 days 1%
Kim 8/10 6814 days 1%
Helen 7/10 6845 days 1%
Heather 9/10 6845 days 1%
Helene 9/10 6857 days 1%
John 7/10 6857 days 1%
Giancarlo 6/10 6857 days 1%
Annette 4/10 6881 days 1%
John 5/10 6881 days 1%
Duncan 9/10 6886 days 1%
Jen 4/10 6897 days 1%
Rolf 8/10 6905 days 1%

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

-2.45% 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 121 days. Adjustments are according to the following table.

Days Adjustment
… …
118 -2.39%
119 -2.41%
120 -2.43%
121 -2.45%
122 -2.47%
123 -2.49%
124 -2.51%
… …

Balancing Adjustment

6.33% Adjustment

Every experience's review score is adjusted to balance out the disproportional number of negative reviews that are contributed.

You won't be surprised to learn that disgruntled customers are more likely to leave a review than happy ones. They are motivated to share their experience and warn others. We consider this a good thing and it's why reading the reviews is important. However we've learned it can misrepresent the experience in a more overall sense.

We apply a balancing adjustment to counteract this effect and ensure the ranking score is a more fair representation of the experience. This adjustment is applied equally to all experiences.

Final Ranking Score

78%

The final ranking score once any adjustments, ratings, and rounding has been applied. This value is recalculated each day and a short rolling average is applied. Therefore it may not be precisely accurate based on the other values presented.