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Ranking Score Explained

Hey, 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

353 Valid Reviews

The Interislander Ferry experience has a total of 364 reviews. There are 353 valid reviews that are included when calculating the ranking score and 11 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 353 valid reviews:

Rating Count Percentage
10/10 41
12%
9/10 81
23%
8/10 103
29%
7/10 62
18%
6/10 29
8%
5/10 16
5%
4/10 7
2%
3/10 5
1%
2/10 3
1%
1/10 6
2%

76.66% Average

The raw data average (mean) for all the Interislander Ferry valid reviews is 76.66% and is based on 353 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 353 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

68.99%

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
Herb Klein 2/10 111 days 46%
Nico 1/10 111 days 41%
Ruban K 1/10 139 days 41%
Maria Longstaff 10/10 170 days 100%
Rina 9/10 292 days 96%
edm 1/10 566 days 33%
Colin Barrow 9/10 627 days 78%
Pauline 6/10 780 days 57%
Megan 5/10 932 days 39%
Marjolaine Loitz 4/10 962 days 31%
Keli Knox 10/10 1297 days 21%
Yar 1/10 1511 days 4%
Pinocity 6/10 1876 days 4%
Helen Russell 10/10 2057 days 4%
NewZealander 10/10 2331 days 4%
Tommy Pickett 9/10 3154 days 2%
Tom Bennett 8/10 3158 days 2%
Jeny Smolders 9/10 3160 days 2%
Gregg Wagstaff 7/10 3385 days 1%
Lianne Ijlst 8/10 3413 days 1%
Samantha and Neis 8/10 3414 days 1%
Brandon Cassidy 7/10 3430 days 1%
Vic Baughen 9/10 3432 days 1%
Anders Frank 7/10 3436 days 1%
Dina Schurer 8/10 3437 days 1%
Kim Youngsub 9/10 3438 days 1%
DEBBIE LAMBERT 10/10 3442 days 1%
Gary Williams 8/10 3442 days 1%
Kimberley Gardien 8/10 3449 days 1%
Antoine 9/10 3470 days 1%
Judit Van lanen 9/10 3475 days 1%
Bjorn Nielsen 8/10 3477 days 1%
Joel Virtanen 9/10 3479 days 1%
Corbin Hure 7/10 3479 days 1%
Ron 6/10 3482 days 1%
Thomas Simeon 8/10 3482 days 1%
Suzannah Hill 8/10 3483 days 1%
Kallan Mrozek 9/10 3484 days 1%
Kees Mol 9/10 3488 days 1%
Kristal Lavender 10/10 3488 days 1%
Bastian Bley 9/10 3489 days 1%
Jasmine Rogers 3/10 3490 days 1%
Louis Nilsson 8/10 3494 days 1%
Tim 7/10 3494 days 1%
Jendrik 6/10 3494 days 1%
Katharina 7/10 3495 days 1%
Chris Valchero 9/10 3498 days 1%
Rulp Niet 8/10 3500 days 1%
Soeren Buchheister 9/10 3501 days 1%
Chas Bronson 8/10 3501 days 1%
Jakob Lovdahl 9/10 3503 days 1%
Alexandra Schmidt 10/10 3513 days 1%
Jade Williams 10/10 3514 days 1%
Sam Staines 10/10 3515 days 1%
Nickolas Jonkergouw 7/10 3519 days 1%
Kirsty Smith 10/10 3519 days 1%
Eva Hesse 10/10 3534 days 1%
celine gries 8/10 3534 days 1%
tinagermany111 8/10 3549 days 1%
Cassandra Geyer 8/10 3733 days 1%
Olivier Reculeau 8/10 3734 days 1%
Thomas Michel 5/10 3735 days 1%
Lisa Haedrich 5/10 3739 days 1%
Nadja Guiliani 8/10 3743 days 1%
Elbrich 8/10 3743 days 1%
Jamie Serieux 7/10 3746 days 1%
Adele Jacques 9/10 3747 days 1%
Daniel Weber 6/10 3749 days 1%
Emily Noyd 8/10 3751 days 1%
Aparna Gula 10/10 3752 days 1%
Sebastiaan 7/10 3754 days 1%
Andre 9/10 3755 days 1%
Benedikt Hang 7/10 3756 days 1%
Yannick 8/10 3756 days 1%
S Black 9/10 3757 days 1%
Paul Larauze 6/10 3760 days 1%
Florence 6/10 3761 days 1%
Sarah Kovacs 8/10 3762 days 1%
Frenziska Schmid 7/10 3764 days 1%
Maud Livolsi 7/10 3771 days 1%
Lewis Whittle 6/10 3773 days 1%
Lukas Seager 6/10 3773 days 1%
Andrea Tabaka 8/10 3780 days 1%
Tina Rust 8/10 3782 days 1%
Joel Papak 8/10 3784 days 1%
Clemence and Pedro 9/10 3785 days 1%
Doms Wahlelr 9/10 3787 days 1%
Josef Biller 8/10 3787 days 1%
Justine Hoffmann 8/10 3788 days 1%
Friederike East 7/10 3788 days 1%
Mark White 10/10 3789 days 1%
Briony 8/10 3792 days 1%
Gabriel Siibers 8/10 3792 days 1%
Henry Wichler 8/10 3793 days 1%
Kyle Johnson 9/10 3795 days 1%
Niels Wezenberg 7/10 3796 days 1%
John Hamilton 9/10 3796 days 1%
Brianna Burd 9/10 3796 days 1%
Jessica Ruhland 8/10 3797 days 1%
Stula Vladimir 10/10 3798 days 1%
Cosmo Hartuna 7/10 3800 days 1%
Roland Fischer 6/10 3800 days 1%
Ross Holmes 9/10 3801 days 1%
Tilman 9/10 3803 days 1%
Petru 7/10 3804 days 1%
Fero Saarinen 6/10 3805 days 1%
Lauren Thompson 8/10 3807 days 1%
Meilin 8/10 3810 days 1%
Jonas Hoerning 10/10 3814 days 1%
Vanesha Patel 6/10 3815 days 1%
Mauricio Daniele 9/10 3815 days 1%
Sara and Antoine 8/10 3817 days 1%
Clare Pickford 6/10 3817 days 1%
Daniel Hill 10/10 3818 days 1%
Moritz Braun 7/10 3834 days 1%
Grischa Rodust 8/10 3841 days 1%
Chalie Dotesek 9/10 3842 days 1%
Julien Lafeville 7/10 3846 days 1%
Julia Huesam 8/10 3846 days 1%
Alexandre 9/10 3850 days 1%
Kev Zarka 6/10 3851 days 0%
Markus Wabing 8/10 3854 days 1%
Gessica 6/10 3887 days 0%
Simon Quass 9/10 3891 days 1%
Barthelemy 7/10 4120 days 0%
Brita Topp 10/10 4463 days 1%
Laim Thompson 8/10 4463 days 1%
Adriana 10/10 4471 days 1%
Pavel Jarolimek 5/10 4471 days 0%
Leonie Moeller 6/10 4472 days 0%
Doreen Gendel 8/10 4473 days 1%
Carla Oyarzun 3/10 4476 days 0%
Paolo Cases 3/10 4476 days 0%
Wolfgang and Christine 8/10 4481 days 1%
Helen 8/10 4494 days 1%
Olivier Carval 9/10 4496 days 1%
Hirsch Svenja 9/10 4497 days 1%
Mahr Svenja 8/10 4497 days 1%
Anna Guzewiez 9/10 4513 days 1%
Pier Durand 8/10 4517 days 1%
Serena Poggioli 9/10 4517 days 1%
Wayne Schist 7/10 4517 days 1%
Margreth Lydie 5/10 4525 days 0%
Laura Pleumeekers 7/10 4539 days 1%
David Brooks 10/10 4542 days 1%
Adrien Godeloup 9/10 4551 days 1%
Bet Dreno 8/10 4552 days 1%
Joachim 1/10 4553 days 0%
Pioter Jurkowski 7/10 4553 days 1%
Thomas Roche 9/10 4555 days 1%
Brian 9/10 4614 days 1%
hendrik king 9/10 4737 days 1%
Kiki Wykstra 5/10 4847 days 0%
Galen Licht 4/10 4847 days 0%
Yu-Ti Chu 7/10 4850 days 1%
Ton Martens 7/10 4850 days 1%
Joshua Perry 8/10 4855 days 1%
Molly Ladd 8/10 4855 days 1%
Michael Nolan 9/10 4859 days 1%
Julian Roots 9/10 4859 days 1%
Florent Corino 9/10 4863 days 1%
Amiot Cyriane 7/10 4863 days 1%
Annika 7/10 4863 days 1%
Jonas Herrmann 7/10 4863 days 1%
Matthieu Daveou 8/10 4863 days 1%
Julien Panossian 6/10 4863 days 0%
Raoul Montestruer 5/10 4863 days 0%
Alessa Ndra 8/10 4869 days 1%
Bjorn Hedmark 5/10 4870 days 0%
Evyatar Tulipman 7/10 4872 days 1%
S Curry 10/10 4887 days 1%
Ingrid 9/10 4931 days 1%
Reinier Timmer 7/10 4931 days 1%
Moorman 8/10 4940 days 1%
Stefan Roth 9/10 4965 days 1%
David 9/10 4979 days 1%
kevindang 10/10 5132 days 1%
Ruben Kunze 4/10 5214 days 0%
Sebastian Hol 9/10 5220 days 1%
Dick Stewart 8/10 5229 days 1%
David Beaumont 9/10 5236 days 1%
Beyeler 10/10 5241 days 1%
Nikita Sue 9/10 5246 days 1%
Schweiger 10/10 5248 days 1%
Jan & Marian 10/10 5327 days 1%
Konny 9/10 5331 days 1%
Waldemar Schuler 8/10 5331 days 1%
jule 3/10 5345 days 0%
Jack Potman 8/10 5547 days 1%
Jon_and_Family 9/10 5559 days 1%
Walker 9/10 5562 days 1%
Andreas Blessing 10/10 5570 days 1%
Gema 7/10 5573 days 1%
Avry Fabrice 6/10 5578 days 0%
Diane Johnston 9/10 5583 days 1%
Javier Munoz 8/10 5583 days 1%
Ben Akin-Smith 8/10 5584 days 1%
K Wallis 9/10 5589 days 1%
khs 9/10 5590 days 1%
Emma Ducat 9/10 5590 days 1%
Mr and Mrs Lambert 8/10 5597 days 1%
Andrew Koster 7/10 5603 days 1%
Bakker 8/10 5603 days 1%
Kimberly St Louis 8/10 5604 days 1%
Roel Wesstra 8/10 5610 days 1%
Seifert 10/10 5610 days 1%
Derek Woodward 9/10 5612 days 1%
Fabi & Sabi 8/10 5613 days 1%
Rosey834 8/10 5680 days 1%
Pete & Chris 10/10 5880 days 1%
Tony Masters 9/10 5943 days 1%
Hershell 8/10 5947 days 1%
Mike Robinson 9/10 5948 days 1%
Brent S 2/10 5949 days 0%
Zara Leyden 9/10 5957 days 1%
Judith 7/10 5961 days 1%
anon 8/10 5962 days 1%
Pierre Pilon 8/10 5963 days 1%
Jenny Omb 1/10 5968 days 0%
Frei Urs 6/10 5969 days 0%
Bryan Keddie 9/10 5979 days 1%
Leanne Rogan 5/10 5979 days 0%
Joanne Clarke 8/10 5983 days 1%
Wolfgang G 9/10 5989 days 1%
Thomas Signes 7/10 6010 days 1%
menzel 10/10 6028 days 1%
graemeh1 9/10 6029 days 1%
klinger 10/10 6029 days 1%
gereldineb 8/10 6039 days 1%
jennyb 9/10 6043 days 1%
Frank de Voogd 8/10 6049 days 1%
Jean Paul Mesnage 9/10 6055 days 1%
Hansjoerg Ehrmann 5/10 6056 days 0%
Daniel Alonso 9/10 6057 days 1%
Nigel Petrie 9/10 6068 days 1%
Tracy & Peter Cassidy 8/10 6084 days 1%
miniappleses 8/10 6106 days 1%
Josie Boyle 7/10 6217 days 1%
JanneP 9/10 6287 days 1%
Mikey 9/10 6294 days 1%
SablotniD 7/10 6298 days 1%
WiebkeS 9/10 6305 days 1%
Tanya 5/10 6306 days 0%
Jan 6/10 6307 days 0%
Viola 8/10 6308 days 1%
RowanL 7/10 6309 days 1%
VickiEngland 8/10 6317 days 1%
TomC1 8/10 6322 days 1%
AndyK 9/10 6322 days 1%
TatiamT 9/10 6322 days 1%
GillianK 8/10 6324 days 1%
EelcoK 9/10 6324 days 1%
Michael 9/10 6328 days 1%
soccaplaya14 10/10 6329 days 1%
Eugene 7/10 6330 days 1%
John 6/10 6332 days 0%
Tony 8/10 6337 days 1%
Middleton 4/10 6338 days 0%
Elise 8/10 6339 days 1%
Marie 8/10 6340 days 1%
ThomasS1 10/10 6344 days 1%
RasmusB 4/10 6346 days 0%
Simon 8/10 6351 days 1%
Phil&Joe 10/10 6353 days 1%
Marcus 7/10 6354 days 1%
Andre 7/10 6355 days 1%
Iris 9/10 6357 days 1%
Carla 7/10 6357 days 1%
Sandra 8/10 6361 days 1%
Schaffluber 10/10 6362 days 1%
Hayley 5/10 6363 days 0%
Con 2/10 6407 days 0%
felix 7/10 6408 days 1%
melissa 10/10 6415 days 1%
John B 5/10 6417 days 0%
Gemma 7/10 6456 days 1%
Henry 7/10 6456 days 1%
Antonella 10/10 6464 days 1%
Michelle 8/10 6464 days 1%
Laura 7/10 6472 days 1%
Sarah 8/10 6487 days 1%
Katerina 7/10 6507 days 1%
Erin 3/10 6507 days 0%
Mike Knight 9/10 6528 days 1%
Bronagh Mcartan 8/10 6537 days 1%
Dave 8/10 6548 days 1%
fgregory 10/10 6551 days 1%
Rhea 6/10 6597 days 0%
Georgina Mulligan 8/10 6609 days 1%
Karen C 7/10 6621 days 1%
Edmund Hillstone 10/10 6638 days 1%
Toby 6/10 6661 days 0%
Jennifer Baulch 9/10 6665 days 1%
Susan 8/10 6669 days 1%
Hoetnagels 7/10 6672 days 1%
Alan Bellerby 8/10 6675 days 1%
Sanne Jonker 7/10 6676 days 1%
Renske Tehurne 8/10 6680 days 1%
Benjamin Krein 7/10 6680 days 1%
Anne and Derek 8/10 6681 days 1%
James Davies 7/10 6681 days 1%
Naomi Horton 8/10 6682 days 1%
Roger Repolusk 8/10 6686 days 1%
Tony Wicks 6/10 6686 days 0%
Nancy Dol 8/10 6686 days 1%
Kristine 10/10 6686 days 1%
Kathy Hawey 9/10 6688 days 1%
David Buckley 8/10 6689 days 1%
Lena1 6/10 6689 days 0%
John Woodrow 8/10 6690 days 1%
Carmen Dolny 10/10 6690 days 1%
Haemnerli 8/10 6694 days 1%
Carla 8/10 6701 days 1%
Jim Curley 8/10 6701 days 1%
paulonline 7/10 6707 days 1%
Bex 6/10 6716 days 0%
Jenny Hulsebosch 8/10 6717 days 1%
Melissa Steedman 8/10 6728 days 1%
Tim 7/10 6729 days 1%
Falk Seidel 7/10 6732 days 1%
Hans Olthof 8/10 6732 days 1%
Anu 9/10 6735 days 1%
Anneli 6/10 6737 days 0%
purplekat99 10/10 6745 days 1%
Connor 10/10 6758 days 1%
Ad 7/10 6758 days 1%
Ann Westmacott 5/10 6763 days 0%
Paul Cowie 8/10 6764 days 1%
Ewen Maclean 8/10 6764 days 1%
Sarah Wilton 5/10 6764 days 0%
Arend v Dyn 7/10 6766 days 1%
Linda 8/10 6770 days 1%
Fiona 7/10 6770 days 1%
Ann 7/10 6771 days 1%
ranker_584 9/10 6774 days 1%
Christine 7/10 6774 days 1%
Nina 9/10 6774 days 1%
Anthony 7/10 6779 days 1%
Tom Clements 7/10 6779 days 1%
ranker_46 8/10 6891 days 1%
Pat Brewster 8/10 6891 days 1%
FrankOosterwijk 6/10 6976 days 0%
Kim 8/10 6976 days 1%
Helen 7/10 7007 days 1%
Heather 9/10 7007 days 1%
Helene 9/10 7019 days 1%
John 7/10 7019 days 1%
Giancarlo 6/10 7019 days 0%
Annette 4/10 7043 days 0%
John 5/10 7043 days 0%
Duncan 9/10 7048 days 1%
Jen 4/10 7059 days 0%
Rolf 8/10 7067 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

-0.96% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 118 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 89 days. Adjustments are according to the following table.

Days Adjustment
… …
86 -0.93%
87 -0.94%
88 -0.95%
89 -0.96%
90 -0.97%
91 -0.98%
92 -0.99%
… …

Balancing Adjustment

8.17% 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

76%

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.