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Ranking Score Explained

Kia ora, 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

69.05%

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 2/10 252 days 46%
Nico 1/10 252 days 41%
Ruban K 1/10 280 days 41%
Maria Longstaff 10/10 311 days 100%
Rina 9/10 433 days 94%
edm 1/10 707 days 31%
Colin Barrow 9/10 768 days 69%
Pauline 6/10 921 days 47%
Megan 5/10 1073 days 30%
Marjolaine Loitz 4/10 1103 days 24%
Keli Knox 10/10 1438 days 14%
Yar 1/10 1652 days 3%
Pinocity 6/10 2017 days 4%
Helen Russell 10/10 2198 days 4%
NewZealander 10/10 2472 days 4%
Tommy Pickett 9/10 3295 days 2%
Tom Bennett 8/10 3299 days 2%
Jeny Smolders 9/10 3301 days 2%
Gregg Wagstaff 7/10 3526 days 1%
Lianne Ijlst 8/10 3554 days 1%
Samantha and Neis 8/10 3555 days 1%
Brandon Cassidy 7/10 3571 days 1%
Vic Baughen 9/10 3573 days 1%
Anders Frank 7/10 3577 days 1%
Dina Schurer 8/10 3578 days 1%
Kim Youngsub 9/10 3579 days 1%
DEBBIE LAMBERT 10/10 3583 days 1%
Gary Williams 8/10 3583 days 1%
Kimberley Gardien 8/10 3590 days 1%
Antoine 9/10 3611 days 1%
Judit Van lanen 9/10 3616 days 1%
Bjorn Nielsen 8/10 3618 days 1%
Joel Virtanen 9/10 3620 days 1%
Corbin Hure 7/10 3620 days 1%
Ron 6/10 3623 days 1%
Thomas Simeon 8/10 3623 days 1%
Suzannah Hill 8/10 3624 days 1%
Kallan Mrozek 9/10 3625 days 1%
Kees Mol 9/10 3629 days 1%
Kristal Lavender 10/10 3629 days 1%
Bastian Bley 9/10 3630 days 1%
Jasmine Rogers 3/10 3631 days 1%
Louis Nilsson 8/10 3635 days 1%
Tim 7/10 3635 days 1%
Jendrik 6/10 3635 days 1%
Katharina 7/10 3636 days 1%
Chris Valchero 9/10 3639 days 1%
Rulp Niet 8/10 3641 days 1%
Soeren Buchheister 9/10 3642 days 1%
Chas Bronson 8/10 3642 days 1%
Jakob Lovdahl 9/10 3644 days 1%
Alexandra Schmidt 10/10 3654 days 1%
Jade Williams 10/10 3655 days 1%
Sam Staines 10/10 3656 days 1%
Nickolas Jonkergouw 7/10 3660 days 1%
Kirsty Smith 10/10 3660 days 1%
Eva Hesse 10/10 3675 days 1%
celine gries 8/10 3675 days 1%
tinagermany111 8/10 3690 days 1%
Cassandra Geyer 8/10 3874 days 1%
Olivier Reculeau 8/10 3875 days 1%
Thomas Michel 5/10 3876 days 1%
Lisa Haedrich 5/10 3880 days 1%
Nadja Guiliani 8/10 3884 days 1%
Elbrich 8/10 3884 days 1%
Jamie Serieux 7/10 3887 days 1%
Adele Jacques 9/10 3888 days 1%
Daniel Weber 6/10 3890 days 1%
Emily Noyd 8/10 3892 days 1%
Aparna Gula 10/10 3893 days 1%
Sebastiaan 7/10 3895 days 1%
Andre 9/10 3896 days 1%
Benedikt Hang 7/10 3897 days 1%
Yannick 8/10 3897 days 1%
S Black 9/10 3898 days 1%
Paul Larauze 6/10 3901 days 1%
Florence 6/10 3902 days 1%
Sarah Kovacs 8/10 3903 days 1%
Frenziska Schmid 7/10 3905 days 1%
Maud Livolsi 7/10 3912 days 1%
Lewis Whittle 6/10 3914 days 1%
Lukas Seager 6/10 3914 days 1%
Andrea Tabaka 8/10 3921 days 1%
Tina Rust 8/10 3923 days 1%
Joel Papak 8/10 3925 days 1%
Clemence and Pedro 9/10 3926 days 1%
Doms Wahlelr 9/10 3928 days 1%
Josef Biller 8/10 3928 days 1%
Justine Hoffmann 8/10 3929 days 1%
Friederike East 7/10 3929 days 1%
Mark White 10/10 3930 days 1%
Briony 8/10 3933 days 1%
Gabriel Siibers 8/10 3933 days 1%
Henry Wichler 8/10 3934 days 1%
Kyle Johnson 9/10 3936 days 1%
Niels Wezenberg 7/10 3937 days 1%
John Hamilton 9/10 3937 days 1%
Brianna Burd 9/10 3937 days 1%
Jessica Ruhland 8/10 3938 days 1%
Stula Vladimir 10/10 3939 days 1%
Cosmo Hartuna 7/10 3941 days 1%
Roland Fischer 6/10 3941 days 1%
Ross Holmes 9/10 3942 days 1%
Tilman 9/10 3944 days 1%
Petru 7/10 3945 days 1%
Fero Saarinen 6/10 3946 days 1%
Lauren Thompson 8/10 3948 days 1%
Meilin 8/10 3951 days 1%
Jonas Hoerning 10/10 3955 days 1%
Vanesha Patel 6/10 3956 days 1%
Mauricio Daniele 9/10 3956 days 1%
Sara and Antoine 8/10 3958 days 1%
Clare Pickford 6/10 3958 days 1%
Daniel Hill 10/10 3959 days 1%
Moritz Braun 7/10 3975 days 1%
Grischa Rodust 8/10 3982 days 1%
Chalie Dotesek 9/10 3983 days 1%
Julien Lafeville 7/10 3987 days 1%
Julia Huesam 8/10 3987 days 1%
Alexandre 9/10 3991 days 1%
Kev Zarka 6/10 3992 days 0%
Markus Wabing 8/10 3995 days 1%
Gessica 6/10 4028 days 0%
Simon Quass 9/10 4032 days 0%
Barthelemy 7/10 4261 days 0%
Brita Topp 10/10 4604 days 1%
Laim Thompson 8/10 4604 days 1%
Adriana 10/10 4612 days 1%
Pavel Jarolimek 5/10 4612 days 1%
Leonie Moeller 6/10 4613 days 1%
Doreen Gendel 8/10 4614 days 1%
Carla Oyarzun 3/10 4617 days 0%
Paolo Cases 3/10 4617 days 0%
Wolfgang and Christine 8/10 4622 days 1%
Helen 8/10 4635 days 1%
Olivier Carval 9/10 4637 days 1%
Hirsch Svenja 9/10 4638 days 1%
Mahr Svenja 8/10 4638 days 1%
Anna Guzewiez 9/10 4654 days 1%
Pier Durand 8/10 4658 days 1%
Serena Poggioli 9/10 4658 days 1%
Wayne Schist 7/10 4658 days 1%
Margreth Lydie 5/10 4666 days 1%
Laura Pleumeekers 7/10 4680 days 1%
David Brooks 10/10 4683 days 1%
Adrien Godeloup 9/10 4692 days 1%
Bet Dreno 8/10 4693 days 1%
Joachim 1/10 4694 days 0%
Pioter Jurkowski 7/10 4694 days 1%
Thomas Roche 9/10 4696 days 1%
Brian 9/10 4755 days 1%
hendrik king 9/10 4878 days 1%
Kiki Wykstra 5/10 4988 days 1%
Galen Licht 4/10 4988 days 0%
Yu-Ti Chu 7/10 4991 days 1%
Ton Martens 7/10 4991 days 1%
Joshua Perry 8/10 4996 days 1%
Molly Ladd 8/10 4996 days 1%
Michael Nolan 9/10 5000 days 1%
Julian Roots 9/10 5000 days 1%
Florent Corino 9/10 5004 days 1%
Amiot Cyriane 7/10 5004 days 1%
Annika 7/10 5004 days 1%
Jonas Herrmann 7/10 5004 days 1%
Matthieu Daveou 8/10 5004 days 1%
Julien Panossian 6/10 5004 days 1%
Raoul Montestruer 5/10 5004 days 1%
Alessa Ndra 8/10 5010 days 1%
Bjorn Hedmark 5/10 5011 days 1%
Evyatar Tulipman 7/10 5013 days 1%
S Curry 10/10 5028 days 1%
Ingrid 9/10 5072 days 1%
Reinier Timmer 7/10 5072 days 1%
Moorman 8/10 5081 days 1%
Stefan Roth 9/10 5106 days 1%
David 9/10 5120 days 1%
kevindang 10/10 5273 days 1%
Ruben Kunze 4/10 5355 days 0%
Sebastian Hol 9/10 5361 days 1%
Dick Stewart 8/10 5370 days 1%
David Beaumont 9/10 5377 days 1%
Beyeler 10/10 5382 days 1%
Nikita Sue 9/10 5387 days 1%
Schweiger 10/10 5389 days 1%
Jan & Marian 10/10 5468 days 1%
Konny 9/10 5472 days 1%
Waldemar Schuler 8/10 5472 days 1%
jule 3/10 5486 days 0%
Jack Potman 8/10 5688 days 1%
Jon_and_Family 9/10 5700 days 1%
Walker 9/10 5703 days 1%
Andreas Blessing 10/10 5711 days 1%
Gema 7/10 5714 days 1%
Avry Fabrice 6/10 5719 days 1%
Diane Johnston 9/10 5724 days 1%
Javier Munoz 8/10 5724 days 1%
Ben Akin-Smith 8/10 5725 days 1%
K Wallis 9/10 5730 days 1%
khs 9/10 5731 days 1%
Emma Ducat 9/10 5731 days 1%
Mr and Mrs Lambert 8/10 5738 days 1%
Andrew Koster 7/10 5744 days 1%
Bakker 8/10 5744 days 1%
Kimberly St Louis 8/10 5745 days 1%
Roel Wesstra 8/10 5751 days 1%
Seifert 10/10 5751 days 1%
Derek Woodward 9/10 5753 days 1%
Fabi & Sabi 8/10 5754 days 1%
Rosey834 8/10 5821 days 1%
Pete & Chris 10/10 6021 days 1%
Tony Masters 9/10 6084 days 1%
Hershell 8/10 6088 days 1%
Mike Robinson 9/10 6089 days 1%
Brent S 2/10 6090 days 0%
Zara Leyden 9/10 6098 days 1%
Judith 7/10 6102 days 1%
anon 8/10 6103 days 1%
Pierre Pilon 8/10 6104 days 1%
Jenny Omb 1/10 6109 days 0%
Frei Urs 6/10 6110 days 1%
Bryan Keddie 9/10 6120 days 1%
Leanne Rogan 5/10 6120 days 1%
Joanne Clarke 8/10 6124 days 1%
Wolfgang G 9/10 6130 days 1%
Thomas Signes 7/10 6151 days 1%
menzel 10/10 6169 days 1%
graemeh1 9/10 6170 days 1%
klinger 10/10 6170 days 1%
gereldineb 8/10 6180 days 1%
jennyb 9/10 6184 days 1%
Frank de Voogd 8/10 6190 days 1%
Jean Paul Mesnage 9/10 6196 days 1%
Hansjoerg Ehrmann 5/10 6197 days 1%
Daniel Alonso 9/10 6198 days 1%
Nigel Petrie 9/10 6209 days 1%
Tracy & Peter Cassidy 8/10 6225 days 1%
miniappleses 8/10 6247 days 1%
Josie Boyle 7/10 6358 days 1%
JanneP 9/10 6428 days 1%
Mikey 9/10 6435 days 1%
SablotniD 7/10 6440 days 1%
WiebkeS 9/10 6446 days 1%
Tanya 5/10 6447 days 1%
Jan 6/10 6448 days 1%
Viola 8/10 6449 days 1%
RowanL 7/10 6450 days 1%
VickiEngland 8/10 6458 days 1%
TomC1 8/10 6463 days 1%
AndyK 9/10 6463 days 1%
TatiamT 9/10 6463 days 1%
GillianK 8/10 6465 days 1%
EelcoK 9/10 6465 days 1%
Michael 9/10 6469 days 1%
soccaplaya14 10/10 6470 days 1%
Eugene 7/10 6471 days 1%
John 6/10 6473 days 1%
Tony 8/10 6478 days 1%
Middleton 4/10 6479 days 0%
Elise 8/10 6481 days 1%
Marie 8/10 6481 days 1%
ThomasS1 10/10 6485 days 1%
RasmusB 4/10 6487 days 0%
Simon 8/10 6492 days 1%
Phil&Joe 10/10 6495 days 1%
Marcus 7/10 6495 days 1%
Andre 7/10 6496 days 1%
Iris 9/10 6498 days 1%
Carla 7/10 6498 days 1%
Sandra 8/10 6502 days 1%
Schaffluber 10/10 6503 days 1%
Hayley 5/10 6504 days 1%
Con 2/10 6548 days 0%
felix 7/10 6549 days 1%
melissa 10/10 6556 days 1%
John B 5/10 6558 days 1%
Gemma 7/10 6597 days 1%
Henry 7/10 6597 days 1%
Antonella 10/10 6605 days 1%
Michelle 8/10 6605 days 1%
Laura 7/10 6613 days 1%
Sarah 8/10 6628 days 1%
Katerina 7/10 6648 days 1%
Erin 3/10 6649 days 0%
Mike Knight 9/10 6670 days 1%
Bronagh Mcartan 8/10 6678 days 1%
Dave 8/10 6689 days 1%
fgregory 10/10 6693 days 1%
Rhea 6/10 6738 days 1%
Georgina Mulligan 8/10 6750 days 1%
Karen C 7/10 6762 days 1%
Edmund Hillstone 10/10 6779 days 1%
Toby 6/10 6802 days 1%
Jennifer Baulch 9/10 6806 days 1%
Susan 8/10 6810 days 1%
Hoetnagels 7/10 6813 days 1%
Alan Bellerby 8/10 6816 days 1%
Sanne Jonker 7/10 6817 days 1%
Renske Tehurne 8/10 6821 days 1%
Benjamin Krein 7/10 6821 days 1%
Anne and Derek 8/10 6822 days 1%
James Davies 7/10 6822 days 1%
Naomi Horton 8/10 6823 days 1%
Roger Repolusk 8/10 6827 days 1%
Tony Wicks 6/10 6827 days 1%
Nancy Dol 8/10 6827 days 1%
Kristine 10/10 6827 days 1%
Kathy Hawey 9/10 6829 days 1%
David Buckley 8/10 6830 days 1%
Lena1 6/10 6830 days 1%
John Woodrow 8/10 6831 days 1%
Carmen Dolny 10/10 6831 days 1%
Haemnerli 8/10 6835 days 1%
Carla 8/10 6842 days 1%
Jim Curley 8/10 6842 days 1%
paulonline 7/10 6848 days 1%
Bex 6/10 6857 days 1%
Jenny Hulsebosch 8/10 6858 days 1%
Melissa Steedman 8/10 6869 days 1%
Tim 7/10 6870 days 1%
Falk Seidel 7/10 6873 days 1%
Hans Olthof 8/10 6873 days 1%
Anu 9/10 6876 days 1%
Anneli 6/10 6878 days 1%
purplekat99 10/10 6886 days 1%
Connor 10/10 6899 days 1%
Ad 7/10 6899 days 1%
Ann Westmacott 5/10 6904 days 1%
Paul Cowie 8/10 6905 days 1%
Ewen Maclean 8/10 6905 days 1%
Sarah Wilton 5/10 6905 days 1%
Arend v Dyn 7/10 6907 days 1%
Linda 8/10 6911 days 1%
Fiona 7/10 6911 days 1%
Ann 7/10 6912 days 1%
ranker_584 9/10 6915 days 1%
Christine 7/10 6915 days 1%
Nina 9/10 6915 days 1%
Anthony 7/10 6920 days 1%
Tom Clements 7/10 6920 days 1%
ranker_46 8/10 7032 days 1%
Pat Brewster 8/10 7032 days 1%
FrankOosterwijk 6/10 7117 days 1%
Kim 8/10 7117 days 1%
Helen 7/10 7148 days 1%
Heather 9/10 7148 days 1%
Helene 9/10 7160 days 1%
John 7/10 7160 days 1%
Giancarlo 6/10 7160 days 1%
Annette 4/10 7184 days 0%
John 5/10 7184 days 1%
Duncan 9/10 7189 days 1%
Jen 4/10 7200 days 0%
Rolf 8/10 7208 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

-3.94% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 47 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 -3.88%
198 -3.90%
199 -3.92%
200 -3.94%
201 -3.96%
202 -3.98%
203 -4.00%
… …

Balancing Adjustment

10.14% 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

75%

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.