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Ranking Score Explained

Hi, 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

69.01%

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 2/10 169 days 46%
Nico 1/10 169 days 41%
Ruban K 1/10 197 days 41%
Maria Longstaff 10/10 228 days 100%
Rina 9/10 350 days 95%
edm 1/10 624 days 32%
Colin Barrow 9/10 685 days 75%
Pauline 6/10 838 days 53%
Megan 5/10 990 days 35%
Marjolaine Loitz 4/10 1020 days 28%
Keli Knox 10/10 1355 days 18%
Yar 1/10 1569 days 3%
Pinocity 6/10 1934 days 4%
Helen Russell 10/10 2115 days 4%
NewZealander 10/10 2389 days 4%
Tommy Pickett 9/10 3212 days 2%
Tom Bennett 8/10 3216 days 2%
Jeny Smolders 9/10 3218 days 2%
Gregg Wagstaff 7/10 3443 days 1%
Lianne Ijlst 8/10 3471 days 1%
Samantha and Neis 8/10 3472 days 1%
Brandon Cassidy 7/10 3488 days 1%
Vic Baughen 9/10 3490 days 1%
Anders Frank 7/10 3494 days 1%
Dina Schurer 8/10 3495 days 1%
Kim Youngsub 9/10 3496 days 1%
DEBBIE LAMBERT 10/10 3500 days 1%
Gary Williams 8/10 3500 days 1%
Kimberley Gardien 8/10 3507 days 1%
Antoine 9/10 3528 days 1%
Judit Van lanen 9/10 3533 days 1%
Bjorn Nielsen 8/10 3535 days 1%
Joel Virtanen 9/10 3537 days 1%
Corbin Hure 7/10 3537 days 1%
Ron 6/10 3540 days 1%
Thomas Simeon 8/10 3540 days 1%
Suzannah Hill 8/10 3541 days 1%
Kallan Mrozek 9/10 3542 days 1%
Kees Mol 9/10 3546 days 1%
Kristal Lavender 10/10 3546 days 1%
Bastian Bley 9/10 3547 days 1%
Jasmine Rogers 3/10 3548 days 1%
Louis Nilsson 8/10 3552 days 1%
Tim 7/10 3552 days 1%
Jendrik 6/10 3552 days 1%
Katharina 7/10 3553 days 1%
Chris Valchero 9/10 3556 days 1%
Rulp Niet 8/10 3558 days 1%
Soeren Buchheister 9/10 3559 days 1%
Chas Bronson 8/10 3559 days 1%
Jakob Lovdahl 9/10 3561 days 1%
Alexandra Schmidt 10/10 3571 days 1%
Jade Williams 10/10 3572 days 1%
Sam Staines 10/10 3573 days 1%
Nickolas Jonkergouw 7/10 3577 days 1%
Kirsty Smith 10/10 3577 days 1%
Eva Hesse 10/10 3592 days 1%
celine gries 8/10 3592 days 1%
tinagermany111 8/10 3606 days 1%
Cassandra Geyer 8/10 3791 days 1%
Olivier Reculeau 8/10 3792 days 1%
Thomas Michel 5/10 3793 days 1%
Lisa Haedrich 5/10 3797 days 1%
Nadja Guiliani 8/10 3801 days 1%
Elbrich 8/10 3801 days 1%
Jamie Serieux 7/10 3804 days 1%
Adele Jacques 9/10 3805 days 1%
Daniel Weber 6/10 3807 days 1%
Emily Noyd 8/10 3809 days 1%
Aparna Gula 10/10 3810 days 1%
Sebastiaan 7/10 3812 days 1%
Andre 9/10 3813 days 1%
Benedikt Hang 7/10 3814 days 1%
Yannick 8/10 3814 days 1%
S Black 9/10 3815 days 1%
Paul Larauze 6/10 3818 days 1%
Florence 6/10 3819 days 1%
Sarah Kovacs 8/10 3820 days 1%
Frenziska Schmid 7/10 3822 days 1%
Maud Livolsi 7/10 3829 days 1%
Lewis Whittle 6/10 3831 days 1%
Lukas Seager 6/10 3831 days 1%
Andrea Tabaka 8/10 3838 days 1%
Tina Rust 8/10 3840 days 1%
Joel Papak 8/10 3842 days 1%
Clemence and Pedro 9/10 3843 days 1%
Doms Wahlelr 9/10 3845 days 1%
Josef Biller 8/10 3845 days 1%
Justine Hoffmann 8/10 3846 days 1%
Friederike East 7/10 3846 days 1%
Mark White 10/10 3847 days 1%
Briony 8/10 3850 days 1%
Gabriel Siibers 8/10 3850 days 1%
Henry Wichler 8/10 3851 days 1%
Kyle Johnson 9/10 3853 days 1%
Niels Wezenberg 7/10 3854 days 1%
John Hamilton 9/10 3854 days 1%
Brianna Burd 9/10 3854 days 1%
Jessica Ruhland 8/10 3855 days 1%
Stula Vladimir 10/10 3856 days 1%
Cosmo Hartuna 7/10 3858 days 1%
Roland Fischer 6/10 3858 days 1%
Ross Holmes 9/10 3859 days 1%
Tilman 9/10 3861 days 1%
Petru 7/10 3862 days 1%
Fero Saarinen 6/10 3863 days 1%
Lauren Thompson 8/10 3865 days 1%
Meilin 8/10 3868 days 1%
Jonas Hoerning 10/10 3872 days 1%
Vanesha Patel 6/10 3873 days 1%
Mauricio Daniele 9/10 3873 days 1%
Sara and Antoine 8/10 3875 days 1%
Clare Pickford 6/10 3875 days 1%
Daniel Hill 10/10 3876 days 1%
Moritz Braun 7/10 3892 days 1%
Grischa Rodust 8/10 3899 days 1%
Chalie Dotesek 9/10 3900 days 1%
Julien Lafeville 7/10 3904 days 1%
Julia Huesam 8/10 3904 days 1%
Alexandre 9/10 3908 days 1%
Kev Zarka 6/10 3909 days 0%
Markus Wabing 8/10 3912 days 1%
Gessica 6/10 3945 days 0%
Simon Quass 9/10 3949 days 0%
Barthelemy 7/10 4178 days 0%
Brita Topp 10/10 4521 days 1%
Laim Thompson 8/10 4521 days 1%
Adriana 10/10 4529 days 1%
Pavel Jarolimek 5/10 4529 days 0%
Leonie Moeller 6/10 4530 days 1%
Doreen Gendel 8/10 4531 days 1%
Carla Oyarzun 3/10 4534 days 0%
Paolo Cases 3/10 4534 days 0%
Wolfgang and Christine 8/10 4539 days 1%
Helen 8/10 4552 days 1%
Olivier Carval 9/10 4554 days 1%
Hirsch Svenja 9/10 4555 days 1%
Mahr Svenja 8/10 4555 days 1%
Anna Guzewiez 9/10 4571 days 1%
Pier Durand 8/10 4575 days 1%
Serena Poggioli 9/10 4575 days 1%
Wayne Schist 7/10 4575 days 1%
Margreth Lydie 5/10 4583 days 0%
Laura Pleumeekers 7/10 4597 days 1%
David Brooks 10/10 4600 days 1%
Adrien Godeloup 9/10 4609 days 1%
Bet Dreno 8/10 4610 days 1%
Joachim 1/10 4611 days 0%
Pioter Jurkowski 7/10 4611 days 1%
Thomas Roche 9/10 4613 days 1%
Brian 9/10 4672 days 1%
hendrik king 9/10 4795 days 1%
Kiki Wykstra 5/10 4905 days 0%
Galen Licht 4/10 4905 days 0%
Yu-Ti Chu 7/10 4908 days 1%
Ton Martens 7/10 4908 days 1%
Joshua Perry 8/10 4913 days 1%
Molly Ladd 8/10 4913 days 1%
Michael Nolan 9/10 4917 days 1%
Julian Roots 9/10 4917 days 1%
Florent Corino 9/10 4921 days 1%
Amiot Cyriane 7/10 4921 days 1%
Annika 7/10 4921 days 1%
Jonas Herrmann 7/10 4921 days 1%
Matthieu Daveou 8/10 4921 days 1%
Julien Panossian 6/10 4921 days 1%
Raoul Montestruer 5/10 4921 days 0%
Alessa Ndra 8/10 4927 days 1%
Bjorn Hedmark 5/10 4928 days 0%
Evyatar Tulipman 7/10 4930 days 1%
S Curry 10/10 4945 days 1%
Ingrid 9/10 4989 days 1%
Reinier Timmer 7/10 4989 days 1%
Moorman 8/10 4998 days 1%
Stefan Roth 9/10 5023 days 1%
David 9/10 5037 days 1%
kevindang 10/10 5190 days 1%
Ruben Kunze 4/10 5272 days 0%
Sebastian Hol 9/10 5278 days 1%
Dick Stewart 8/10 5287 days 1%
David Beaumont 9/10 5294 days 1%
Beyeler 10/10 5299 days 1%
Nikita Sue 9/10 5304 days 1%
Schweiger 10/10 5306 days 1%
Jan & Marian 10/10 5385 days 1%
Konny 9/10 5389 days 1%
Waldemar Schuler 8/10 5389 days 1%
jule 3/10 5403 days 0%
Jack Potman 8/10 5605 days 1%
Jon_and_Family 9/10 5617 days 1%
Walker 9/10 5620 days 1%
Andreas Blessing 10/10 5628 days 1%
Gema 7/10 5631 days 1%
Avry Fabrice 6/10 5636 days 1%
Diane Johnston 9/10 5641 days 1%
Javier Munoz 8/10 5641 days 1%
Ben Akin-Smith 8/10 5642 days 1%
K Wallis 9/10 5647 days 1%
khs 9/10 5648 days 1%
Emma Ducat 9/10 5648 days 1%
Mr and Mrs Lambert 8/10 5655 days 1%
Andrew Koster 7/10 5661 days 1%
Bakker 8/10 5661 days 1%
Kimberly St Louis 8/10 5662 days 1%
Roel Wesstra 8/10 5668 days 1%
Seifert 10/10 5668 days 1%
Derek Woodward 9/10 5670 days 1%
Fabi & Sabi 8/10 5671 days 1%
Rosey834 8/10 5738 days 1%
Pete & Chris 10/10 5938 days 1%
Tony Masters 9/10 6001 days 1%
Hershell 8/10 6005 days 1%
Mike Robinson 9/10 6006 days 1%
Brent S 2/10 6007 days 0%
Zara Leyden 9/10 6015 days 1%
Judith 7/10 6019 days 1%
anon 8/10 6020 days 1%
Pierre Pilon 8/10 6021 days 1%
Jenny Omb 1/10 6026 days 0%
Frei Urs 6/10 6027 days 1%
Bryan Keddie 9/10 6037 days 1%
Leanne Rogan 5/10 6037 days 0%
Joanne Clarke 8/10 6041 days 1%
Wolfgang G 9/10 6047 days 1%
Thomas Signes 7/10 6068 days 1%
menzel 10/10 6086 days 1%
graemeh1 9/10 6087 days 1%
klinger 10/10 6087 days 1%
gereldineb 8/10 6097 days 1%
jennyb 9/10 6101 days 1%
Frank de Voogd 8/10 6107 days 1%
Jean Paul Mesnage 9/10 6113 days 1%
Hansjoerg Ehrmann 5/10 6114 days 0%
Daniel Alonso 9/10 6115 days 1%
Nigel Petrie 9/10 6126 days 1%
Tracy & Peter Cassidy 8/10 6142 days 1%
miniappleses 8/10 6164 days 1%
Josie Boyle 7/10 6275 days 1%
JanneP 9/10 6345 days 1%
Mikey 9/10 6352 days 1%
SablotniD 7/10 6356 days 1%
WiebkeS 9/10 6363 days 1%
Tanya 5/10 6364 days 0%
Jan 6/10 6364 days 1%
Viola 8/10 6366 days 1%
RowanL 7/10 6367 days 1%
VickiEngland 8/10 6375 days 1%
TomC1 8/10 6380 days 1%
AndyK 9/10 6380 days 1%
TatiamT 9/10 6380 days 1%
GillianK 8/10 6382 days 1%
EelcoK 9/10 6382 days 1%
Michael 9/10 6386 days 1%
soccaplaya14 10/10 6387 days 1%
Eugene 7/10 6388 days 1%
John 6/10 6390 days 1%
Tony 8/10 6395 days 1%
Middleton 4/10 6396 days 0%
Elise 8/10 6397 days 1%
Marie 8/10 6397 days 1%
ThomasS1 10/10 6402 days 1%
RasmusB 4/10 6404 days 0%
Simon 8/10 6409 days 1%
Phil&Joe 10/10 6411 days 1%
Marcus 7/10 6411 days 1%
Andre 7/10 6413 days 1%
Iris 9/10 6415 days 1%
Carla 7/10 6415 days 1%
Sandra 8/10 6419 days 1%
Schaffluber 10/10 6420 days 1%
Hayley 5/10 6421 days 0%
Con 2/10 6465 days 0%
felix 7/10 6466 days 1%
melissa 10/10 6472 days 1%
John B 5/10 6475 days 0%
Gemma 7/10 6513 days 1%
Henry 7/10 6514 days 1%
Antonella 10/10 6521 days 1%
Michelle 8/10 6521 days 1%
Laura 7/10 6530 days 1%
Sarah 8/10 6544 days 1%
Katerina 7/10 6565 days 1%
Erin 3/10 6565 days 0%
Mike Knight 9/10 6586 days 1%
Bronagh Mcartan 8/10 6595 days 1%
Dave 8/10 6606 days 1%
fgregory 10/10 6609 days 1%
Rhea 6/10 6655 days 1%
Georgina Mulligan 8/10 6667 days 1%
Karen C 7/10 6679 days 1%
Edmund Hillstone 10/10 6696 days 1%
Toby 6/10 6719 days 1%
Jennifer Baulch 9/10 6723 days 1%
Susan 8/10 6727 days 1%
Hoetnagels 7/10 6730 days 1%
Alan Bellerby 8/10 6733 days 1%
Sanne Jonker 7/10 6734 days 1%
Renske Tehurne 8/10 6738 days 1%
Benjamin Krein 7/10 6738 days 1%
Anne and Derek 8/10 6739 days 1%
James Davies 7/10 6739 days 1%
Naomi Horton 8/10 6740 days 1%
Roger Repolusk 8/10 6744 days 1%
Tony Wicks 6/10 6744 days 1%
Nancy Dol 8/10 6744 days 1%
Kristine 10/10 6744 days 1%
Kathy Hawey 9/10 6746 days 1%
David Buckley 8/10 6747 days 1%
Lena1 6/10 6747 days 1%
John Woodrow 8/10 6748 days 1%
Carmen Dolny 10/10 6748 days 1%
Haemnerli 8/10 6752 days 1%
Carla 8/10 6759 days 1%
Jim Curley 8/10 6759 days 1%
paulonline 7/10 6765 days 1%
Bex 6/10 6774 days 1%
Jenny Hulsebosch 8/10 6775 days 1%
Melissa Steedman 8/10 6786 days 1%
Tim 7/10 6787 days 1%
Falk Seidel 7/10 6790 days 1%
Hans Olthof 8/10 6790 days 1%
Anu 9/10 6793 days 1%
Anneli 6/10 6795 days 1%
purplekat99 10/10 6803 days 1%
Connor 10/10 6816 days 1%
Ad 7/10 6816 days 1%
Ann Westmacott 5/10 6821 days 0%
Paul Cowie 8/10 6822 days 1%
Ewen Maclean 8/10 6822 days 1%
Sarah Wilton 5/10 6822 days 0%
Arend v Dyn 7/10 6824 days 1%
Linda 8/10 6828 days 1%
Fiona 7/10 6828 days 1%
Ann 7/10 6829 days 1%
ranker_584 9/10 6832 days 1%
Christine 7/10 6832 days 1%
Nina 9/10 6832 days 1%
Anthony 7/10 6837 days 1%
Tom Clements 7/10 6837 days 1%
ranker_46 8/10 6949 days 1%
Pat Brewster 8/10 6949 days 1%
FrankOosterwijk 6/10 7034 days 1%
Kim 8/10 7034 days 1%
Helen 7/10 7065 days 1%
Heather 9/10 7065 days 1%
Helene 9/10 7077 days 1%
John 7/10 7077 days 1%
Giancarlo 6/10 7077 days 1%
Annette 4/10 7101 days 0%
John 5/10 7101 days 0%
Duncan 9/10 7106 days 1%
Jen 4/10 7117 days 0%
Rolf 8/10 7125 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

-1.71% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 112 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 147 days. Adjustments are according to the following table.

Days Adjustment
… …
144 -1.68%
145 -1.69%
146 -1.70%
147 -1.71%
148 -1.72%
149 -1.73%
150 -1.75%
… …

Balancing Adjustment

8.64% 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.