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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

348 Valid Reviews

The Interislander Ferry experience has a total of 359 reviews. There are 348 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 348 valid reviews:

Rating Count Percentage
10/10 40
11%
9/10 80
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%

77.10% Average

The raw data average (mean) for all the Interislander Ferry valid reviews is 77.10% and is based on 348 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 348 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

71.25%

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
edm 1/10 144 days 41%
Colin Barrow 9/10 205 days 100%
Pauline 6/10 358 days 83%
Megan 5/10 510 days 67%
Marjolaine Loitz 4/10 540 days 56%
Keli Knox 10/10 875 days 58%
Yar 1/10 1089 days 15%
Pinocity 6/10 1454 days 11%
Helen Russell 10/10 1635 days 7%
NewZealander 10/10 1909 days 5%
Tommy Pickett 9/10 2732 days 3%
Tom Bennett 8/10 2736 days 3%
Jeny Smolders 9/10 2738 days 3%
Gregg Wagstaff 7/10 2963 days 3%
Lianne Ijlst 8/10 2991 days 3%
Samantha and Neis 8/10 2992 days 3%
Brandon Cassidy 7/10 3008 days 2%
Vic Baughen 9/10 3010 days 3%
Anders Frank 7/10 3014 days 2%
Dina Schurer 8/10 3015 days 3%
Kim Youngsub 9/10 3016 days 3%
DEBBIE LAMBERT 10/10 3020 days 3%
Gary Williams 8/10 3020 days 3%
Kimberley Gardien 8/10 3027 days 3%
Antoine 9/10 3048 days 3%
Judit Van lanen 9/10 3053 days 3%
Bjorn Nielsen 8/10 3055 days 3%
Joel Virtanen 9/10 3057 days 3%
Corbin Hure 7/10 3057 days 2%
Ron 6/10 3060 days 2%
Thomas Simeon 8/10 3060 days 2%
Suzannah Hill 8/10 3061 days 2%
Kallan Mrozek 9/10 3062 days 3%
Kees Mol 9/10 3066 days 3%
Kristal Lavender 10/10 3066 days 3%
Bastian Bley 9/10 3067 days 3%
Jasmine Rogers 3/10 3068 days 1%
Louis Nilsson 8/10 3072 days 2%
Tim 7/10 3072 days 2%
Jendrik 6/10 3072 days 2%
Katharina 7/10 3073 days 2%
Chris Valchero 9/10 3076 days 2%
Rulp Niet 8/10 3078 days 2%
Soeren Buchheister 9/10 3079 days 2%
Chas Bronson 8/10 3079 days 2%
Jakob Lovdahl 9/10 3081 days 2%
Alexandra Schmidt 10/10 3091 days 2%
Jade Williams 10/10 3092 days 2%
Sam Staines 10/10 3093 days 2%
Nickolas Jonkergouw 7/10 3097 days 2%
Kirsty Smith 10/10 3097 days 2%
Eva Hesse 10/10 3112 days 2%
celine gries 8/10 3112 days 2%
tinagermany111 8/10 3127 days 2%
Cassandra Geyer 8/10 3311 days 2%
Olivier Reculeau 8/10 3312 days 2%
Thomas Michel 5/10 3313 days 2%
Lisa Haedrich 5/10 3317 days 2%
Nadja Guiliani 8/10 3321 days 2%
Elbrich 8/10 3321 days 2%
Jamie Serieux 7/10 3324 days 2%
Adele Jacques 9/10 3325 days 2%
Daniel Weber 6/10 3327 days 2%
Emily Noyd 8/10 3329 days 2%
Aparna Gula 10/10 3330 days 2%
Sebastiaan 7/10 3332 days 2%
Andre 9/10 3333 days 2%
Benedikt Hang 7/10 3334 days 2%
Yannick 8/10 3334 days 2%
S Black 9/10 3335 days 2%
Paul Larauze 6/10 3338 days 2%
Florence 6/10 3339 days 2%
Sarah Kovacs 8/10 3340 days 2%
Frenziska Schmid 7/10 3342 days 2%
Maud Livolsi 7/10 3349 days 2%
Lewis Whittle 6/10 3351 days 2%
Lukas Seager 6/10 3351 days 2%
Andrea Tabaka 8/10 3358 days 2%
Tina Rust 8/10 3360 days 2%
Joel Papak 8/10 3362 days 2%
Clemence and Pedro 9/10 3363 days 2%
Doms Wahlelr 9/10 3365 days 2%
Josef Biller 8/10 3365 days 2%
Justine Hoffmann 8/10 3366 days 2%
Friederike East 7/10 3366 days 2%
Mark White 10/10 3367 days 2%
Briony 8/10 3370 days 2%
Gabriel Siibers 8/10 3370 days 2%
Henry Wichler 8/10 3371 days 2%
Kyle Johnson 9/10 3373 days 2%
Niels Wezenberg 7/10 3374 days 2%
John Hamilton 9/10 3374 days 2%
Brianna Burd 9/10 3374 days 2%
Jessica Ruhland 8/10 3375 days 2%
Stula Vladimir 10/10 3376 days 2%
Cosmo Hartuna 7/10 3378 days 2%
Roland Fischer 6/10 3378 days 2%
Ross Holmes 9/10 3379 days 2%
Tilman 9/10 3381 days 2%
Petru 7/10 3382 days 2%
Fero Saarinen 6/10 3383 days 2%
Lauren Thompson 8/10 3385 days 2%
Meilin 8/10 3388 days 2%
Jonas Hoerning 10/10 3392 days 2%
Vanesha Patel 6/10 3393 days 2%
Mauricio Daniele 9/10 3393 days 2%
Sara and Antoine 8/10 3395 days 2%
Clare Pickford 6/10 3395 days 2%
Daniel Hill 10/10 3396 days 2%
Moritz Braun 7/10 3412 days 2%
Grischa Rodust 8/10 3419 days 2%
Chalie Dotesek 9/10 3420 days 2%
Julien Lafeville 7/10 3424 days 2%
Julia Huesam 8/10 3424 days 2%
Alexandre 9/10 3428 days 2%
Kev Zarka 6/10 3429 days 2%
Markus Wabing 8/10 3432 days 2%
Gessica 6/10 3465 days 1%
Simon Quass 9/10 3469 days 2%
Barthelemy 7/10 3698 days 1%
Brita Topp 10/10 4041 days 1%
Laim Thompson 8/10 4041 days 1%
Adriana 10/10 4049 days 1%
Pavel Jarolimek 5/10 4049 days 0%
Leonie Moeller 6/10 4050 days 0%
Doreen Gendel 8/10 4051 days 1%
Carla Oyarzun 3/10 4054 days 0%
Paolo Cases 3/10 4054 days 0%
Wolfgang and Christine 8/10 4059 days 1%
Helen 8/10 4072 days 0%
Olivier Carval 9/10 4074 days 0%
Hirsch Svenja 9/10 4075 days 0%
Mahr Svenja 8/10 4075 days 0%
Anna Guzewiez 9/10 4091 days 0%
Pier Durand 8/10 4095 days 0%
Serena Poggioli 9/10 4095 days 0%
Wayne Schist 7/10 4095 days 0%
Margreth Lydie 5/10 4103 days 0%
Laura Pleumeekers 7/10 4117 days 0%
David Brooks 10/10 4120 days 0%
Adrien Godeloup 9/10 4129 days 0%
Bet Dreno 8/10 4130 days 0%
Joachim 1/10 4131 days 0%
Pioter Jurkowski 7/10 4131 days 0%
Thomas Roche 9/10 4133 days 0%
Brian 9/10 4192 days 0%
hendrik king 9/10 4315 days 0%
Kiki Wykstra 5/10 4425 days 1%
Galen Licht 4/10 4425 days 1%
Yu-Ti Chu 7/10 4428 days 1%
Ton Martens 7/10 4428 days 1%
Joshua Perry 8/10 4433 days 1%
Molly Ladd 8/10 4433 days 1%
Michael Nolan 9/10 4437 days 1%
Julian Roots 9/10 4437 days 1%
Florent Corino 9/10 4441 days 1%
Amiot Cyriane 7/10 4441 days 1%
Annika 7/10 4441 days 1%
Jonas Herrmann 7/10 4441 days 1%
Matthieu Daveou 8/10 4441 days 1%
Julien Panossian 6/10 4441 days 1%
Raoul Montestruer 5/10 4441 days 1%
Alessa Ndra 8/10 4447 days 1%
Bjorn Hedmark 5/10 4448 days 1%
Evyatar Tulipman 7/10 4450 days 1%
S Curry 10/10 4465 days 1%
Ingrid 9/10 4509 days 1%
Reinier Timmer 7/10 4509 days 1%
Moorman 8/10 4518 days 1%
Stefan Roth 9/10 4543 days 1%
David 9/10 4557 days 1%
kevindang 10/10 4710 days 1%
Ruben Kunze 4/10 4792 days 1%
Sebastian Hol 9/10 4798 days 1%
Dick Stewart 8/10 4807 days 1%
David Beaumont 9/10 4814 days 1%
Beyeler 10/10 4819 days 1%
Nikita Sue 9/10 4824 days 1%
Schweiger 10/10 4826 days 1%
Jan & Marian 10/10 4905 days 1%
Konny 9/10 4909 days 1%
Waldemar Schuler 8/10 4909 days 1%
jule 3/10 4923 days 0%
Jack Potman 8/10 5125 days 1%
Jon_and_Family 9/10 5137 days 1%
Walker 9/10 5140 days 1%
Andreas Blessing 10/10 5148 days 1%
Gema 7/10 5151 days 1%
Avry Fabrice 6/10 5156 days 1%
Diane Johnston 9/10 5161 days 1%
Javier Munoz 8/10 5161 days 1%
Ben Akin-Smith 8/10 5162 days 1%
K Wallis 9/10 5167 days 1%
khs 9/10 5168 days 1%
Emma Ducat 9/10 5168 days 1%
Mr and Mrs Lambert 8/10 5175 days 1%
Andrew Koster 7/10 5181 days 1%
Bakker 8/10 5181 days 1%
Kimberly St Louis 8/10 5182 days 1%
Roel Wesstra 8/10 5188 days 1%
Seifert 10/10 5188 days 1%
Derek Woodward 9/10 5190 days 1%
Fabi & Sabi 8/10 5191 days 1%
Rosey834 8/10 5258 days 1%
Pete & Chris 10/10 5458 days 1%
Tony Masters 9/10 5521 days 1%
Hershell 8/10 5525 days 1%
Mike Robinson 9/10 5526 days 1%
Brent S 2/10 5527 days 0%
Zara Leyden 9/10 5535 days 1%
Judith 7/10 5539 days 1%
anon 8/10 5540 days 1%
Pierre Pilon 8/10 5541 days 1%
Jenny Omb 1/10 5546 days 0%
Frei Urs 6/10 5547 days 1%
Bryan Keddie 9/10 5557 days 1%
Leanne Rogan 5/10 5557 days 1%
Joanne Clarke 8/10 5561 days 1%
Wolfgang G 9/10 5567 days 1%
Thomas Signes 7/10 5588 days 1%
menzel 10/10 5606 days 1%
graemeh1 9/10 5607 days 1%
klinger 10/10 5607 days 1%
gereldineb 8/10 5617 days 1%
jennyb 9/10 5621 days 1%
Frank de Voogd 8/10 5627 days 1%
Jean Paul Mesnage 9/10 5633 days 1%
Hansjoerg Ehrmann 5/10 5634 days 1%
Daniel Alonso 9/10 5635 days 1%
Nigel Petrie 9/10 5646 days 1%
Tracy & Peter Cassidy 8/10 5662 days 1%
miniappleses 8/10 5684 days 1%
Josie Boyle 7/10 5795 days 1%
JanneP 9/10 5865 days 1%
Mikey 9/10 5872 days 1%
SablotniD 7/10 5877 days 1%
WiebkeS 9/10 5883 days 1%
Tanya 5/10 5885 days 1%
Jan 6/10 5885 days 1%
Viola 8/10 5886 days 1%
RowanL 7/10 5887 days 1%
VickiEngland 8/10 5895 days 1%
TomC1 8/10 5900 days 1%
AndyK 9/10 5900 days 1%
TatiamT 9/10 5900 days 1%
GillianK 8/10 5902 days 1%
EelcoK 9/10 5902 days 1%
Michael 9/10 5906 days 1%
soccaplaya14 10/10 5907 days 1%
Eugene 7/10 5909 days 1%
John 6/10 5911 days 1%
Tony 8/10 5916 days 1%
Middleton 4/10 5917 days 1%
Elise 8/10 5918 days 1%
Marie 8/10 5918 days 1%
ThomasS1 10/10 5922 days 1%
RasmusB 4/10 5924 days 1%
Simon 8/10 5929 days 1%
Phil&Joe 10/10 5932 days 1%
Marcus 7/10 5932 days 1%
Andre 7/10 5933 days 1%
Iris 9/10 5935 days 1%
Carla 7/10 5935 days 1%
Sandra 8/10 5940 days 1%
Schaffluber 10/10 5941 days 1%
Hayley 5/10 5941 days 1%
Con 2/10 5986 days 0%
felix 7/10 5987 days 1%
melissa 10/10 5993 days 1%
John B 5/10 5995 days 1%
Gemma 7/10 6034 days 1%
Henry 7/10 6034 days 1%
Antonella 10/10 6042 days 1%
Michelle 8/10 6042 days 1%
Laura 7/10 6051 days 1%
Sarah 8/10 6065 days 1%
Katerina 7/10 6086 days 1%
Erin 3/10 6086 days 0%
Mike Knight 9/10 6107 days 1%
Bronagh Mcartan 8/10 6116 days 1%
Dave 8/10 6127 days 1%
fgregory 10/10 6130 days 1%
Rhea 6/10 6175 days 1%
Georgina Mulligan 8/10 6187 days 1%
Karen C 7/10 6199 days 1%
Edmund Hillstone 10/10 6217 days 1%
Toby 6/10 6239 days 1%
Jennifer Baulch 9/10 6243 days 1%
Susan 8/10 6247 days 1%
Hoetnagels 7/10 6250 days 1%
Alan Bellerby 8/10 6253 days 1%
Sanne Jonker 7/10 6254 days 1%
Renske Tehurne 8/10 6258 days 1%
Benjamin Krein 7/10 6258 days 1%
Anne and Derek 8/10 6259 days 1%
James Davies 7/10 6259 days 1%
Naomi Horton 8/10 6260 days 1%
Roger Repolusk 8/10 6264 days 1%
Tony Wicks 6/10 6264 days 1%
Nancy Dol 8/10 6264 days 1%
Kristine 10/10 6264 days 1%
Kathy Hawey 9/10 6266 days 1%
David Buckley 8/10 6267 days 1%
Lena1 6/10 6268 days 1%
John Woodrow 8/10 6268 days 1%
Carmen Dolny 10/10 6268 days 1%
Haemnerli 8/10 6272 days 1%
Carla 8/10 6279 days 1%
Jim Curley 8/10 6279 days 1%
paulonline 7/10 6285 days 1%
Bex 6/10 6295 days 1%
Jenny Hulsebosch 8/10 6295 days 1%
Melissa Steedman 8/10 6306 days 1%
Tim 7/10 6307 days 1%
Falk Seidel 7/10 6310 days 1%
Hans Olthof 8/10 6310 days 1%
Anu 9/10 6313 days 1%
Anneli 6/10 6315 days 1%
purplekat99 10/10 6323 days 1%
Connor 10/10 6336 days 1%
Ad 7/10 6336 days 1%
Ann Westmacott 5/10 6341 days 1%
Paul Cowie 8/10 6342 days 1%
Ewen Maclean 8/10 6342 days 1%
Sarah Wilton 5/10 6342 days 1%
Arend v Dyn 7/10 6344 days 1%
Linda 8/10 6348 days 1%
Fiona 7/10 6348 days 1%
Ann 7/10 6349 days 1%
ranker_584 9/10 6352 days 1%
Christine 7/10 6352 days 1%
Nina 9/10 6352 days 1%
Anthony 7/10 6357 days 1%
Tom Clements 7/10 6357 days 1%
ranker_46 8/10 6469 days 1%
Pat Brewster 8/10 6469 days 1%
FrankOosterwijk 6/10 6554 days 1%
Kim 8/10 6554 days 1%
Helen 7/10 6585 days 1%
Heather 9/10 6585 days 1%
Helene 9/10 6597 days 1%
John 7/10 6597 days 1%
Giancarlo 6/10 6597 days 1%
Annette 4/10 6621 days 1%
John 5/10 6621 days 1%
Duncan 9/10 6626 days 1%
Jen 4/10 6637 days 1%
Rolf 8/10 6645 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

-2.17% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 72 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 133 days. Adjustments are according to the following table.

Days Adjustment
… …
130 -2.13%
131 -2.14%
132 -2.16%
133 -2.17%
134 -2.19%
135 -2.21%
136 -2.22%
… …

Balancing Adjustment

7.53% 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

77%

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.