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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.

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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

71.26%

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 1/10 127 days 41%
Colin Barrow 9/10 188 days 100%
Pauline 6/10 341 days 83%
Megan 5/10 493 days 68%
Marjolaine Loitz 4/10 523 days 57%
Keli Knox 10/10 858 days 60%
Yar 1/10 1072 days 15%
Pinocity 6/10 1437 days 12%
Helen Russell 10/10 1618 days 8%
NewZealander 10/10 1892 days 5%
Tommy Pickett 9/10 2715 days 3%
Tom Bennett 8/10 2719 days 3%
Jeny Smolders 9/10 2721 days 3%
Gregg Wagstaff 7/10 2946 days 3%
Lianne Ijlst 8/10 2974 days 3%
Samantha and Neis 8/10 2975 days 3%
Brandon Cassidy 7/10 2991 days 2%
Vic Baughen 9/10 2993 days 3%
Anders Frank 7/10 2997 days 2%
Dina Schurer 8/10 2998 days 3%
Kim Youngsub 9/10 2999 days 3%
DEBBIE LAMBERT 10/10 3003 days 3%
Gary Williams 8/10 3003 days 3%
Kimberley Gardien 8/10 3010 days 3%
Antoine 9/10 3031 days 3%
Judit Van lanen 9/10 3036 days 3%
Bjorn Nielsen 8/10 3038 days 2%
Joel Virtanen 9/10 3040 days 3%
Corbin Hure 7/10 3040 days 2%
Ron 6/10 3043 days 2%
Thomas Simeon 8/10 3043 days 2%
Suzannah Hill 8/10 3044 days 2%
Kallan Mrozek 9/10 3045 days 3%
Kees Mol 9/10 3049 days 2%
Kristal Lavender 10/10 3049 days 3%
Bastian Bley 9/10 3050 days 2%
Jasmine Rogers 3/10 3051 days 1%
Louis Nilsson 8/10 3055 days 2%
Tim 7/10 3055 days 2%
Jendrik 6/10 3055 days 2%
Katharina 7/10 3056 days 2%
Chris Valchero 9/10 3059 days 2%
Rulp Niet 8/10 3061 days 2%
Soeren Buchheister 9/10 3062 days 2%
Chas Bronson 8/10 3062 days 2%
Jakob Lovdahl 9/10 3064 days 2%
Alexandra Schmidt 10/10 3074 days 2%
Jade Williams 10/10 3075 days 2%
Sam Staines 10/10 3076 days 2%
Nickolas Jonkergouw 7/10 3080 days 2%
Kirsty Smith 10/10 3080 days 2%
Eva Hesse 10/10 3095 days 2%
celine gries 8/10 3095 days 2%
tinagermany111 8/10 3109 days 2%
Cassandra Geyer 8/10 3294 days 2%
Olivier Reculeau 8/10 3295 days 2%
Thomas Michel 5/10 3296 days 2%
Lisa Haedrich 5/10 3300 days 1%
Nadja Guiliani 8/10 3304 days 2%
Elbrich 8/10 3304 days 2%
Jamie Serieux 7/10 3307 days 2%
Adele Jacques 9/10 3308 days 2%
Daniel Weber 6/10 3310 days 2%
Emily Noyd 8/10 3312 days 2%
Aparna Gula 10/10 3313 days 2%
Sebastiaan 7/10 3315 days 2%
Andre 9/10 3316 days 2%
Benedikt Hang 7/10 3317 days 2%
Yannick 8/10 3317 days 2%
S Black 9/10 3318 days 2%
Paul Larauze 6/10 3321 days 2%
Florence 6/10 3322 days 2%
Sarah Kovacs 8/10 3323 days 2%
Frenziska Schmid 7/10 3325 days 2%
Maud Livolsi 7/10 3332 days 2%
Lewis Whittle 6/10 3334 days 2%
Lukas Seager 6/10 3334 days 2%
Andrea Tabaka 8/10 3341 days 2%
Tina Rust 8/10 3343 days 2%
Joel Papak 8/10 3345 days 2%
Clemence and Pedro 9/10 3346 days 2%
Doms Wahlelr 9/10 3348 days 2%
Josef Biller 8/10 3348 days 2%
Justine Hoffmann 8/10 3349 days 2%
Friederike East 7/10 3349 days 2%
Mark White 10/10 3350 days 2%
Briony 8/10 3353 days 2%
Gabriel Siibers 8/10 3353 days 2%
Henry Wichler 8/10 3354 days 2%
Kyle Johnson 9/10 3356 days 2%
Niels Wezenberg 7/10 3357 days 2%
John Hamilton 9/10 3357 days 2%
Brianna Burd 9/10 3357 days 2%
Jessica Ruhland 8/10 3358 days 2%
Stula Vladimir 10/10 3359 days 2%
Cosmo Hartuna 7/10 3361 days 2%
Roland Fischer 6/10 3361 days 2%
Ross Holmes 9/10 3362 days 2%
Tilman 9/10 3364 days 2%
Petru 7/10 3365 days 2%
Fero Saarinen 6/10 3366 days 2%
Lauren Thompson 8/10 3368 days 2%
Meilin 8/10 3371 days 2%
Jonas Hoerning 10/10 3375 days 2%
Vanesha Patel 6/10 3376 days 2%
Mauricio Daniele 9/10 3376 days 2%
Sara and Antoine 8/10 3378 days 2%
Clare Pickford 6/10 3378 days 2%
Daniel Hill 10/10 3379 days 2%
Moritz Braun 7/10 3395 days 2%
Grischa Rodust 8/10 3402 days 2%
Chalie Dotesek 9/10 3403 days 2%
Julien Lafeville 7/10 3407 days 2%
Julia Huesam 8/10 3407 days 2%
Alexandre 9/10 3411 days 2%
Kev Zarka 6/10 3412 days 2%
Markus Wabing 8/10 3415 days 2%
Gessica 6/10 3448 days 1%
Simon Quass 9/10 3452 days 2%
Barthelemy 7/10 3681 days 1%
Brita Topp 10/10 4024 days 1%
Laim Thompson 8/10 4024 days 1%
Adriana 10/10 4032 days 1%
Pavel Jarolimek 5/10 4032 days 0%
Leonie Moeller 6/10 4033 days 0%
Doreen Gendel 8/10 4034 days 1%
Carla Oyarzun 3/10 4037 days 0%
Paolo Cases 3/10 4037 days 0%
Wolfgang and Christine 8/10 4042 days 1%
Helen 8/10 4055 days 0%
Olivier Carval 9/10 4057 days 0%
Hirsch Svenja 9/10 4058 days 0%
Mahr Svenja 8/10 4058 days 0%
Anna Guzewiez 9/10 4074 days 0%
Pier Durand 8/10 4078 days 0%
Serena Poggioli 9/10 4078 days 0%
Wayne Schist 7/10 4078 days 0%
Margreth Lydie 5/10 4086 days 0%
Laura Pleumeekers 7/10 4100 days 0%
David Brooks 10/10 4103 days 0%
Adrien Godeloup 9/10 4112 days 0%
Bet Dreno 8/10 4113 days 0%
Joachim 1/10 4114 days 0%
Pioter Jurkowski 7/10 4114 days 0%
Thomas Roche 9/10 4116 days 0%
Brian 9/10 4175 days 0%
hendrik king 9/10 4298 days 0%
Kiki Wykstra 5/10 4408 days 1%
Galen Licht 4/10 4408 days 1%
Yu-Ti Chu 7/10 4411 days 1%
Ton Martens 7/10 4411 days 1%
Joshua Perry 8/10 4416 days 1%
Molly Ladd 8/10 4416 days 1%
Michael Nolan 9/10 4420 days 1%
Julian Roots 9/10 4420 days 1%
Florent Corino 9/10 4424 days 1%
Amiot Cyriane 7/10 4424 days 1%
Annika 7/10 4424 days 1%
Jonas Herrmann 7/10 4424 days 1%
Matthieu Daveou 8/10 4424 days 1%
Julien Panossian 6/10 4424 days 1%
Raoul Montestruer 5/10 4424 days 1%
Alessa Ndra 8/10 4430 days 1%
Bjorn Hedmark 5/10 4431 days 1%
Evyatar Tulipman 7/10 4433 days 1%
S Curry 10/10 4448 days 1%
Ingrid 9/10 4492 days 1%
Reinier Timmer 7/10 4492 days 1%
Moorman 8/10 4501 days 1%
Stefan Roth 9/10 4526 days 1%
David 9/10 4540 days 1%
kevindang 10/10 4693 days 1%
Ruben Kunze 4/10 4775 days 1%
Sebastian Hol 9/10 4781 days 1%
Dick Stewart 8/10 4790 days 1%
David Beaumont 9/10 4797 days 1%
Beyeler 10/10 4802 days 1%
Nikita Sue 9/10 4807 days 1%
Schweiger 10/10 4809 days 1%
Jan & Marian 10/10 4888 days 1%
Konny 9/10 4892 days 1%
Waldemar Schuler 8/10 4892 days 1%
jule 3/10 4906 days 0%
Jack Potman 8/10 5108 days 1%
Jon_and_Family 9/10 5120 days 1%
Walker 9/10 5123 days 1%
Andreas Blessing 10/10 5131 days 1%
Gema 7/10 5134 days 1%
Avry Fabrice 6/10 5139 days 1%
Diane Johnston 9/10 5144 days 1%
Javier Munoz 8/10 5144 days 1%
Ben Akin-Smith 8/10 5145 days 1%
K Wallis 9/10 5150 days 1%
khs 9/10 5151 days 1%
Emma Ducat 9/10 5151 days 1%
Mr and Mrs Lambert 8/10 5158 days 1%
Andrew Koster 7/10 5164 days 1%
Bakker 8/10 5164 days 1%
Kimberly St Louis 8/10 5165 days 1%
Roel Wesstra 8/10 5171 days 1%
Seifert 10/10 5171 days 1%
Derek Woodward 9/10 5173 days 1%
Fabi & Sabi 8/10 5174 days 1%
Rosey834 8/10 5241 days 1%
Pete & Chris 10/10 5441 days 1%
Tony Masters 9/10 5504 days 1%
Hershell 8/10 5508 days 1%
Mike Robinson 9/10 5509 days 1%
Brent S 2/10 5510 days 0%
Zara Leyden 9/10 5518 days 1%
Judith 7/10 5522 days 1%
anon 8/10 5523 days 1%
Pierre Pilon 8/10 5524 days 1%
Jenny Omb 1/10 5529 days 0%
Frei Urs 6/10 5530 days 1%
Bryan Keddie 9/10 5540 days 1%
Leanne Rogan 5/10 5540 days 1%
Joanne Clarke 8/10 5544 days 1%
Wolfgang G 9/10 5550 days 1%
Thomas Signes 7/10 5571 days 1%
menzel 10/10 5589 days 1%
graemeh1 9/10 5590 days 1%
klinger 10/10 5590 days 1%
gereldineb 8/10 5600 days 1%
jennyb 9/10 5604 days 1%
Frank de Voogd 8/10 5610 days 1%
Jean Paul Mesnage 9/10 5616 days 1%
Hansjoerg Ehrmann 5/10 5617 days 1%
Daniel Alonso 9/10 5618 days 1%
Nigel Petrie 9/10 5629 days 1%
Tracy & Peter Cassidy 8/10 5645 days 1%
miniappleses 8/10 5667 days 1%
Josie Boyle 7/10 5778 days 1%
JanneP 9/10 5848 days 1%
Mikey 9/10 5855 days 1%
SablotniD 7/10 5859 days 1%
WiebkeS 9/10 5866 days 1%
Tanya 5/10 5867 days 1%
Jan 6/10 5867 days 1%
Viola 8/10 5869 days 1%
RowanL 7/10 5870 days 1%
VickiEngland 8/10 5878 days 1%
TomC1 8/10 5883 days 1%
AndyK 9/10 5883 days 1%
TatiamT 9/10 5883 days 1%
GillianK 8/10 5885 days 1%
EelcoK 9/10 5885 days 1%
Michael 9/10 5889 days 1%
soccaplaya14 10/10 5890 days 1%
Eugene 7/10 5891 days 1%
John 6/10 5893 days 1%
Tony 8/10 5898 days 1%
Middleton 4/10 5899 days 1%
Elise 8/10 5900 days 1%
Marie 8/10 5900 days 1%
ThomasS1 10/10 5905 days 1%
RasmusB 4/10 5907 days 1%
Simon 8/10 5912 days 1%
Phil&Joe 10/10 5914 days 1%
Marcus 7/10 5914 days 1%
Andre 7/10 5916 days 1%
Iris 9/10 5918 days 1%
Carla 7/10 5918 days 1%
Sandra 8/10 5922 days 1%
Schaffluber 10/10 5923 days 1%
Hayley 5/10 5924 days 1%
Con 2/10 5968 days 0%
felix 7/10 5969 days 1%
melissa 10/10 5975 days 1%
John B 5/10 5978 days 1%
Gemma 7/10 6017 days 1%
Henry 7/10 6017 days 1%
Antonella 10/10 6024 days 1%
Michelle 8/10 6024 days 1%
Laura 7/10 6033 days 1%
Sarah 8/10 6047 days 1%
Katerina 7/10 6068 days 1%
Erin 3/10 6068 days 0%
Mike Knight 9/10 6089 days 1%
Bronagh Mcartan 8/10 6098 days 1%
Dave 8/10 6109 days 1%
fgregory 10/10 6112 days 1%
Rhea 6/10 6158 days 1%
Georgina Mulligan 8/10 6170 days 1%
Karen C 7/10 6182 days 1%
Edmund Hillstone 10/10 6199 days 1%
Toby 6/10 6222 days 1%
Jennifer Baulch 9/10 6226 days 1%
Susan 8/10 6230 days 1%
Hoetnagels 7/10 6233 days 1%
Alan Bellerby 8/10 6236 days 1%
Sanne Jonker 7/10 6237 days 1%
Renske Tehurne 8/10 6241 days 1%
Benjamin Krein 7/10 6241 days 1%
Anne and Derek 8/10 6242 days 1%
James Davies 7/10 6242 days 1%
Naomi Horton 8/10 6243 days 1%
Roger Repolusk 8/10 6247 days 1%
Tony Wicks 6/10 6247 days 1%
Nancy Dol 8/10 6247 days 1%
Kristine 10/10 6247 days 1%
Kathy Hawey 9/10 6249 days 1%
David Buckley 8/10 6250 days 1%
Lena1 6/10 6250 days 1%
John Woodrow 8/10 6251 days 1%
Carmen Dolny 10/10 6251 days 1%
Haemnerli 8/10 6255 days 1%
Carla 8/10 6262 days 1%
Jim Curley 8/10 6262 days 1%
paulonline 7/10 6268 days 1%
Bex 6/10 6277 days 1%
Jenny Hulsebosch 8/10 6278 days 1%
Melissa Steedman 8/10 6289 days 1%
Tim 7/10 6290 days 1%
Falk Seidel 7/10 6293 days 1%
Hans Olthof 8/10 6293 days 1%
Anu 9/10 6296 days 1%
Anneli 6/10 6298 days 1%
purplekat99 10/10 6306 days 1%
Connor 10/10 6319 days 1%
Ad 7/10 6319 days 1%
Ann Westmacott 5/10 6324 days 1%
Paul Cowie 8/10 6325 days 1%
Ewen Maclean 8/10 6325 days 1%
Sarah Wilton 5/10 6325 days 1%
Arend v Dyn 7/10 6327 days 1%
Linda 8/10 6331 days 1%
Fiona 7/10 6331 days 1%
Ann 7/10 6332 days 1%
ranker_584 9/10 6335 days 1%
Christine 7/10 6335 days 1%
Nina 9/10 6335 days 1%
Anthony 7/10 6340 days 1%
Tom Clements 7/10 6340 days 1%
ranker_46 8/10 6452 days 1%
Pat Brewster 8/10 6452 days 1%
FrankOosterwijk 6/10 6537 days 1%
Kim 8/10 6537 days 1%
Helen 7/10 6568 days 1%
Heather 9/10 6568 days 1%
Helene 9/10 6580 days 1%
John 7/10 6580 days 1%
Giancarlo 6/10 6580 days 1%
Annette 4/10 6604 days 1%
John 5/10 6604 days 1%
Duncan 9/10 6609 days 1%
Jen 4/10 6620 days 1%
Rolf 8/10 6628 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

-2.08% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 62 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 115 days. Adjustments are according to the following table.

Days Adjustment
… …
112 -2.03%
113 -2.05%
114 -2.07%
115 -2.08%
116 -2.10%
117 -2.12%
118 -2.14%
… …

Balancing Adjustment

7.47% 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.