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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.

CC
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 1/10 125 days 41%
Colin Barrow 9/10 186 days 100%
Pauline 6/10 339 days 83%
Megan 5/10 491 days 68%
Marjolaine Loitz 4/10 521 days 57%
Keli Knox 10/10 856 days 60%
Yar 1/10 1070 days 16%
Pinocity 6/10 1435 days 12%
Helen Russell 10/10 1616 days 8%
NewZealander 10/10 1890 days 5%
Tommy Pickett 9/10 2713 days 3%
Tom Bennett 8/10 2717 days 3%
Jeny Smolders 9/10 2719 days 3%
Gregg Wagstaff 7/10 2944 days 3%
Lianne Ijlst 8/10 2972 days 3%
Samantha and Neis 8/10 2973 days 3%
Brandon Cassidy 7/10 2989 days 2%
Vic Baughen 9/10 2991 days 3%
Anders Frank 7/10 2995 days 2%
Dina Schurer 8/10 2996 days 3%
Kim Youngsub 9/10 2997 days 3%
DEBBIE LAMBERT 10/10 3001 days 3%
Gary Williams 8/10 3001 days 3%
Kimberley Gardien 8/10 3008 days 3%
Antoine 9/10 3029 days 3%
Judit Van lanen 9/10 3034 days 3%
Bjorn Nielsen 8/10 3036 days 2%
Joel Virtanen 9/10 3038 days 3%
Corbin Hure 7/10 3038 days 2%
Ron 6/10 3041 days 2%
Thomas Simeon 8/10 3041 days 2%
Suzannah Hill 8/10 3042 days 2%
Kallan Mrozek 9/10 3043 days 3%
Kees Mol 9/10 3047 days 2%
Kristal Lavender 10/10 3047 days 3%
Bastian Bley 9/10 3048 days 2%
Jasmine Rogers 3/10 3049 days 1%
Louis Nilsson 8/10 3053 days 2%
Tim 7/10 3053 days 2%
Jendrik 6/10 3053 days 2%
Katharina 7/10 3054 days 2%
Chris Valchero 9/10 3057 days 2%
Rulp Niet 8/10 3059 days 2%
Soeren Buchheister 9/10 3060 days 2%
Chas Bronson 8/10 3060 days 2%
Jakob Lovdahl 9/10 3062 days 2%
Alexandra Schmidt 10/10 3072 days 2%
Jade Williams 10/10 3073 days 2%
Sam Staines 10/10 3074 days 2%
Nickolas Jonkergouw 7/10 3078 days 2%
Kirsty Smith 10/10 3078 days 2%
Eva Hesse 10/10 3093 days 2%
celine gries 8/10 3093 days 2%
tinagermany111 8/10 3108 days 2%
Cassandra Geyer 8/10 3292 days 2%
Olivier Reculeau 8/10 3293 days 2%
Thomas Michel 5/10 3294 days 2%
Lisa Haedrich 5/10 3298 days 1%
Nadja Guiliani 8/10 3302 days 2%
Elbrich 8/10 3302 days 2%
Jamie Serieux 7/10 3305 days 2%
Adele Jacques 9/10 3306 days 2%
Daniel Weber 6/10 3308 days 2%
Emily Noyd 8/10 3310 days 2%
Aparna Gula 10/10 3311 days 2%
Sebastiaan 7/10 3313 days 2%
Andre 9/10 3314 days 2%
Benedikt Hang 7/10 3315 days 2%
Yannick 8/10 3315 days 2%
S Black 9/10 3316 days 2%
Paul Larauze 6/10 3319 days 2%
Florence 6/10 3320 days 2%
Sarah Kovacs 8/10 3321 days 2%
Frenziska Schmid 7/10 3323 days 2%
Maud Livolsi 7/10 3330 days 2%
Lewis Whittle 6/10 3332 days 2%
Lukas Seager 6/10 3332 days 2%
Andrea Tabaka 8/10 3339 days 2%
Tina Rust 8/10 3341 days 2%
Joel Papak 8/10 3343 days 2%
Clemence and Pedro 9/10 3344 days 2%
Doms Wahlelr 9/10 3346 days 2%
Josef Biller 8/10 3346 days 2%
Justine Hoffmann 8/10 3347 days 2%
Friederike East 7/10 3347 days 2%
Mark White 10/10 3348 days 2%
Briony 8/10 3351 days 2%
Gabriel Siibers 8/10 3351 days 2%
Henry Wichler 8/10 3352 days 2%
Kyle Johnson 9/10 3354 days 2%
Niels Wezenberg 7/10 3355 days 2%
John Hamilton 9/10 3355 days 2%
Brianna Burd 9/10 3355 days 2%
Jessica Ruhland 8/10 3356 days 2%
Stula Vladimir 10/10 3357 days 2%
Cosmo Hartuna 7/10 3359 days 2%
Roland Fischer 6/10 3359 days 2%
Ross Holmes 9/10 3360 days 2%
Tilman 9/10 3362 days 2%
Petru 7/10 3363 days 2%
Fero Saarinen 6/10 3364 days 2%
Lauren Thompson 8/10 3366 days 2%
Meilin 8/10 3369 days 2%
Jonas Hoerning 10/10 3373 days 2%
Vanesha Patel 6/10 3374 days 2%
Mauricio Daniele 9/10 3374 days 2%
Sara and Antoine 8/10 3376 days 2%
Clare Pickford 6/10 3376 days 2%
Daniel Hill 10/10 3377 days 2%
Moritz Braun 7/10 3393 days 2%
Grischa Rodust 8/10 3400 days 2%
Chalie Dotesek 9/10 3401 days 2%
Julien Lafeville 7/10 3405 days 2%
Julia Huesam 8/10 3405 days 2%
Alexandre 9/10 3409 days 2%
Kev Zarka 6/10 3410 days 2%
Markus Wabing 8/10 3413 days 2%
Gessica 6/10 3446 days 1%
Simon Quass 9/10 3450 days 2%
Barthelemy 7/10 3679 days 1%
Brita Topp 10/10 4022 days 1%
Laim Thompson 8/10 4022 days 1%
Adriana 10/10 4030 days 1%
Pavel Jarolimek 5/10 4030 days 0%
Leonie Moeller 6/10 4031 days 0%
Doreen Gendel 8/10 4032 days 1%
Carla Oyarzun 3/10 4035 days 0%
Paolo Cases 3/10 4035 days 0%
Wolfgang and Christine 8/10 4040 days 1%
Helen 8/10 4053 days 0%
Olivier Carval 9/10 4055 days 0%
Hirsch Svenja 9/10 4056 days 0%
Mahr Svenja 8/10 4056 days 0%
Anna Guzewiez 9/10 4072 days 0%
Pier Durand 8/10 4076 days 0%
Serena Poggioli 9/10 4076 days 0%
Wayne Schist 7/10 4076 days 0%
Margreth Lydie 5/10 4084 days 0%
Laura Pleumeekers 7/10 4098 days 0%
David Brooks 10/10 4101 days 0%
Adrien Godeloup 9/10 4110 days 0%
Bet Dreno 8/10 4111 days 0%
Joachim 1/10 4112 days 0%
Pioter Jurkowski 7/10 4112 days 0%
Thomas Roche 9/10 4114 days 0%
Brian 9/10 4173 days 0%
hendrik king 9/10 4296 days 0%
Kiki Wykstra 5/10 4406 days 1%
Galen Licht 4/10 4406 days 1%
Yu-Ti Chu 7/10 4409 days 1%
Ton Martens 7/10 4409 days 1%
Joshua Perry 8/10 4414 days 1%
Molly Ladd 8/10 4414 days 1%
Michael Nolan 9/10 4418 days 1%
Julian Roots 9/10 4418 days 1%
Florent Corino 9/10 4422 days 1%
Amiot Cyriane 7/10 4422 days 1%
Annika 7/10 4422 days 1%
Jonas Herrmann 7/10 4422 days 1%
Matthieu Daveou 8/10 4422 days 1%
Julien Panossian 6/10 4422 days 1%
Raoul Montestruer 5/10 4422 days 1%
Alessa Ndra 8/10 4428 days 1%
Bjorn Hedmark 5/10 4429 days 1%
Evyatar Tulipman 7/10 4431 days 1%
S Curry 10/10 4446 days 1%
Ingrid 9/10 4490 days 1%
Reinier Timmer 7/10 4490 days 1%
Moorman 8/10 4499 days 1%
Stefan Roth 9/10 4524 days 1%
David 9/10 4538 days 1%
kevindang 10/10 4691 days 1%
Ruben Kunze 4/10 4773 days 1%
Sebastian Hol 9/10 4779 days 1%
Dick Stewart 8/10 4788 days 1%
David Beaumont 9/10 4795 days 1%
Beyeler 10/10 4800 days 1%
Nikita Sue 9/10 4805 days 1%
Schweiger 10/10 4807 days 1%
Jan & Marian 10/10 4886 days 1%
Konny 9/10 4890 days 1%
Waldemar Schuler 8/10 4890 days 1%
jule 3/10 4904 days 0%
Jack Potman 8/10 5106 days 1%
Jon_and_Family 9/10 5118 days 1%
Walker 9/10 5121 days 1%
Andreas Blessing 10/10 5129 days 1%
Gema 7/10 5132 days 1%
Avry Fabrice 6/10 5137 days 1%
Diane Johnston 9/10 5142 days 1%
Javier Munoz 8/10 5142 days 1%
Ben Akin-Smith 8/10 5143 days 1%
K Wallis 9/10 5148 days 1%
khs 9/10 5149 days 1%
Emma Ducat 9/10 5149 days 1%
Mr and Mrs Lambert 8/10 5156 days 1%
Andrew Koster 7/10 5162 days 1%
Bakker 8/10 5162 days 1%
Kimberly St Louis 8/10 5163 days 1%
Roel Wesstra 8/10 5169 days 1%
Seifert 10/10 5169 days 1%
Derek Woodward 9/10 5171 days 1%
Fabi & Sabi 8/10 5172 days 1%
Rosey834 8/10 5239 days 1%
Pete & Chris 10/10 5439 days 1%
Tony Masters 9/10 5502 days 1%
Hershell 8/10 5506 days 1%
Mike Robinson 9/10 5507 days 1%
Brent S 2/10 5508 days 0%
Zara Leyden 9/10 5516 days 1%
Judith 7/10 5520 days 1%
anon 8/10 5521 days 1%
Pierre Pilon 8/10 5522 days 1%
Jenny Omb 1/10 5527 days 0%
Frei Urs 6/10 5528 days 1%
Bryan Keddie 9/10 5538 days 1%
Leanne Rogan 5/10 5538 days 1%
Joanne Clarke 8/10 5542 days 1%
Wolfgang G 9/10 5548 days 1%
Thomas Signes 7/10 5569 days 1%
menzel 10/10 5587 days 1%
graemeh1 9/10 5588 days 1%
klinger 10/10 5588 days 1%
gereldineb 8/10 5598 days 1%
jennyb 9/10 5602 days 1%
Frank de Voogd 8/10 5608 days 1%
Jean Paul Mesnage 9/10 5614 days 1%
Hansjoerg Ehrmann 5/10 5615 days 1%
Daniel Alonso 9/10 5616 days 1%
Nigel Petrie 9/10 5627 days 1%
Tracy & Peter Cassidy 8/10 5643 days 1%
miniappleses 8/10 5665 days 1%
Josie Boyle 7/10 5776 days 1%
JanneP 9/10 5846 days 1%
Mikey 9/10 5853 days 1%
SablotniD 7/10 5858 days 1%
WiebkeS 9/10 5864 days 1%
Tanya 5/10 5865 days 1%
Jan 6/10 5866 days 1%
Viola 8/10 5867 days 1%
RowanL 7/10 5868 days 1%
VickiEngland 8/10 5876 days 1%
TomC1 8/10 5881 days 1%
AndyK 9/10 5881 days 1%
TatiamT 9/10 5881 days 1%
GillianK 8/10 5883 days 1%
EelcoK 9/10 5883 days 1%
Michael 9/10 5887 days 1%
soccaplaya14 10/10 5888 days 1%
Eugene 7/10 5889 days 1%
John 6/10 5891 days 1%
Tony 8/10 5896 days 1%
Middleton 4/10 5897 days 1%
Elise 8/10 5899 days 1%
Marie 8/10 5899 days 1%
ThomasS1 10/10 5903 days 1%
RasmusB 4/10 5905 days 1%
Simon 8/10 5910 days 1%
Phil&Joe 10/10 5912 days 1%
Marcus 7/10 5913 days 1%
Andre 7/10 5914 days 1%
Iris 9/10 5916 days 1%
Carla 7/10 5916 days 1%
Sandra 8/10 5920 days 1%
Schaffluber 10/10 5921 days 1%
Hayley 5/10 5922 days 1%
Con 2/10 5966 days 0%
felix 7/10 5967 days 1%
melissa 10/10 5974 days 1%
John B 5/10 5976 days 1%
Gemma 7/10 6015 days 1%
Henry 7/10 6015 days 1%
Antonella 10/10 6023 days 1%
Michelle 8/10 6023 days 1%
Laura 7/10 6031 days 1%
Sarah 8/10 6046 days 1%
Katerina 7/10 6066 days 1%
Erin 3/10 6066 days 0%
Mike Knight 9/10 6087 days 1%
Bronagh Mcartan 8/10 6096 days 1%
Dave 8/10 6107 days 1%
fgregory 10/10 6111 days 1%
Rhea 6/10 6156 days 1%
Georgina Mulligan 8/10 6168 days 1%
Karen C 7/10 6180 days 1%
Edmund Hillstone 10/10 6197 days 1%
Toby 6/10 6220 days 1%
Jennifer Baulch 9/10 6224 days 1%
Susan 8/10 6228 days 1%
Hoetnagels 7/10 6231 days 1%
Alan Bellerby 8/10 6234 days 1%
Sanne Jonker 7/10 6235 days 1%
Renske Tehurne 8/10 6239 days 1%
Benjamin Krein 7/10 6239 days 1%
Anne and Derek 8/10 6240 days 1%
James Davies 7/10 6240 days 1%
Naomi Horton 8/10 6241 days 1%
Roger Repolusk 8/10 6245 days 1%
Tony Wicks 6/10 6245 days 1%
Nancy Dol 8/10 6245 days 1%
Kristine 10/10 6245 days 1%
Kathy Hawey 9/10 6247 days 1%
David Buckley 8/10 6248 days 1%
Lena1 6/10 6248 days 1%
John Woodrow 8/10 6249 days 1%
Carmen Dolny 10/10 6249 days 1%
Haemnerli 8/10 6253 days 1%
Carla 8/10 6260 days 1%
Jim Curley 8/10 6260 days 1%
paulonline 7/10 6266 days 1%
Bex 6/10 6275 days 1%
Jenny Hulsebosch 8/10 6276 days 1%
Melissa Steedman 8/10 6287 days 1%
Tim 7/10 6288 days 1%
Falk Seidel 7/10 6291 days 1%
Hans Olthof 8/10 6291 days 1%
Anu 9/10 6294 days 1%
Anneli 6/10 6296 days 1%
purplekat99 10/10 6304 days 1%
Connor 10/10 6317 days 1%
Ad 7/10 6317 days 1%
Ann Westmacott 5/10 6322 days 1%
Paul Cowie 8/10 6323 days 1%
Ewen Maclean 8/10 6323 days 1%
Sarah Wilton 5/10 6323 days 1%
Arend v Dyn 7/10 6325 days 1%
Linda 8/10 6329 days 1%
Fiona 7/10 6329 days 1%
Ann 7/10 6330 days 1%
ranker_584 9/10 6333 days 1%
Christine 7/10 6333 days 1%
Nina 9/10 6333 days 1%
Anthony 7/10 6338 days 1%
Tom Clements 7/10 6338 days 1%
ranker_46 8/10 6450 days 1%
Pat Brewster 8/10 6450 days 1%
FrankOosterwijk 6/10 6535 days 1%
Kim 8/10 6535 days 1%
Helen 7/10 6566 days 1%
Heather 9/10 6566 days 1%
Helene 9/10 6578 days 1%
John 7/10 6578 days 1%
Giancarlo 6/10 6578 days 1%
Annette 4/10 6602 days 1%
John 5/10 6602 days 1%
Duncan 9/10 6607 days 1%
Jen 4/10 6618 days 1%
Rolf 8/10 6626 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

-2.09% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 61 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 114 days. Adjustments are according to the following table.

Days Adjustment
… …
111 -2.03%
112 -2.05%
113 -2.07%
114 -2.09%
115 -2.11%
116 -2.12%
117 -2.14%
… …

Balancing Adjustment

7.46% 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.