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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

71.27%

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 1/10 118 days 41%
Colin Barrow 9/10 179 days 100%
Pauline 6/10 332 days 83%
Megan 5/10 484 days 68%
Marjolaine Loitz 4/10 514 days 57%
Keli Knox 10/10 849 days 61%
Yar 1/10 1063 days 16%
Pinocity 6/10 1428 days 12%
Helen Russell 10/10 1609 days 8%
NewZealander 10/10 1883 days 5%
Tommy Pickett 9/10 2706 days 3%
Tom Bennett 8/10 2710 days 3%
Jeny Smolders 9/10 2712 days 3%
Gregg Wagstaff 7/10 2937 days 3%
Lianne Ijlst 8/10 2965 days 3%
Samantha and Neis 8/10 2966 days 3%
Brandon Cassidy 7/10 2982 days 2%
Vic Baughen 9/10 2984 days 3%
Anders Frank 7/10 2988 days 2%
Dina Schurer 8/10 2989 days 3%
Kim Youngsub 9/10 2990 days 3%
DEBBIE LAMBERT 10/10 2994 days 3%
Gary Williams 8/10 2994 days 3%
Kimberley Gardien 8/10 3001 days 3%
Antoine 9/10 3022 days 3%
Judit Van lanen 9/10 3027 days 3%
Bjorn Nielsen 8/10 3029 days 2%
Joel Virtanen 9/10 3031 days 3%
Corbin Hure 7/10 3031 days 2%
Ron 6/10 3034 days 2%
Thomas Simeon 8/10 3034 days 2%
Suzannah Hill 8/10 3035 days 2%
Kallan Mrozek 9/10 3036 days 3%
Kees Mol 9/10 3040 days 2%
Kristal Lavender 10/10 3040 days 3%
Bastian Bley 9/10 3041 days 2%
Jasmine Rogers 3/10 3042 days 1%
Louis Nilsson 8/10 3046 days 2%
Tim 7/10 3046 days 2%
Jendrik 6/10 3046 days 2%
Katharina 7/10 3047 days 2%
Chris Valchero 9/10 3050 days 2%
Rulp Niet 8/10 3052 days 2%
Soeren Buchheister 9/10 3053 days 2%
Chas Bronson 8/10 3053 days 2%
Jakob Lovdahl 9/10 3055 days 2%
Alexandra Schmidt 10/10 3065 days 2%
Jade Williams 10/10 3066 days 2%
Sam Staines 10/10 3067 days 2%
Nickolas Jonkergouw 7/10 3071 days 2%
Kirsty Smith 10/10 3071 days 2%
Eva Hesse 10/10 3086 days 2%
celine gries 8/10 3086 days 2%
tinagermany111 8/10 3101 days 2%
Cassandra Geyer 8/10 3285 days 2%
Olivier Reculeau 8/10 3286 days 2%
Thomas Michel 5/10 3287 days 1%
Lisa Haedrich 5/10 3291 days 1%
Nadja Guiliani 8/10 3295 days 2%
Elbrich 8/10 3295 days 2%
Jamie Serieux 7/10 3298 days 2%
Adele Jacques 9/10 3299 days 2%
Daniel Weber 6/10 3301 days 2%
Emily Noyd 8/10 3303 days 2%
Aparna Gula 10/10 3304 days 2%
Sebastiaan 7/10 3306 days 2%
Andre 9/10 3307 days 2%
Benedikt Hang 7/10 3308 days 2%
Yannick 8/10 3308 days 2%
S Black 9/10 3309 days 2%
Paul Larauze 6/10 3312 days 2%
Florence 6/10 3313 days 2%
Sarah Kovacs 8/10 3314 days 2%
Frenziska Schmid 7/10 3316 days 2%
Maud Livolsi 7/10 3323 days 2%
Lewis Whittle 6/10 3325 days 2%
Lukas Seager 6/10 3325 days 2%
Andrea Tabaka 8/10 3332 days 2%
Tina Rust 8/10 3334 days 2%
Joel Papak 8/10 3336 days 2%
Clemence and Pedro 9/10 3337 days 2%
Doms Wahlelr 9/10 3339 days 2%
Josef Biller 8/10 3339 days 2%
Justine Hoffmann 8/10 3340 days 2%
Friederike East 7/10 3340 days 2%
Mark White 10/10 3341 days 2%
Briony 8/10 3344 days 2%
Gabriel Siibers 8/10 3344 days 2%
Henry Wichler 8/10 3345 days 2%
Kyle Johnson 9/10 3347 days 2%
Niels Wezenberg 7/10 3348 days 2%
John Hamilton 9/10 3348 days 2%
Brianna Burd 9/10 3348 days 2%
Jessica Ruhland 8/10 3349 days 2%
Stula Vladimir 10/10 3350 days 2%
Cosmo Hartuna 7/10 3352 days 2%
Roland Fischer 6/10 3352 days 2%
Ross Holmes 9/10 3353 days 2%
Tilman 9/10 3355 days 2%
Petru 7/10 3356 days 2%
Fero Saarinen 6/10 3357 days 2%
Lauren Thompson 8/10 3359 days 2%
Meilin 8/10 3362 days 2%
Jonas Hoerning 10/10 3366 days 2%
Vanesha Patel 6/10 3367 days 2%
Mauricio Daniele 9/10 3367 days 2%
Sara and Antoine 8/10 3369 days 2%
Clare Pickford 6/10 3369 days 2%
Daniel Hill 10/10 3370 days 2%
Moritz Braun 7/10 3386 days 2%
Grischa Rodust 8/10 3393 days 2%
Chalie Dotesek 9/10 3394 days 2%
Julien Lafeville 7/10 3398 days 2%
Julia Huesam 8/10 3398 days 2%
Alexandre 9/10 3402 days 2%
Kev Zarka 6/10 3403 days 2%
Markus Wabing 8/10 3406 days 2%
Gessica 6/10 3439 days 1%
Simon Quass 9/10 3443 days 2%
Barthelemy 7/10 3672 days 1%
Brita Topp 10/10 4015 days 1%
Laim Thompson 8/10 4015 days 1%
Adriana 10/10 4023 days 1%
Pavel Jarolimek 5/10 4023 days 0%
Leonie Moeller 6/10 4024 days 0%
Doreen Gendel 8/10 4025 days 1%
Carla Oyarzun 3/10 4028 days 0%
Paolo Cases 3/10 4028 days 0%
Wolfgang and Christine 8/10 4033 days 1%
Helen 8/10 4046 days 0%
Olivier Carval 9/10 4048 days 0%
Hirsch Svenja 9/10 4049 days 0%
Mahr Svenja 8/10 4049 days 0%
Anna Guzewiez 9/10 4065 days 0%
Pier Durand 8/10 4069 days 0%
Serena Poggioli 9/10 4069 days 0%
Wayne Schist 7/10 4069 days 0%
Margreth Lydie 5/10 4077 days 0%
Laura Pleumeekers 7/10 4091 days 0%
David Brooks 10/10 4094 days 0%
Adrien Godeloup 9/10 4103 days 0%
Bet Dreno 8/10 4104 days 0%
Joachim 1/10 4105 days 0%
Pioter Jurkowski 7/10 4105 days 0%
Thomas Roche 9/10 4107 days 0%
Brian 9/10 4166 days 0%
hendrik king 9/10 4289 days 0%
Kiki Wykstra 5/10 4399 days 1%
Galen Licht 4/10 4399 days 0%
Yu-Ti Chu 7/10 4402 days 1%
Ton Martens 7/10 4402 days 1%
Joshua Perry 8/10 4407 days 1%
Molly Ladd 8/10 4407 days 1%
Michael Nolan 9/10 4411 days 1%
Julian Roots 9/10 4411 days 1%
Florent Corino 9/10 4415 days 1%
Amiot Cyriane 7/10 4415 days 1%
Annika 7/10 4415 days 1%
Jonas Herrmann 7/10 4415 days 1%
Matthieu Daveou 8/10 4415 days 1%
Julien Panossian 6/10 4415 days 1%
Raoul Montestruer 5/10 4415 days 1%
Alessa Ndra 8/10 4421 days 1%
Bjorn Hedmark 5/10 4422 days 1%
Evyatar Tulipman 7/10 4424 days 1%
S Curry 10/10 4439 days 1%
Ingrid 9/10 4483 days 1%
Reinier Timmer 7/10 4483 days 1%
Moorman 8/10 4492 days 1%
Stefan Roth 9/10 4517 days 1%
David 9/10 4531 days 1%
kevindang 10/10 4684 days 1%
Ruben Kunze 4/10 4766 days 0%
Sebastian Hol 9/10 4772 days 1%
Dick Stewart 8/10 4781 days 1%
David Beaumont 9/10 4788 days 1%
Beyeler 10/10 4793 days 1%
Nikita Sue 9/10 4798 days 1%
Schweiger 10/10 4800 days 1%
Jan & Marian 10/10 4879 days 1%
Konny 9/10 4883 days 1%
Waldemar Schuler 8/10 4883 days 1%
jule 3/10 4897 days 0%
Jack Potman 8/10 5099 days 1%
Jon_and_Family 9/10 5111 days 1%
Walker 9/10 5114 days 1%
Andreas Blessing 10/10 5122 days 1%
Gema 7/10 5125 days 1%
Avry Fabrice 6/10 5130 days 1%
Diane Johnston 9/10 5135 days 1%
Javier Munoz 8/10 5135 days 1%
Ben Akin-Smith 8/10 5136 days 1%
K Wallis 9/10 5141 days 1%
khs 9/10 5142 days 1%
Emma Ducat 9/10 5142 days 1%
Mr and Mrs Lambert 8/10 5149 days 1%
Andrew Koster 7/10 5155 days 1%
Bakker 8/10 5155 days 1%
Kimberly St Louis 8/10 5156 days 1%
Roel Wesstra 8/10 5162 days 1%
Seifert 10/10 5162 days 1%
Derek Woodward 9/10 5164 days 1%
Fabi & Sabi 8/10 5165 days 1%
Rosey834 8/10 5232 days 1%
Pete & Chris 10/10 5432 days 1%
Tony Masters 9/10 5495 days 1%
Hershell 8/10 5499 days 1%
Mike Robinson 9/10 5500 days 1%
Brent S 2/10 5501 days 0%
Zara Leyden 9/10 5509 days 1%
Judith 7/10 5513 days 1%
anon 8/10 5514 days 1%
Pierre Pilon 8/10 5515 days 1%
Jenny Omb 1/10 5520 days 0%
Frei Urs 6/10 5521 days 1%
Bryan Keddie 9/10 5531 days 1%
Leanne Rogan 5/10 5531 days 1%
Joanne Clarke 8/10 5535 days 1%
Wolfgang G 9/10 5541 days 1%
Thomas Signes 7/10 5562 days 1%
menzel 10/10 5580 days 1%
graemeh1 9/10 5581 days 1%
klinger 10/10 5581 days 1%
gereldineb 8/10 5591 days 1%
jennyb 9/10 5595 days 1%
Frank de Voogd 8/10 5601 days 1%
Jean Paul Mesnage 9/10 5607 days 1%
Hansjoerg Ehrmann 5/10 5608 days 1%
Daniel Alonso 9/10 5609 days 1%
Nigel Petrie 9/10 5620 days 1%
Tracy & Peter Cassidy 8/10 5636 days 1%
miniappleses 8/10 5658 days 1%
Josie Boyle 7/10 5769 days 1%
JanneP 9/10 5839 days 1%
Mikey 9/10 5846 days 1%
SablotniD 7/10 5851 days 1%
WiebkeS 9/10 5857 days 1%
Tanya 5/10 5858 days 1%
Jan 6/10 5859 days 1%
Viola 8/10 5860 days 1%
RowanL 7/10 5861 days 1%
VickiEngland 8/10 5869 days 1%
TomC1 8/10 5874 days 1%
AndyK 9/10 5874 days 1%
TatiamT 9/10 5874 days 1%
GillianK 8/10 5876 days 1%
EelcoK 9/10 5876 days 1%
Michael 9/10 5880 days 1%
soccaplaya14 10/10 5881 days 1%
Eugene 7/10 5883 days 1%
John 6/10 5885 days 1%
Tony 8/10 5889 days 1%
Middleton 4/10 5890 days 0%
Elise 8/10 5892 days 1%
Marie 8/10 5892 days 1%
ThomasS1 10/10 5896 days 1%
RasmusB 4/10 5898 days 0%
Simon 8/10 5903 days 1%
Phil&Joe 10/10 5906 days 1%
Marcus 7/10 5906 days 1%
Andre 7/10 5907 days 1%
Iris 9/10 5909 days 1%
Carla 7/10 5909 days 1%
Sandra 8/10 5913 days 1%
Schaffluber 10/10 5914 days 1%
Hayley 5/10 5915 days 1%
Con 2/10 5959 days 0%
felix 7/10 5960 days 1%
melissa 10/10 5967 days 1%
John B 5/10 5969 days 1%
Gemma 7/10 6008 days 1%
Henry 7/10 6008 days 1%
Antonella 10/10 6016 days 1%
Michelle 8/10 6016 days 1%
Laura 7/10 6025 days 1%
Sarah 8/10 6039 days 1%
Katerina 7/10 6060 days 1%
Erin 3/10 6060 days 0%
Mike Knight 9/10 6081 days 1%
Bronagh Mcartan 8/10 6090 days 1%
Dave 8/10 6100 days 1%
fgregory 10/10 6104 days 1%
Rhea 6/10 6149 days 1%
Georgina Mulligan 8/10 6161 days 1%
Karen C 7/10 6173 days 1%
Edmund Hillstone 10/10 6191 days 1%
Toby 6/10 6213 days 1%
Jennifer Baulch 9/10 6217 days 1%
Susan 8/10 6221 days 1%
Hoetnagels 7/10 6224 days 1%
Alan Bellerby 8/10 6227 days 1%
Sanne Jonker 7/10 6228 days 1%
Renske Tehurne 8/10 6232 days 1%
Benjamin Krein 7/10 6232 days 1%
Anne and Derek 8/10 6233 days 1%
James Davies 7/10 6233 days 1%
Naomi Horton 8/10 6234 days 1%
Roger Repolusk 8/10 6238 days 1%
Tony Wicks 6/10 6238 days 1%
Nancy Dol 8/10 6238 days 1%
Kristine 10/10 6238 days 1%
Kathy Hawey 9/10 6240 days 1%
David Buckley 8/10 6241 days 1%
Lena1 6/10 6242 days 1%
John Woodrow 8/10 6242 days 1%
Carmen Dolny 10/10 6242 days 1%
Haemnerli 8/10 6246 days 1%
Carla 8/10 6253 days 1%
Jim Curley 8/10 6253 days 1%
paulonline 7/10 6259 days 1%
Bex 6/10 6268 days 1%
Jenny Hulsebosch 8/10 6269 days 1%
Melissa Steedman 8/10 6280 days 1%
Tim 7/10 6281 days 1%
Falk Seidel 7/10 6284 days 1%
Hans Olthof 8/10 6284 days 1%
Anu 9/10 6287 days 1%
Anneli 6/10 6289 days 1%
purplekat99 10/10 6297 days 1%
Connor 10/10 6310 days 1%
Ad 7/10 6310 days 1%
Ann Westmacott 5/10 6315 days 1%
Paul Cowie 8/10 6316 days 1%
Ewen Maclean 8/10 6316 days 1%
Sarah Wilton 5/10 6316 days 1%
Arend v Dyn 7/10 6318 days 1%
Linda 8/10 6322 days 1%
Fiona 7/10 6322 days 1%
Ann 7/10 6323 days 1%
ranker_584 9/10 6326 days 1%
Christine 7/10 6326 days 1%
Nina 9/10 6326 days 1%
Anthony 7/10 6331 days 1%
Tom Clements 7/10 6331 days 1%
ranker_46 8/10 6443 days 1%
Pat Brewster 8/10 6443 days 1%
FrankOosterwijk 6/10 6528 days 1%
Kim 8/10 6528 days 1%
Helen 7/10 6559 days 1%
Heather 9/10 6559 days 1%
Helene 9/10 6571 days 1%
John 7/10 6571 days 1%
Giancarlo 6/10 6571 days 1%
Annette 4/10 6595 days 0%
John 5/10 6595 days 1%
Duncan 9/10 6600 days 1%
Jen 4/10 6611 days 0%
Rolf 8/10 6619 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

-2.03% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 59 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 107 days. Adjustments are according to the following table.

Days Adjustment
… …
104 -1.97%
105 -1.99%
106 -2.01%
107 -2.03%
108 -2.05%
109 -2.06%
110 -2.08%
… …

Balancing Adjustment

7.42% 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.