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 358 reviews. There are 348 valid reviews that are included when calculating the ranking score and 10 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

71.33%

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 17 days 41%
Colin Barrow 9/10 78 days 100%
Pauline 6/10 231 days 85%
Megan 5/10 383 days 71%
Marjolaine Loitz 4/10 413 days 60%
Keli Knox 10/10 748 days 69%
Yar 1/10 962 days 19%
Pinocity 6/10 1327 days 17%
Helen Russell 10/10 1508 days 11%
NewZealander 10/10 1782 days 5%
Tommy Pickett 9/10 2605 days 3%
Tom Bennett 8/10 2609 days 3%
Jeny Smolders 9/10 2611 days 3%
Gregg Wagstaff 7/10 2836 days 3%
Lianne Ijlst 8/10 2864 days 3%
Samantha and Neis 8/10 2865 days 3%
Brandon Cassidy 7/10 2881 days 3%
Vic Baughen 9/10 2883 days 3%
Anders Frank 7/10 2887 days 3%
Dina Schurer 8/10 2888 days 3%
Kim Youngsub 9/10 2889 days 3%
DEBBIE LAMBERT 10/10 2893 days 3%
Gary Williams 8/10 2893 days 3%
Kimberley Gardien 8/10 2900 days 3%
Antoine 9/10 2921 days 3%
Judit Van lanen 9/10 2926 days 3%
Bjorn Nielsen 8/10 2928 days 3%
Joel Virtanen 9/10 2930 days 3%
Corbin Hure 7/10 2930 days 3%
Ron 6/10 2933 days 2%
Thomas Simeon 8/10 2933 days 3%
Suzannah Hill 8/10 2934 days 3%
Kallan Mrozek 9/10 2935 days 3%
Kees Mol 9/10 2939 days 3%
Kristal Lavender 10/10 2939 days 3%
Bastian Bley 9/10 2940 days 3%
Jasmine Rogers 3/10 2941 days 1%
Louis Nilsson 8/10 2945 days 3%
Tim 7/10 2945 days 3%
Jendrik 6/10 2945 days 2%
Katharina 7/10 2946 days 3%
Chris Valchero 9/10 2949 days 3%
Rulp Niet 8/10 2951 days 3%
Soeren Buchheister 9/10 2952 days 3%
Chas Bronson 8/10 2952 days 3%
Jakob Lovdahl 9/10 2954 days 3%
Alexandra Schmidt 10/10 2964 days 3%
Jade Williams 10/10 2965 days 3%
Sam Staines 10/10 2966 days 3%
Nickolas Jonkergouw 7/10 2970 days 3%
Kirsty Smith 10/10 2970 days 3%
Eva Hesse 10/10 2985 days 3%
celine gries 8/10 2985 days 3%
tinagermany111 8/10 3000 days 3%
Cassandra Geyer 8/10 3184 days 2%
Olivier Reculeau 8/10 3185 days 2%
Thomas Michel 5/10 3186 days 2%
Lisa Haedrich 5/10 3190 days 2%
Nadja Guiliani 8/10 3194 days 2%
Elbrich 8/10 3194 days 2%
Jamie Serieux 7/10 3197 days 2%
Adele Jacques 9/10 3198 days 2%
Daniel Weber 6/10 3200 days 2%
Emily Noyd 8/10 3202 days 2%
Aparna Gula 10/10 3203 days 2%
Sebastiaan 7/10 3205 days 2%
Andre 9/10 3206 days 2%
Benedikt Hang 7/10 3207 days 2%
Yannick 8/10 3207 days 2%
S Black 9/10 3208 days 2%
Paul Larauze 6/10 3211 days 2%
Florence 6/10 3212 days 2%
Sarah Kovacs 8/10 3213 days 2%
Frenziska Schmid 7/10 3215 days 2%
Maud Livolsi 7/10 3222 days 2%
Lewis Whittle 6/10 3224 days 2%
Lukas Seager 6/10 3224 days 2%
Andrea Tabaka 8/10 3231 days 2%
Tina Rust 8/10 3233 days 2%
Joel Papak 8/10 3235 days 2%
Clemence and Pedro 9/10 3236 days 2%
Doms Wahlelr 9/10 3238 days 2%
Josef Biller 8/10 3238 days 2%
Justine Hoffmann 8/10 3239 days 2%
Friederike East 7/10 3239 days 2%
Mark White 10/10 3240 days 2%
Briony 8/10 3243 days 2%
Gabriel Siibers 8/10 3243 days 2%
Henry Wichler 8/10 3244 days 2%
Kyle Johnson 9/10 3246 days 2%
Niels Wezenberg 7/10 3247 days 2%
John Hamilton 9/10 3247 days 2%
Brianna Burd 9/10 3247 days 2%
Jessica Ruhland 8/10 3248 days 2%
Stula Vladimir 10/10 3249 days 2%
Cosmo Hartuna 7/10 3251 days 2%
Roland Fischer 6/10 3251 days 2%
Ross Holmes 9/10 3252 days 2%
Tilman 9/10 3254 days 2%
Petru 7/10 3255 days 2%
Fero Saarinen 6/10 3256 days 2%
Lauren Thompson 8/10 3258 days 2%
Meilin 8/10 3261 days 2%
Jonas Hoerning 10/10 3265 days 2%
Vanesha Patel 6/10 3266 days 2%
Mauricio Daniele 9/10 3266 days 2%
Sara and Antoine 8/10 3268 days 2%
Clare Pickford 6/10 3268 days 2%
Daniel Hill 10/10 3269 days 2%
Moritz Braun 7/10 3285 days 2%
Grischa Rodust 8/10 3292 days 2%
Chalie Dotesek 9/10 3293 days 2%
Julien Lafeville 7/10 3297 days 2%
Julia Huesam 8/10 3297 days 2%
Alexandre 9/10 3301 days 2%
Kev Zarka 6/10 3302 days 2%
Markus Wabing 8/10 3305 days 2%
Gessica 6/10 3338 days 2%
Simon Quass 9/10 3342 days 2%
Barthelemy 7/10 3571 days 1%
Brita Topp 10/10 3914 days 1%
Laim Thompson 8/10 3914 days 1%
Adriana 10/10 3922 days 1%
Pavel Jarolimek 5/10 3922 days 1%
Leonie Moeller 6/10 3923 days 1%
Doreen Gendel 8/10 3924 days 1%
Carla Oyarzun 3/10 3927 days 0%
Paolo Cases 3/10 3927 days 0%
Wolfgang and Christine 8/10 3932 days 1%
Helen 8/10 3945 days 1%
Olivier Carval 9/10 3947 days 1%
Hirsch Svenja 9/10 3948 days 1%
Mahr Svenja 8/10 3948 days 1%
Anna Guzewiez 9/10 3964 days 1%
Pier Durand 8/10 3968 days 1%
Serena Poggioli 9/10 3968 days 1%
Wayne Schist 7/10 3968 days 1%
Margreth Lydie 5/10 3976 days 1%
Laura Pleumeekers 7/10 3990 days 1%
David Brooks 10/10 3993 days 1%
Adrien Godeloup 9/10 4002 days 1%
Bet Dreno 8/10 4003 days 1%
Joachim 1/10 4004 days 0%
Pioter Jurkowski 7/10 4004 days 1%
Thomas Roche 9/10 4006 days 1%
Brian 9/10 4065 days 1%
hendrik king 9/10 4188 days 0%
Kiki Wykstra 5/10 4298 days 0%
Galen Licht 4/10 4298 days 0%
Yu-Ti Chu 7/10 4301 days 0%
Ton Martens 7/10 4301 days 0%
Joshua Perry 8/10 4306 days 0%
Molly Ladd 8/10 4306 days 0%
Michael Nolan 9/10 4310 days 0%
Julian Roots 9/10 4310 days 0%
Florent Corino 9/10 4314 days 0%
Amiot Cyriane 7/10 4314 days 0%
Annika 7/10 4314 days 0%
Jonas Herrmann 7/10 4314 days 0%
Matthieu Daveou 8/10 4314 days 0%
Julien Panossian 6/10 4314 days 0%
Raoul Montestruer 5/10 4314 days 0%
Alessa Ndra 8/10 4320 days 0%
Bjorn Hedmark 5/10 4321 days 0%
Evyatar Tulipman 7/10 4323 days 0%
S Curry 10/10 4338 days 0%
Ingrid 9/10 4382 days 1%
Reinier Timmer 7/10 4382 days 1%
Moorman 8/10 4391 days 1%
Stefan Roth 9/10 4416 days 1%
David 9/10 4430 days 1%
kevindang 10/10 4583 days 1%
Ruben Kunze 4/10 4665 days 1%
Sebastian Hol 9/10 4671 days 1%
Dick Stewart 8/10 4680 days 1%
David Beaumont 9/10 4687 days 1%
Beyeler 10/10 4692 days 1%
Nikita Sue 9/10 4697 days 1%
Schweiger 10/10 4699 days 1%
Jan & Marian 10/10 4778 days 1%
Konny 9/10 4782 days 1%
Waldemar Schuler 8/10 4782 days 1%
jule 3/10 4796 days 0%
Jack Potman 8/10 4998 days 1%
Jon_and_Family 9/10 5010 days 1%
Walker 9/10 5013 days 1%
Andreas Blessing 10/10 5021 days 1%
Gema 7/10 5024 days 1%
Avry Fabrice 6/10 5029 days 1%
Diane Johnston 9/10 5034 days 1%
Javier Munoz 8/10 5034 days 1%
Ben Akin-Smith 8/10 5035 days 1%
K Wallis 9/10 5040 days 1%
khs 9/10 5041 days 1%
Emma Ducat 9/10 5041 days 1%
Mr and Mrs Lambert 8/10 5048 days 1%
Andrew Koster 7/10 5054 days 1%
Bakker 8/10 5054 days 1%
Kimberly St Louis 8/10 5055 days 1%
Roel Wesstra 8/10 5061 days 1%
Seifert 10/10 5061 days 1%
Derek Woodward 9/10 5063 days 1%
Fabi & Sabi 8/10 5064 days 1%
Rosey834 8/10 5131 days 1%
Pete & Chris 10/10 5331 days 1%
Tony Masters 9/10 5394 days 1%
Hershell 8/10 5398 days 1%
Mike Robinson 9/10 5399 days 1%
Brent S 2/10 5400 days 0%
Zara Leyden 9/10 5408 days 1%
Judith 7/10 5412 days 1%
anon 8/10 5413 days 1%
Pierre Pilon 8/10 5414 days 1%
Jenny Omb 1/10 5419 days 0%
Frei Urs 6/10 5420 days 1%
Bryan Keddie 9/10 5430 days 1%
Leanne Rogan 5/10 5430 days 1%
Joanne Clarke 8/10 5434 days 1%
Wolfgang G 9/10 5440 days 1%
Thomas Signes 7/10 5461 days 1%
menzel 10/10 5479 days 1%
graemeh1 9/10 5480 days 1%
klinger 10/10 5480 days 1%
gereldineb 8/10 5490 days 1%
jennyb 9/10 5494 days 1%
Frank de Voogd 8/10 5500 days 1%
Jean Paul Mesnage 9/10 5506 days 1%
Hansjoerg Ehrmann 5/10 5507 days 1%
Daniel Alonso 9/10 5508 days 1%
Nigel Petrie 9/10 5519 days 1%
Tracy & Peter Cassidy 8/10 5535 days 1%
miniappleses 8/10 5557 days 1%
Josie Boyle 7/10 5668 days 1%
JanneP 9/10 5738 days 1%
Mikey 9/10 5745 days 1%
SablotniD 7/10 5750 days 1%
WiebkeS 9/10 5756 days 1%
Tanya 5/10 5757 days 1%
Jan 6/10 5758 days 1%
Viola 8/10 5759 days 1%
RowanL 7/10 5760 days 1%
VickiEngland 8/10 5768 days 1%
TomC1 8/10 5773 days 1%
AndyK 9/10 5773 days 1%
TatiamT 9/10 5773 days 1%
GillianK 8/10 5775 days 1%
EelcoK 9/10 5775 days 1%
Michael 9/10 5779 days 1%
soccaplaya14 10/10 5780 days 1%
Eugene 7/10 5782 days 1%
John 6/10 5784 days 1%
Tony 8/10 5788 days 1%
Middleton 4/10 5789 days 1%
Elise 8/10 5791 days 1%
Marie 8/10 5791 days 1%
ThomasS1 10/10 5795 days 1%
RasmusB 4/10 5797 days 1%
Simon 8/10 5802 days 1%
Phil&Joe 10/10 5805 days 1%
Marcus 7/10 5805 days 1%
Andre 7/10 5806 days 1%
Iris 9/10 5808 days 1%
Carla 7/10 5808 days 1%
Sandra 8/10 5812 days 1%
Schaffluber 10/10 5813 days 1%
Hayley 5/10 5814 days 1%
Con 2/10 5858 days 0%
felix 7/10 5859 days 1%
melissa 10/10 5866 days 1%
John B 5/10 5868 days 1%
Gemma 7/10 5907 days 1%
Henry 7/10 5907 days 1%
Antonella 10/10 5915 days 1%
Michelle 8/10 5915 days 1%
Laura 7/10 5924 days 1%
Sarah 8/10 5938 days 1%
Katerina 7/10 5959 days 1%
Erin 3/10 5959 days 0%
Mike Knight 9/10 5980 days 1%
Bronagh Mcartan 8/10 5989 days 1%
Dave 8/10 5999 days 1%
fgregory 10/10 6003 days 1%
Rhea 6/10 6048 days 1%
Georgina Mulligan 8/10 6060 days 1%
Karen C 7/10 6072 days 1%
Edmund Hillstone 10/10 6090 days 1%
Toby 6/10 6112 days 1%
Jennifer Baulch 9/10 6116 days 1%
Susan 8/10 6120 days 1%
Hoetnagels 7/10 6123 days 1%
Alan Bellerby 8/10 6126 days 1%
Sanne Jonker 7/10 6127 days 1%
Renske Tehurne 8/10 6131 days 1%
Benjamin Krein 7/10 6131 days 1%
Anne and Derek 8/10 6132 days 1%
James Davies 7/10 6132 days 1%
Naomi Horton 8/10 6133 days 1%
Roger Repolusk 8/10 6137 days 1%
Tony Wicks 6/10 6137 days 1%
Nancy Dol 8/10 6137 days 1%
Kristine 10/10 6137 days 1%
Kathy Hawey 9/10 6139 days 1%
David Buckley 8/10 6140 days 1%
Lena1 6/10 6141 days 1%
John Woodrow 8/10 6141 days 1%
Carmen Dolny 10/10 6141 days 1%
Haemnerli 8/10 6145 days 1%
Carla 8/10 6152 days 1%
Jim Curley 8/10 6152 days 1%
paulonline 7/10 6158 days 1%
Bex 6/10 6167 days 1%
Jenny Hulsebosch 8/10 6168 days 1%
Melissa Steedman 8/10 6179 days 1%
Tim 7/10 6180 days 1%
Falk Seidel 7/10 6183 days 1%
Hans Olthof 8/10 6183 days 1%
Anu 9/10 6186 days 1%
Anneli 6/10 6188 days 1%
purplekat99 10/10 6196 days 1%
Connor 10/10 6209 days 1%
Ad 7/10 6209 days 1%
Ann Westmacott 5/10 6214 days 1%
Paul Cowie 8/10 6215 days 1%
Ewen Maclean 8/10 6215 days 1%
Sarah Wilton 5/10 6215 days 1%
Arend v Dyn 7/10 6217 days 1%
Linda 8/10 6221 days 1%
Fiona 7/10 6221 days 1%
Ann 7/10 6222 days 1%
ranker_584 9/10 6225 days 1%
Christine 7/10 6225 days 1%
Nina 9/10 6225 days 1%
Anthony 7/10 6230 days 1%
Tom Clements 7/10 6230 days 1%
ranker_46 8/10 6342 days 1%
Pat Brewster 8/10 6342 days 1%
FrankOosterwijk 6/10 6427 days 1%
Kim 8/10 6427 days 1%
Helen 7/10 6458 days 1%
Heather 9/10 6458 days 1%
Helene 9/10 6470 days 1%
John 7/10 6470 days 1%
Giancarlo 6/10 6470 days 1%
Annette 4/10 6494 days 1%
John 5/10 6494 days 1%
Duncan 9/10 6499 days 1%
Jen 4/10 6510 days 1%
Rolf 8/10 6518 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

-0.12% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 42 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 6 days. Adjustments are according to the following table.

Days Adjustment
3 -0.06%
4 -0.08%
5 -0.10%
6 -0.12%
7 -0.14%
8 -0.16%
9 -0.18%

Balancing Adjustment

6.34% 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

78%

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.