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.

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

71.29%

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 49 days 41%
Colin Barrow 9/10 110 days 100%
Pauline 6/10 263 days 84%
Megan 5/10 415 days 70%
Marjolaine Loitz 4/10 445 days 59%
Keli Knox 10/10 780 days 66%
Yar 1/10 994 days 18%
Pinocity 6/10 1359 days 15%
Helen Russell 10/10 1540 days 10%
NewZealander 10/10 1814 days 5%
Tommy Pickett 9/10 2637 days 3%
Tom Bennett 8/10 2641 days 3%
Jeny Smolders 9/10 2643 days 3%
Gregg Wagstaff 7/10 2868 days 3%
Lianne Ijlst 8/10 2896 days 3%
Samantha and Neis 8/10 2897 days 3%
Brandon Cassidy 7/10 2913 days 3%
Vic Baughen 9/10 2915 days 3%
Anders Frank 7/10 2919 days 3%
Dina Schurer 8/10 2920 days 3%
Kim Youngsub 9/10 2921 days 3%
DEBBIE LAMBERT 10/10 2925 days 3%
Gary Williams 8/10 2925 days 3%
Kimberley Gardien 8/10 2932 days 3%
Antoine 9/10 2953 days 3%
Judit Van lanen 9/10 2958 days 3%
Bjorn Nielsen 8/10 2960 days 3%
Joel Virtanen 9/10 2962 days 3%
Corbin Hure 7/10 2962 days 3%
Ron 6/10 2965 days 2%
Thomas Simeon 8/10 2965 days 3%
Suzannah Hill 8/10 2966 days 3%
Kallan Mrozek 9/10 2967 days 3%
Kees Mol 9/10 2971 days 3%
Kristal Lavender 10/10 2971 days 3%
Bastian Bley 9/10 2972 days 3%
Jasmine Rogers 3/10 2973 days 2%
Louis Nilsson 8/10 2977 days 3%
Tim 7/10 2977 days 3%
Jendrik 6/10 2977 days 2%
Katharina 7/10 2978 days 3%
Chris Valchero 9/10 2981 days 3%
Rulp Niet 8/10 2983 days 3%
Soeren Buchheister 9/10 2984 days 3%
Chas Bronson 8/10 2984 days 3%
Jakob Lovdahl 9/10 2986 days 3%
Alexandra Schmidt 10/10 2996 days 3%
Jade Williams 10/10 2997 days 3%
Sam Staines 10/10 2998 days 3%
Nickolas Jonkergouw 7/10 3002 days 3%
Kirsty Smith 10/10 3002 days 3%
Eva Hesse 10/10 3017 days 3%
celine gries 8/10 3017 days 3%
tinagermany111 8/10 3031 days 3%
Cassandra Geyer 8/10 3216 days 2%
Olivier Reculeau 8/10 3217 days 2%
Thomas Michel 5/10 3218 days 2%
Lisa Haedrich 5/10 3222 days 2%
Nadja Guiliani 8/10 3226 days 2%
Elbrich 8/10 3226 days 2%
Jamie Serieux 7/10 3229 days 2%
Adele Jacques 9/10 3230 days 2%
Daniel Weber 6/10 3232 days 2%
Emily Noyd 8/10 3234 days 2%
Aparna Gula 10/10 3235 days 2%
Sebastiaan 7/10 3237 days 2%
Andre 9/10 3238 days 2%
Benedikt Hang 7/10 3239 days 2%
Yannick 8/10 3239 days 2%
S Black 9/10 3240 days 2%
Paul Larauze 6/10 3243 days 2%
Florence 6/10 3244 days 2%
Sarah Kovacs 8/10 3245 days 2%
Frenziska Schmid 7/10 3247 days 2%
Maud Livolsi 7/10 3254 days 2%
Lewis Whittle 6/10 3256 days 2%
Lukas Seager 6/10 3256 days 2%
Andrea Tabaka 8/10 3263 days 2%
Tina Rust 8/10 3265 days 2%
Joel Papak 8/10 3267 days 2%
Clemence and Pedro 9/10 3268 days 2%
Doms Wahlelr 9/10 3270 days 2%
Josef Biller 8/10 3270 days 2%
Justine Hoffmann 8/10 3271 days 2%
Friederike East 7/10 3271 days 2%
Mark White 10/10 3272 days 2%
Briony 8/10 3275 days 2%
Gabriel Siibers 8/10 3275 days 2%
Henry Wichler 8/10 3276 days 2%
Kyle Johnson 9/10 3278 days 2%
Niels Wezenberg 7/10 3279 days 2%
John Hamilton 9/10 3279 days 2%
Brianna Burd 9/10 3279 days 2%
Jessica Ruhland 8/10 3280 days 2%
Stula Vladimir 10/10 3281 days 2%
Cosmo Hartuna 7/10 3283 days 2%
Roland Fischer 6/10 3283 days 2%
Ross Holmes 9/10 3284 days 2%
Tilman 9/10 3286 days 2%
Petru 7/10 3287 days 2%
Fero Saarinen 6/10 3288 days 2%
Lauren Thompson 8/10 3290 days 2%
Meilin 8/10 3293 days 2%
Jonas Hoerning 10/10 3297 days 2%
Vanesha Patel 6/10 3298 days 2%
Mauricio Daniele 9/10 3298 days 2%
Sara and Antoine 8/10 3300 days 2%
Clare Pickford 6/10 3300 days 2%
Daniel Hill 10/10 3301 days 2%
Moritz Braun 7/10 3317 days 2%
Grischa Rodust 8/10 3324 days 2%
Chalie Dotesek 9/10 3325 days 2%
Julien Lafeville 7/10 3329 days 2%
Julia Huesam 8/10 3329 days 2%
Alexandre 9/10 3333 days 2%
Kev Zarka 6/10 3334 days 2%
Markus Wabing 8/10 3337 days 2%
Gessica 6/10 3370 days 2%
Simon Quass 9/10 3374 days 2%
Barthelemy 7/10 3603 days 1%
Brita Topp 10/10 3946 days 1%
Laim Thompson 8/10 3946 days 1%
Adriana 10/10 3954 days 1%
Pavel Jarolimek 5/10 3954 days 1%
Leonie Moeller 6/10 3955 days 1%
Doreen Gendel 8/10 3956 days 1%
Carla Oyarzun 3/10 3959 days 0%
Paolo Cases 3/10 3959 days 0%
Wolfgang and Christine 8/10 3964 days 1%
Helen 8/10 3977 days 1%
Olivier Carval 9/10 3979 days 1%
Hirsch Svenja 9/10 3980 days 1%
Mahr Svenja 8/10 3980 days 1%
Anna Guzewiez 9/10 3996 days 1%
Pier Durand 8/10 4000 days 1%
Serena Poggioli 9/10 4000 days 1%
Wayne Schist 7/10 4000 days 1%
Margreth Lydie 5/10 4008 days 1%
Laura Pleumeekers 7/10 4022 days 1%
David Brooks 10/10 4025 days 1%
Adrien Godeloup 9/10 4034 days 1%
Bet Dreno 8/10 4035 days 1%
Joachim 1/10 4036 days 0%
Pioter Jurkowski 7/10 4036 days 1%
Thomas Roche 9/10 4038 days 1%
Brian 9/10 4097 days 1%
hendrik king 9/10 4220 days 0%
Kiki Wykstra 5/10 4330 days 0%
Galen Licht 4/10 4330 days 0%
Yu-Ti Chu 7/10 4333 days 0%
Ton Martens 7/10 4333 days 0%
Joshua Perry 8/10 4338 days 0%
Molly Ladd 8/10 4338 days 0%
Michael Nolan 9/10 4342 days 0%
Julian Roots 9/10 4342 days 0%
Florent Corino 9/10 4346 days 0%
Amiot Cyriane 7/10 4346 days 0%
Annika 7/10 4346 days 0%
Jonas Herrmann 7/10 4346 days 0%
Matthieu Daveou 8/10 4346 days 0%
Julien Panossian 6/10 4346 days 0%
Raoul Montestruer 5/10 4346 days 0%
Alessa Ndra 8/10 4352 days 0%
Bjorn Hedmark 5/10 4353 days 0%
Evyatar Tulipman 7/10 4355 days 0%
S Curry 10/10 4370 days 0%
Ingrid 9/10 4414 days 1%
Reinier Timmer 7/10 4414 days 1%
Moorman 8/10 4423 days 1%
Stefan Roth 9/10 4448 days 1%
David 9/10 4462 days 1%
kevindang 10/10 4615 days 1%
Ruben Kunze 4/10 4697 days 1%
Sebastian Hol 9/10 4703 days 1%
Dick Stewart 8/10 4712 days 1%
David Beaumont 9/10 4719 days 1%
Beyeler 10/10 4724 days 1%
Nikita Sue 9/10 4729 days 1%
Schweiger 10/10 4731 days 1%
Jan & Marian 10/10 4810 days 1%
Konny 9/10 4814 days 1%
Waldemar Schuler 8/10 4814 days 1%
jule 3/10 4828 days 1%
Jack Potman 8/10 5030 days 1%
Jon_and_Family 9/10 5042 days 1%
Walker 9/10 5045 days 1%
Andreas Blessing 10/10 5053 days 1%
Gema 7/10 5056 days 1%
Avry Fabrice 6/10 5061 days 1%
Diane Johnston 9/10 5066 days 1%
Javier Munoz 8/10 5066 days 1%
Ben Akin-Smith 8/10 5067 days 1%
K Wallis 9/10 5072 days 1%
khs 9/10 5073 days 1%
Emma Ducat 9/10 5073 days 1%
Mr and Mrs Lambert 8/10 5080 days 1%
Andrew Koster 7/10 5086 days 1%
Bakker 8/10 5086 days 1%
Kimberly St Louis 8/10 5087 days 1%
Roel Wesstra 8/10 5093 days 1%
Seifert 10/10 5093 days 1%
Derek Woodward 9/10 5095 days 1%
Fabi & Sabi 8/10 5096 days 1%
Rosey834 8/10 5163 days 1%
Pete & Chris 10/10 5363 days 1%
Tony Masters 9/10 5426 days 1%
Hershell 8/10 5430 days 1%
Mike Robinson 9/10 5431 days 1%
Brent S 2/10 5432 days 0%
Zara Leyden 9/10 5440 days 1%
Judith 7/10 5444 days 1%
anon 8/10 5445 days 1%
Pierre Pilon 8/10 5446 days 1%
Jenny Omb 1/10 5451 days 0%
Frei Urs 6/10 5452 days 1%
Bryan Keddie 9/10 5462 days 1%
Leanne Rogan 5/10 5462 days 1%
Joanne Clarke 8/10 5466 days 1%
Wolfgang G 9/10 5472 days 1%
Thomas Signes 7/10 5493 days 1%
menzel 10/10 5511 days 1%
graemeh1 9/10 5512 days 1%
klinger 10/10 5512 days 1%
gereldineb 8/10 5522 days 1%
jennyb 9/10 5526 days 1%
Frank de Voogd 8/10 5532 days 1%
Jean Paul Mesnage 9/10 5538 days 1%
Hansjoerg Ehrmann 5/10 5539 days 1%
Daniel Alonso 9/10 5540 days 1%
Nigel Petrie 9/10 5551 days 1%
Tracy & Peter Cassidy 8/10 5567 days 1%
miniappleses 8/10 5589 days 1%
Josie Boyle 7/10 5700 days 1%
JanneP 9/10 5770 days 1%
Mikey 9/10 5777 days 1%
SablotniD 7/10 5781 days 1%
WiebkeS 9/10 5788 days 1%
Tanya 5/10 5789 days 1%
Jan 6/10 5789 days 1%
Viola 8/10 5791 days 1%
RowanL 7/10 5792 days 1%
VickiEngland 8/10 5800 days 1%
TomC1 8/10 5805 days 1%
AndyK 9/10 5805 days 1%
TatiamT 9/10 5805 days 1%
GillianK 8/10 5807 days 1%
EelcoK 9/10 5807 days 1%
Michael 9/10 5811 days 1%
soccaplaya14 10/10 5811 days 1%
Eugene 7/10 5813 days 1%
John 6/10 5815 days 1%
Tony 8/10 5820 days 1%
Middleton 4/10 5821 days 1%
Elise 8/10 5822 days 1%
Marie 8/10 5822 days 1%
ThomasS1 10/10 5827 days 1%
RasmusB 4/10 5829 days 1%
Simon 8/10 5834 days 1%
Phil&Joe 10/10 5836 days 1%
Marcus 7/10 5836 days 1%
Andre 7/10 5838 days 1%
Iris 9/10 5840 days 1%
Carla 7/10 5840 days 1%
Sandra 8/10 5844 days 1%
Schaffluber 10/10 5845 days 1%
Hayley 5/10 5846 days 1%
Con 2/10 5890 days 0%
felix 7/10 5891 days 1%
melissa 10/10 5897 days 1%
John B 5/10 5900 days 1%
Gemma 7/10 5938 days 1%
Henry 7/10 5939 days 1%
Antonella 10/10 5946 days 1%
Michelle 8/10 5946 days 1%
Laura 7/10 5955 days 1%
Sarah 8/10 5969 days 1%
Katerina 7/10 5990 days 1%
Erin 3/10 5990 days 1%
Mike Knight 9/10 6011 days 1%
Bronagh Mcartan 8/10 6020 days 1%
Dave 8/10 6031 days 1%
fgregory 10/10 6034 days 1%
Rhea 6/10 6080 days 1%
Georgina Mulligan 8/10 6091 days 1%
Karen C 7/10 6103 days 1%
Edmund Hillstone 10/10 6121 days 1%
Toby 6/10 6144 days 1%
Jennifer Baulch 9/10 6148 days 1%
Susan 8/10 6152 days 1%
Hoetnagels 7/10 6155 days 1%
Alan Bellerby 8/10 6158 days 1%
Sanne Jonker 7/10 6159 days 1%
Renske Tehurne 8/10 6163 days 1%
Benjamin Krein 7/10 6163 days 1%
Anne and Derek 8/10 6164 days 1%
James Davies 7/10 6164 days 1%
Naomi Horton 8/10 6165 days 1%
Roger Repolusk 8/10 6169 days 1%
Tony Wicks 6/10 6169 days 1%
Nancy Dol 8/10 6169 days 1%
Kristine 10/10 6169 days 1%
Kathy Hawey 9/10 6171 days 1%
David Buckley 8/10 6172 days 1%
Lena1 6/10 6172 days 1%
John Woodrow 8/10 6173 days 1%
Carmen Dolny 10/10 6173 days 1%
Haemnerli 8/10 6177 days 1%
Carla 8/10 6184 days 1%
Jim Curley 8/10 6184 days 1%
paulonline 7/10 6189 days 1%
Bex 6/10 6199 days 1%
Jenny Hulsebosch 8/10 6200 days 1%
Melissa Steedman 8/10 6211 days 1%
Tim 7/10 6212 days 1%
Falk Seidel 7/10 6215 days 1%
Hans Olthof 8/10 6215 days 1%
Anu 9/10 6218 days 1%
Anneli 6/10 6220 days 1%
purplekat99 10/10 6228 days 1%
Connor 10/10 6241 days 1%
Ad 7/10 6241 days 1%
Ann Westmacott 5/10 6246 days 1%
Paul Cowie 8/10 6247 days 1%
Ewen Maclean 8/10 6247 days 1%
Sarah Wilton 5/10 6247 days 1%
Arend v Dyn 7/10 6249 days 1%
Linda 8/10 6253 days 1%
Fiona 7/10 6253 days 1%
Ann 7/10 6254 days 1%
ranker_584 9/10 6257 days 1%
Christine 7/10 6257 days 1%
Nina 9/10 6257 days 1%
Anthony 7/10 6262 days 1%
Tom Clements 7/10 6262 days 1%
ranker_46 8/10 6374 days 1%
Pat Brewster 8/10 6374 days 1%
FrankOosterwijk 6/10 6459 days 1%
Kim 8/10 6459 days 1%
Helen 7/10 6490 days 1%
Heather 9/10 6490 days 1%
Helene 9/10 6502 days 1%
John 7/10 6502 days 1%
Giancarlo 6/10 6502 days 1%
Annette 4/10 6526 days 1%
John 5/10 6526 days 1%
Duncan 9/10 6531 days 1%
Jen 4/10 6542 days 1%
Rolf 8/10 6550 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

-0.76% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 46 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 37 days. Adjustments are according to the following table.

Days Adjustment
34 -0.70%
35 -0.72%
36 -0.74%
37 -0.76%
38 -0.78%
39 -0.80%
40 -0.82%

Balancing Adjustment

6.70% 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.