Ranking Score Explained

Hi there, 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.

Nick Morrison's avatar

Nick Morrison

Rankers owner

Interislander Ferry

Valid Reviews

341 Valid Reviews

The Interislander Ferry experience has a total of 342 reviews. There are 341 valid reviews that are included when calculating the ranking score and 1 invalid review 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 341 valid reviews:

Rating Count Percentage
10/10 39
11%
9/10 79
23%
8/10 103
30%
7/10 62
18%
6/10 28
8%
5/10 15
4%
4/10 6
2%
3/10 5
1%
2/10 2
1%
1/10 2
1%

77.62% Average

The raw data average (mean) for all the Interislander Ferry valid reviews is 77.62% and is based on 341 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 341 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

80.11%

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
Pinocity 6/10 267 days 100%
Helen Russell 10/10 448 days 93%
NewZealander 10/10 722 days 37%
Tommy Pickett 9/10 1545 days 6%
Tom Bennett 8/10 1549 days 5%
Jeny Smolders 9/10 1551 days 6%
Gregg Wagstaff 7/10 1776 days 5%
Lianne Ijlst 8/10 1804 days 5%
Samantha and Neis 8/10 1805 days 5%
Brandon Cassidy 7/10 1821 days 4%
Vic Baughen 9/10 1823 days 5%
Anders Frank 7/10 1827 days 4%
Dina Schurer 8/10 1828 days 5%
Kim Youngsub 9/10 1829 days 5%
DEBBIE LAMBERT 10/10 1833 days 5%
Gary Williams 8/10 1833 days 5%
Kimberley Gardien 8/10 1840 days 5%
Antoine 9/10 1861 days 5%
Judit Van lanen 9/10 1866 days 5%
Bjorn Nielsen 8/10 1868 days 4%
Joel Virtanen 9/10 1870 days 5%
Corbin Hure 7/10 1870 days 4%
Ron 6/10 1873 days 4%
Thomas Simeon 8/10 1873 days 4%
Suzannah Hill 8/10 1874 days 4%
Kallan Mrozek 9/10 1875 days 5%
Kees Mol 9/10 1879 days 5%
Kristal Lavender 10/10 1879 days 5%
Bastian Bley 9/10 1880 days 5%
Jasmine Rogers 3/10 1881 days 4%
Louis Nilsson 8/10 1885 days 4%
Tim 7/10 1885 days 4%
Jendrik 6/10 1885 days 4%
Katharina 7/10 1886 days 4%
Chris Valchero 9/10 1889 days 5%
Rulp Niet 8/10 1891 days 4%
Soeren Buchheister 9/10 1892 days 5%
Chas Bronson 8/10 1892 days 4%
Jakob Lovdahl 9/10 1894 days 5%
Alexandra Schmidt 10/10 1904 days 5%
Jade Williams 10/10 1905 days 5%
Sam Staines 10/10 1906 days 5%
Nickolas Jonkergouw 7/10 1910 days 4%
Kirsty Smith 10/10 1910 days 5%
Eva Hesse 10/10 1925 days 5%
celine gries 8/10 1925 days 4%
tinagermany111 8/10 1940 days 4%
Cassandra Geyer 8/10 2124 days 4%
Olivier Reculeau 8/10 2125 days 4%
Thomas Michel 5/10 2126 days 3%
Lisa Haedrich 5/10 2130 days 3%
Nadja Guiliani 8/10 2134 days 4%
Elbrich 8/10 2134 days 4%
Jamie Serieux 7/10 2137 days 4%
Adele Jacques 9/10 2138 days 4%
Daniel Weber 6/10 2140 days 3%
Emily Noyd 8/10 2142 days 4%
Aparna Gula 10/10 2143 days 4%
Sebastiaan 7/10 2145 days 4%
Andre 9/10 2146 days 4%
Benedikt Hang 7/10 2147 days 4%
Yannick 8/10 2147 days 4%
S Black 9/10 2148 days 4%
Paul Larauze 6/10 2151 days 3%
Florence 6/10 2152 days 3%
Sarah Kovacs 8/10 2153 days 4%
Frenziska Schmid 7/10 2155 days 4%
Maud Livolsi 7/10 2162 days 4%
Lewis Whittle 6/10 2164 days 3%
Lukas Seager 6/10 2164 days 3%
Andrea Tabaka 8/10 2171 days 4%
Tina Rust 8/10 2173 days 4%
Joel Papak 8/10 2175 days 4%
Clemence and Pedro 9/10 2176 days 4%
Doms Wahlelr 9/10 2178 days 4%
Josef Biller 8/10 2178 days 4%
Justine Hoffmann 8/10 2179 days 4%
Friederike East 7/10 2179 days 4%
Mark White 10/10 2180 days 4%
Briony 8/10 2183 days 4%
Gabriel Siibers 8/10 2183 days 4%
Henry Wichler 8/10 2184 days 4%
Kyle Johnson 9/10 2186 days 4%
Niels Wezenberg 7/10 2187 days 4%
John Hamilton 9/10 2187 days 4%
Brianna Burd 9/10 2187 days 4%
Jessica Ruhland 8/10 2188 days 4%
Stula Vladimir 10/10 2189 days 4%
Cosmo Hartuna 7/10 2191 days 4%
Roland Fischer 6/10 2191 days 3%
Ross Holmes 9/10 2192 days 4%
Tilman 9/10 2194 days 4%
Petru 7/10 2195 days 3%
Fero Saarinen 6/10 2196 days 3%
Lauren Thompson 8/10 2198 days 4%
Meilin 8/10 2201 days 4%
Jonas Hoerning 10/10 2205 days 4%
Vanesha Patel 6/10 2206 days 3%
Mauricio Daniele 9/10 2206 days 4%
Sara and Antoine 8/10 2208 days 4%
Clare Pickford 6/10 2208 days 3%
Daniel Hill 10/10 2209 days 4%
Moritz Braun 7/10 2225 days 3%
Grischa Rodust 8/10 2232 days 4%
Chalie Dotesek 9/10 2233 days 4%
Julien Lafeville 7/10 2237 days 3%
Julia Huesam 8/10 2237 days 4%
Alexandre 9/10 2241 days 4%
Kev Zarka 6/10 2242 days 3%
Markus Wabing 8/10 2245 days 4%
Gessica 6/10 2278 days 3%
Simon Quass 9/10 2282 days 4%
Barthelemy 7/10 2511 days 3%
Brita Topp 10/10 2854 days 2%
Laim Thompson 8/10 2854 days 2%
Adriana 10/10 2862 days 2%
Pavel Jarolimek 5/10 2862 days 2%
Leonie Moeller 6/10 2863 days 2%
Doreen Gendel 8/10 2864 days 2%
Carla Oyarzun 3/10 2867 days 2%
Paolo Cases 3/10 2867 days 2%
Wolfgang and Christine 8/10 2872 days 2%
Helen 8/10 2885 days 2%
Olivier Carval 9/10 2887 days 2%
Hirsch Svenja 9/10 2888 days 2%
Mahr Svenja 8/10 2888 days 2%
Anna Guzewiez 9/10 2904 days 2%
Pier Durand 8/10 2908 days 2%
Serena Poggioli 9/10 2908 days 2%
Wayne Schist 7/10 2908 days 2%
Margreth Lydie 5/10 2916 days 2%
Laura Pleumeekers 7/10 2930 days 2%
David Brooks 10/10 2933 days 2%
Adrien Godeloup 9/10 2942 days 2%
Bet Dreno 8/10 2943 days 2%
Joachim 1/10 2944 days 1%
Pioter Jurkowski 7/10 2944 days 2%
Thomas Roche 9/10 2946 days 2%
Brian 9/10 3005 days 2%
hendrik king 9/10 3128 days 1%
Kiki Wykstra 5/10 3238 days 1%
Galen Licht 4/10 3238 days 1%
Yu-Ti Chu 7/10 3241 days 1%
Ton Martens 7/10 3241 days 1%
Joshua Perry 8/10 3246 days 1%
Molly Ladd 8/10 3246 days 1%
Michael Nolan 9/10 3250 days 1%
Julian Roots 9/10 3250 days 1%
Florent Corino 9/10 3254 days 1%
Amiot Cyriane 7/10 3254 days 1%
Annika 7/10 3254 days 1%
Jonas Herrmann 7/10 3254 days 1%
Matthieu Daveou 8/10 3254 days 1%
Julien Panossian 6/10 3254 days 1%
Raoul Montestruer 5/10 3254 days 1%
Alessa Ndra 8/10 3260 days 1%
Bjorn Hedmark 5/10 3261 days 1%
Evyatar Tulipman 7/10 3263 days 1%
S Curry 10/10 3278 days 1%
Ingrid 9/10 3322 days 1%
Reinier Timmer 7/10 3322 days 1%
Moorman 8/10 3331 days 1%
Stefan Roth 9/10 3356 days 1%
David 9/10 3370 days 1%
kevindang 10/10 3523 days 0%
Ruben Kunze 4/10 3605 days 0%
Sebastian Hol 9/10 3611 days 0%
Dick Stewart 8/10 3620 days 0%
David Beaumont 9/10 3627 days 0%
Beyeler 10/10 3632 days 0%
Nikita Sue 9/10 3637 days 0%
Schweiger 10/10 3639 days 0%
Jan & Marian 10/10 3718 days 1%
Konny 9/10 3722 days 1%
Waldemar Schuler 8/10 3722 days 1%
jule 3/10 3736 days 1%
Jack Potman 8/10 3938 days 1%
Jon_and_Family 9/10 3950 days 1%
Walker 9/10 3953 days 1%
Andreas Blessing 10/10 3961 days 1%
Gema 7/10 3964 days 1%
Avry Fabrice 6/10 3969 days 1%
Diane Johnston 9/10 3974 days 1%
Javier Munoz 8/10 3974 days 1%
Ben Akin-Smith 8/10 3975 days 1%
K Wallis 9/10 3980 days 1%
khs 9/10 3981 days 1%
Emma Ducat 9/10 3981 days 1%
Mr and Mrs Lambert 8/10 3988 days 1%
Andrew Koster 7/10 3994 days 1%
Bakker 8/10 3994 days 1%
Kimberly St Louis 8/10 3995 days 1%
Roel Wesstra 8/10 4001 days 1%
Seifert 10/10 4001 days 1%
Derek Woodward 9/10 4003 days 1%
Fabi & Sabi 8/10 4004 days 1%
Rosey834 8/10 4071 days 1%
Pete & Chris 10/10 4271 days 1%
Tony Masters 9/10 4334 days 1%
Hershell 8/10 4338 days 1%
Mike Robinson 9/10 4339 days 1%
Brent S 2/10 4340 days 1%
Zara Leyden 9/10 4348 days 1%
Judith 7/10 4352 days 1%
anon 8/10 4353 days 1%
Pierre Pilon 8/10 4354 days 1%
Jenny Omb 1/10 4359 days 1%
Frei Urs 6/10 4360 days 1%
Bryan Keddie 9/10 4370 days 1%
Leanne Rogan 5/10 4370 days 1%
Joanne Clarke 8/10 4374 days 1%
Wolfgang G 9/10 4380 days 1%
Thomas Signes 7/10 4401 days 1%
menzel 10/10 4419 days 1%
graemeh1 9/10 4420 days 1%
klinger 10/10 4420 days 1%
gereldineb 8/10 4430 days 1%
jennyb 9/10 4434 days 1%
Frank de Voogd 8/10 4440 days 1%
Jean Paul Mesnage 9/10 4446 days 1%
Hansjoerg Ehrmann 5/10 4447 days 1%
Daniel Alonso 9/10 4448 days 1%
Nigel Petrie 9/10 4459 days 1%
Tracy & Peter Cassidy 8/10 4475 days 1%
miniappleses 8/10 4497 days 1%
Josie Boyle 7/10 4608 days 1%
JanneP 9/10 4678 days 1%
Mikey 9/10 4685 days 1%
SablotniD 7/10 4689 days 1%
WiebkeS 9/10 4696 days 1%
Tanya 5/10 4697 days 1%
Jan 6/10 4698 days 1%
Viola 8/10 4699 days 1%
RowanL 7/10 4700 days 1%
VickiEngland 8/10 4708 days 1%
TomC1 8/10 4713 days 1%
AndyK 9/10 4713 days 1%
TatiamT 9/10 4713 days 1%
GillianK 8/10 4715 days 1%
EelcoK 9/10 4715 days 1%
Michael 9/10 4719 days 1%
soccaplaya14 10/10 4720 days 1%
Eugene 7/10 4721 days 1%
John 6/10 4723 days 1%
Tony 8/10 4728 days 1%
Middleton 4/10 4729 days 1%
Elise 8/10 4730 days 1%
Marie 8/10 4730 days 1%
ThomasS1 10/10 4735 days 1%
RasmusB 4/10 4737 days 1%
Simon 8/10 4742 days 1%
Phil&Joe 10/10 4744 days 1%
Marcus 7/10 4744 days 1%
Andre 7/10 4746 days 1%
Iris 9/10 4748 days 1%
Carla 7/10 4748 days 1%
Sandra 8/10 4752 days 1%
Schaffluber 10/10 4753 days 1%
Hayley 5/10 4754 days 1%
Con 2/10 4798 days 1%
felix 7/10 4799 days 1%
melissa 10/10 4806 days 1%
John B 5/10 4808 days 1%
Gemma 7/10 4847 days 1%
Henry 7/10 4847 days 1%
Antonella 10/10 4854 days 1%
Michelle 8/10 4854 days 1%
Laura 7/10 4863 days 1%
Sarah 8/10 4878 days 1%
Katerina 7/10 4898 days 1%
Erin 3/10 4898 days 1%
Mike Knight 9/10 4919 days 1%
Bronagh Mcartan 8/10 4928 days 1%
Dave 8/10 4939 days 1%
fgregory 10/10 4942 days 1%
Rhea 6/10 4988 days 1%
Georgina Mulligan 8/10 5000 days 1%
Karen C 7/10 5012 days 1%
Edmund Hillstone 10/10 5029 days 1%
Toby 6/10 5052 days 1%
Jennifer Baulch 9/10 5056 days 1%
Susan 8/10 5060 days 1%
Hoetnagels 7/10 5063 days 1%
Alan Bellerby 8/10 5066 days 1%
Sanne Jonker 7/10 5067 days 1%
Renske Tehurne 8/10 5071 days 1%
Benjamin Krein 7/10 5071 days 1%
Anne and Derek 8/10 5072 days 1%
James Davies 7/10 5072 days 1%
Naomi Horton 8/10 5073 days 1%
Roger Repolusk 8/10 5077 days 1%
Tony Wicks 6/10 5077 days 1%
Nancy Dol 8/10 5077 days 1%
Kristine 10/10 5077 days 1%
Kathy Hawey 9/10 5079 days 1%
David Buckley 8/10 5080 days 1%
Lena1 6/10 5080 days 1%
John Woodrow 8/10 5081 days 1%
Carmen Dolny 10/10 5081 days 1%
Haemnerli 8/10 5085 days 1%
Carla 8/10 5092 days 1%
Jim Curley 8/10 5092 days 1%
paulonline 7/10 5098 days 1%
Bex 6/10 5107 days 1%
Jenny Hulsebosch 8/10 5108 days 1%
Melissa Steedman 8/10 5119 days 1%
Tim 7/10 5120 days 1%
Falk Seidel 7/10 5123 days 1%
Hans Olthof 8/10 5123 days 1%
Anu 9/10 5126 days 1%
Anneli 6/10 5128 days 1%
purplekat99 10/10 5136 days 1%
Connor 10/10 5149 days 1%
Ad 7/10 5149 days 1%
Ann Westmacott 5/10 5154 days 1%
Paul Cowie 8/10 5155 days 1%
Ewen Maclean 8/10 5155 days 1%
Sarah Wilton 5/10 5155 days 1%
Arend v Dyn 7/10 5157 days 1%
Linda 8/10 5161 days 1%
Fiona 7/10 5161 days 1%
Ann 7/10 5162 days 1%
ranker_584 9/10 5165 days 1%
Christine 7/10 5165 days 1%
Nina 9/10 5165 days 1%
Anthony 7/10 5170 days 1%
Tom Clements 7/10 5170 days 1%
ranker_46 8/10 5282 days 1%
Pat Brewster 8/10 5282 days 1%
FrankOosterwijk 6/10 5367 days 1%
Kim 8/10 5367 days 1%
Helen 7/10 5398 days 1%
Heather 9/10 5398 days 1%
Helene 9/10 5410 days 1%
John 7/10 5410 days 1%
Giancarlo 6/10 5410 days 1%
Annette 4/10 5434 days 1%
John 5/10 5434 days 1%
Duncan 9/10 5439 days 1%
Jen 4/10 5450 days 1%
Rolf 8/10 5458 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

-4.11% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 48 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 200 days. Adjustments are according to the following table.

Days Adjustment
197 -4.05%
198 -4.07%
199 -4.09%
200 -4.11%
201 -4.13%
202 -4.16%
203 -4.18%

Final Ranking Score

76%

The final ranking score once adjustments and rounding has been applied. This value is cached and recalculated each day. Therefore it may not be precisely accurate based on the other values presented.

If you have any questions or comments about our ranking score calculation please get in touch at info@rankers.co.nz.