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

80.61%

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 6/10 170 days 98%
Helen Russell 10/10 351 days 100%
NewZealander 10/10 625 days 50%
Tommy Pickett 9/10 1448 days 5%
Tom Bennett 8/10 1452 days 5%
Jeny Smolders 9/10 1454 days 5%
Gregg Wagstaff 7/10 1679 days 4%
Lianne Ijlst 8/10 1707 days 4%
Samantha and Neis 8/10 1708 days 4%
Brandon Cassidy 7/10 1724 days 4%
Vic Baughen 9/10 1726 days 5%
Anders Frank 7/10 1730 days 4%
Dina Schurer 8/10 1731 days 4%
Kim Youngsub 9/10 1732 days 5%
DEBBIE LAMBERT 10/10 1736 days 5%
Gary Williams 8/10 1736 days 4%
Kimberley Gardien 8/10 1743 days 4%
Antoine 9/10 1764 days 5%
Judit Van lanen 9/10 1769 days 5%
Bjorn Nielsen 8/10 1771 days 4%
Joel Virtanen 9/10 1773 days 5%
Corbin Hure 7/10 1773 days 4%
Ron 6/10 1776 days 4%
Thomas Simeon 8/10 1776 days 4%
Suzannah Hill 8/10 1777 days 4%
Kallan Mrozek 9/10 1778 days 5%
Kees Mol 9/10 1782 days 5%
Kristal Lavender 10/10 1782 days 5%
Bastian Bley 9/10 1783 days 5%
Jasmine Rogers 3/10 1784 days 3%
Louis Nilsson 8/10 1788 days 4%
Tim 7/10 1788 days 4%
Jendrik 6/10 1788 days 4%
Katharina 7/10 1789 days 4%
Chris Valchero 9/10 1792 days 4%
Rulp Niet 8/10 1794 days 4%
Soeren Buchheister 9/10 1795 days 4%
Chas Bronson 8/10 1795 days 4%
Jakob Lovdahl 9/10 1797 days 4%
Alexandra Schmidt 10/10 1807 days 4%
Jade Williams 10/10 1808 days 4%
Sam Staines 10/10 1809 days 4%
Nickolas Jonkergouw 7/10 1813 days 4%
Kirsty Smith 10/10 1813 days 4%
Eva Hesse 10/10 1828 days 4%
celine gries 8/10 1828 days 4%
tinagermany111 8/10 1843 days 4%
Cassandra Geyer 8/10 2027 days 4%
Olivier Reculeau 8/10 2028 days 4%
Thomas Michel 5/10 2029 days 3%
Lisa Haedrich 5/10 2033 days 3%
Nadja Guiliani 8/10 2037 days 4%
Elbrich 8/10 2037 days 4%
Jamie Serieux 7/10 2040 days 4%
Adele Jacques 9/10 2041 days 4%
Daniel Weber 6/10 2043 days 3%
Emily Noyd 8/10 2045 days 4%
Aparna Gula 10/10 2046 days 4%
Sebastiaan 7/10 2048 days 4%
Andre 9/10 2049 days 4%
Benedikt Hang 7/10 2050 days 4%
Yannick 8/10 2050 days 4%
S Black 9/10 2051 days 4%
Paul Larauze 6/10 2054 days 3%
Florence 6/10 2055 days 3%
Sarah Kovacs 8/10 2056 days 4%
Frenziska Schmid 7/10 2058 days 4%
Maud Livolsi 7/10 2065 days 3%
Lewis Whittle 6/10 2067 days 3%
Lukas Seager 6/10 2067 days 3%
Andrea Tabaka 8/10 2074 days 4%
Tina Rust 8/10 2076 days 4%
Joel Papak 8/10 2078 days 4%
Clemence and Pedro 9/10 2079 days 4%
Doms Wahlelr 9/10 2081 days 4%
Josef Biller 8/10 2081 days 4%
Justine Hoffmann 8/10 2082 days 4%
Friederike East 7/10 2082 days 3%
Mark White 10/10 2083 days 4%
Briony 8/10 2086 days 4%
Gabriel Siibers 8/10 2086 days 4%
Henry Wichler 8/10 2087 days 4%
Kyle Johnson 9/10 2089 days 4%
Niels Wezenberg 7/10 2090 days 3%
John Hamilton 9/10 2090 days 4%
Brianna Burd 9/10 2090 days 4%
Jessica Ruhland 8/10 2091 days 4%
Stula Vladimir 10/10 2092 days 4%
Cosmo Hartuna 7/10 2094 days 3%
Roland Fischer 6/10 2094 days 3%
Ross Holmes 9/10 2095 days 4%
Tilman 9/10 2097 days 4%
Petru 7/10 2098 days 3%
Fero Saarinen 6/10 2099 days 3%
Lauren Thompson 8/10 2101 days 4%
Meilin 8/10 2104 days 4%
Jonas Hoerning 10/10 2108 days 4%
Vanesha Patel 6/10 2109 days 3%
Mauricio Daniele 9/10 2109 days 4%
Sara and Antoine 8/10 2111 days 4%
Clare Pickford 6/10 2111 days 3%
Daniel Hill 10/10 2112 days 4%
Moritz Braun 7/10 2128 days 3%
Grischa Rodust 8/10 2135 days 3%
Chalie Dotesek 9/10 2136 days 4%
Julien Lafeville 7/10 2140 days 3%
Julia Huesam 8/10 2140 days 3%
Alexandre 9/10 2144 days 4%
Kev Zarka 6/10 2145 days 3%
Markus Wabing 8/10 2148 days 3%
Gessica 6/10 2181 days 3%
Simon Quass 9/10 2185 days 4%
Barthelemy 7/10 2414 days 3%
Brita Topp 10/10 2757 days 2%
Laim Thompson 8/10 2757 days 2%
Adriana 10/10 2765 days 2%
Pavel Jarolimek 5/10 2765 days 2%
Leonie Moeller 6/10 2766 days 2%
Doreen Gendel 8/10 2767 days 2%
Carla Oyarzun 3/10 2770 days 2%
Paolo Cases 3/10 2770 days 2%
Wolfgang and Christine 8/10 2775 days 2%
Helen 8/10 2788 days 2%
Olivier Carval 9/10 2790 days 2%
Hirsch Svenja 9/10 2791 days 2%
Mahr Svenja 8/10 2791 days 2%
Anna Guzewiez 9/10 2807 days 2%
Pier Durand 8/10 2811 days 2%
Serena Poggioli 9/10 2811 days 2%
Wayne Schist 7/10 2811 days 2%
Margreth Lydie 5/10 2819 days 2%
Laura Pleumeekers 7/10 2833 days 2%
David Brooks 10/10 2836 days 2%
Adrien Godeloup 9/10 2845 days 2%
Bet Dreno 8/10 2846 days 2%
Joachim 1/10 2847 days 1%
Pioter Jurkowski 7/10 2847 days 2%
Thomas Roche 9/10 2849 days 2%
Brian 9/10 2908 days 2%
hendrik king 9/10 3031 days 1%
Kiki Wykstra 5/10 3141 days 1%
Galen Licht 4/10 3141 days 1%
Yu-Ti Chu 7/10 3144 days 1%
Ton Martens 7/10 3144 days 1%
Joshua Perry 8/10 3149 days 1%
Molly Ladd 8/10 3149 days 1%
Michael Nolan 9/10 3153 days 1%
Julian Roots 9/10 3153 days 1%
Florent Corino 9/10 3157 days 1%
Amiot Cyriane 7/10 3157 days 1%
Annika 7/10 3157 days 1%
Jonas Herrmann 7/10 3157 days 1%
Matthieu Daveou 8/10 3157 days 1%
Julien Panossian 6/10 3157 days 1%
Raoul Montestruer 5/10 3157 days 1%
Alessa Ndra 8/10 3163 days 1%
Bjorn Hedmark 5/10 3164 days 1%
Evyatar Tulipman 7/10 3166 days 1%
S Curry 10/10 3181 days 1%
Ingrid 9/10 3225 days 1%
Reinier Timmer 7/10 3225 days 1%
Moorman 8/10 3234 days 1%
Stefan Roth 9/10 3259 days 1%
David 9/10 3273 days 1%
kevindang 10/10 3426 days 1%
Ruben Kunze 4/10 3508 days 0%
Sebastian Hol 9/10 3514 days 0%
Dick Stewart 8/10 3523 days 0%
David Beaumont 9/10 3530 days 0%
Beyeler 10/10 3535 days 0%
Nikita Sue 9/10 3540 days 0%
Schweiger 10/10 3542 days 0%
Jan & Marian 10/10 3621 days 0%
Konny 9/10 3625 days 0%
Waldemar Schuler 8/10 3625 days 0%
jule 3/10 3639 days 0%
Jack Potman 8/10 3841 days 1%
Jon_and_Family 9/10 3853 days 1%
Walker 9/10 3856 days 1%
Andreas Blessing 10/10 3864 days 1%
Gema 7/10 3867 days 1%
Avry Fabrice 6/10 3872 days 1%
Diane Johnston 9/10 3877 days 1%
Javier Munoz 8/10 3877 days 1%
Ben Akin-Smith 8/10 3878 days 1%
K Wallis 9/10 3883 days 1%
khs 9/10 3884 days 1%
Emma Ducat 9/10 3884 days 1%
Mr and Mrs Lambert 8/10 3891 days 1%
Andrew Koster 7/10 3897 days 1%
Bakker 8/10 3897 days 1%
Kimberly St Louis 8/10 3898 days 1%
Roel Wesstra 8/10 3904 days 1%
Seifert 10/10 3904 days 1%
Derek Woodward 9/10 3906 days 1%
Fabi & Sabi 8/10 3907 days 1%
Rosey834 8/10 3974 days 1%
Pete & Chris 10/10 4174 days 1%
Tony Masters 9/10 4237 days 1%
Hershell 8/10 4241 days 1%
Mike Robinson 9/10 4242 days 1%
Brent S 2/10 4243 days 1%
Zara Leyden 9/10 4251 days 1%
Judith 7/10 4255 days 1%
anon 8/10 4256 days 1%
Pierre Pilon 8/10 4257 days 1%
Jenny Omb 1/10 4262 days 1%
Frei Urs 6/10 4263 days 1%
Bryan Keddie 9/10 4273 days 1%
Leanne Rogan 5/10 4273 days 1%
Joanne Clarke 8/10 4277 days 1%
Wolfgang G 9/10 4283 days 1%
Thomas Signes 7/10 4304 days 1%
menzel 10/10 4322 days 1%
graemeh1 9/10 4323 days 1%
klinger 10/10 4323 days 1%
gereldineb 8/10 4333 days 1%
jennyb 9/10 4337 days 1%
Frank de Voogd 8/10 4343 days 1%
Jean Paul Mesnage 9/10 4349 days 1%
Hansjoerg Ehrmann 5/10 4350 days 1%
Daniel Alonso 9/10 4351 days 1%
Nigel Petrie 9/10 4362 days 1%
Tracy & Peter Cassidy 8/10 4378 days 1%
miniappleses 8/10 4400 days 1%
Josie Boyle 7/10 4511 days 1%
JanneP 9/10 4581 days 1%
Mikey 9/10 4588 days 1%
SablotniD 7/10 4593 days 1%
WiebkeS 9/10 4599 days 1%
Tanya 5/10 4601 days 1%
Jan 6/10 4601 days 1%
Viola 8/10 4603 days 1%
RowanL 7/10 4603 days 1%
VickiEngland 8/10 4611 days 1%
TomC1 8/10 4616 days 1%
AndyK 9/10 4616 days 1%
TatiamT 9/10 4616 days 1%
GillianK 8/10 4618 days 1%
EelcoK 9/10 4618 days 1%
Michael 9/10 4623 days 1%
soccaplaya14 10/10 4623 days 1%
Eugene 7/10 4625 days 1%
John 6/10 4627 days 1%
Tony 8/10 4632 days 1%
Middleton 4/10 4633 days 1%
Elise 8/10 4634 days 1%
Marie 8/10 4634 days 1%
ThomasS1 10/10 4638 days 1%
RasmusB 4/10 4640 days 1%
Simon 8/10 4645 days 1%
Phil&Joe 10/10 4648 days 1%
Marcus 7/10 4648 days 1%
Andre 7/10 4650 days 1%
Iris 9/10 4652 days 1%
Carla 7/10 4652 days 1%
Sandra 8/10 4656 days 1%
Schaffluber 10/10 4657 days 1%
Hayley 5/10 4657 days 1%
Con 2/10 4702 days 1%
felix 7/10 4703 days 1%
melissa 10/10 4709 days 1%
John B 5/10 4711 days 1%
Gemma 7/10 4750 days 1%
Henry 7/10 4751 days 1%
Antonella 10/10 4758 days 1%
Michelle 8/10 4758 days 1%
Laura 7/10 4767 days 1%
Sarah 8/10 4781 days 1%
Katerina 7/10 4802 days 1%
Erin 3/10 4802 days 1%
Mike Knight 9/10 4823 days 1%
Bronagh Mcartan 8/10 4832 days 1%
Dave 8/10 4843 days 1%
fgregory 10/10 4846 days 1%
Rhea 6/10 4891 days 1%
Georgina Mulligan 8/10 4903 days 1%
Karen C 7/10 4915 days 1%
Edmund Hillstone 10/10 4933 days 1%
Toby 6/10 4955 days 1%
Jennifer Baulch 9/10 4959 days 1%
Susan 8/10 4963 days 1%
Hoetnagels 7/10 4966 days 1%
Alan Bellerby 8/10 4969 days 1%
Sanne Jonker 7/10 4970 days 1%
Renske Tehurne 8/10 4974 days 1%
Benjamin Krein 7/10 4974 days 1%
Anne and Derek 8/10 4975 days 1%
James Davies 7/10 4975 days 1%
Naomi Horton 8/10 4976 days 1%
Roger Repolusk 8/10 4980 days 1%
Tony Wicks 6/10 4980 days 1%
Nancy Dol 8/10 4980 days 1%
Kristine 10/10 4980 days 1%
Kathy Hawey 9/10 4982 days 1%
David Buckley 8/10 4983 days 1%
Lena1 6/10 4984 days 1%
John Woodrow 8/10 4984 days 1%
Carmen Dolny 10/10 4984 days 1%
Haemnerli 8/10 4988 days 1%
Carla 8/10 4995 days 1%
Jim Curley 8/10 4995 days 1%
paulonline 7/10 5001 days 1%
Bex 6/10 5011 days 1%
Jenny Hulsebosch 8/10 5011 days 1%
Melissa Steedman 8/10 5022 days 1%
Tim 7/10 5023 days 1%
Falk Seidel 7/10 5026 days 1%
Hans Olthof 8/10 5026 days 1%
Anu 9/10 5029 days 1%
Anneli 6/10 5031 days 1%
purplekat99 10/10 5039 days 1%
Connor 10/10 5052 days 1%
Ad 7/10 5052 days 1%
Ann Westmacott 5/10 5057 days 1%
Paul Cowie 8/10 5058 days 1%
Ewen Maclean 8/10 5058 days 1%
Sarah Wilton 5/10 5058 days 1%
Arend v Dyn 7/10 5060 days 1%
Linda 8/10 5064 days 1%
Fiona 7/10 5064 days 1%
Ann 7/10 5065 days 1%
ranker_584 9/10 5068 days 1%
Christine 7/10 5068 days 1%
Nina 9/10 5068 days 1%
Anthony 7/10 5073 days 1%
Tom Clements 7/10 5073 days 1%
ranker_46 8/10 5185 days 1%
Pat Brewster 8/10 5185 days 1%
FrankOosterwijk 6/10 5270 days 1%
Kim 8/10 5270 days 1%
Helen 7/10 5301 days 1%
Heather 9/10 5301 days 1%
Helene 9/10 5313 days 1%
John 7/10 5313 days 1%
Giancarlo 6/10 5313 days 1%
Annette 4/10 5337 days 1%
John 5/10 5337 days 1%
Duncan 9/10 5342 days 1%
Jen 4/10 5353 days 1%
Rolf 8/10 5361 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

-2.70% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 58 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 149 days. Adjustments are according to the following table.

Days Adjustment
146 -2.64%
147 -2.66%
148 -2.68%
149 -2.70%
150 -2.72%
151 -2.73%
152 -2.75%

Final Ranking Score

78%

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.