Interislander Ferry

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

Rankers Owner

Valid Reviews

351 Valid Reviews

The Interislander Ferry experience has a total of 363 reviews. There are 351 valid reviews that are included when calculating the ranking score and 12 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 351 valid reviews:

Rating	Count
10/10	41	12%
9/10	81	23%
8/10	103	29%
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	5	1%

77.01% Average

The raw data average (mean) for all the Interislander Ferry valid reviews is 77.01% and is based on 351 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 351 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
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

73.93%

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
Ruban K	1/10	44 days	41%
Maria Longstaff	10/10	75 days	100%
Rina	9/10	197 days	97%
edm	1/10	471 days	36%
Colin Barrow	9/10	532 days	83%
Pauline	6/10	685 days	63%
Megan	5/10	837 days	46%
Marjolaine Loitz	4/10	867 days	37%
Keli Knox	10/10	1202 days	27%
Yar	1/10	1416 days	6%
Pinocity	6/10	1781 days	4%
Helen Russell	10/10	1962 days	5%
NewZealander	10/10	2236 days	4%
Tommy Pickett	9/10	3059 days	3%
Tom Bennett	8/10	3063 days	3%
Jeny Smolders	9/10	3065 days	3%
Gregg Wagstaff	7/10	3290 days	2%
Lianne Ijlst	8/10	3318 days	2%
Samantha and Neis	8/10	3319 days	2%
Brandon Cassidy	7/10	3335 days	2%
Vic Baughen	9/10	3337 days	2%
Anders Frank	7/10	3341 days	2%
Dina Schurer	8/10	3342 days	2%
Kim Youngsub	9/10	3343 days	2%
DEBBIE LAMBERT	10/10	3347 days	2%
Gary Williams	8/10	3347 days	2%
Kimberley Gardien	8/10	3354 days	2%
Antoine	9/10	3375 days	2%
Judit Van lanen	9/10	3380 days	2%
Bjorn Nielsen	8/10	3382 days	2%
Joel Virtanen	9/10	3384 days	2%
Corbin Hure	7/10	3384 days	2%
Ron	6/10	3387 days	2%
Thomas Simeon	8/10	3387 days	2%
Suzannah Hill	8/10	3388 days	2%
Kallan Mrozek	9/10	3389 days	2%
Kees Mol	9/10	3393 days	2%
Kristal Lavender	10/10	3393 days	2%
Bastian Bley	9/10	3394 days	2%
Jasmine Rogers	3/10	3395 days	1%
Louis Nilsson	8/10	3399 days	2%
Tim	7/10	3399 days	2%
Jendrik	6/10	3399 days	2%
Katharina	7/10	3400 days	2%
Chris Valchero	9/10	3403 days	2%
Rulp Niet	8/10	3405 days	2%
Soeren Buchheister	9/10	3406 days	2%
Chas Bronson	8/10	3406 days	2%
Jakob Lovdahl	9/10	3408 days	2%
Alexandra Schmidt	10/10	3418 days	2%
Jade Williams	10/10	3419 days	2%
Sam Staines	10/10	3420 days	2%
Nickolas Jonkergouw	7/10	3424 days	2%
Kirsty Smith	10/10	3424 days	2%
Eva Hesse	10/10	3439 days	2%
celine gries	8/10	3439 days	2%
tinagermany111	8/10	3454 days	2%
Cassandra Geyer	8/10	3638 days	1%
Olivier Reculeau	8/10	3639 days	1%
Thomas Michel	5/10	3640 days	1%
Lisa Haedrich	5/10	3644 days	1%
Nadja Guiliani	8/10	3648 days	1%
Elbrich	8/10	3648 days	1%
Jamie Serieux	7/10	3651 days	1%
Adele Jacques	9/10	3652 days	1%
Daniel Weber	6/10	3654 days	1%
Emily Noyd	8/10	3656 days	1%
Aparna Gula	10/10	3657 days	1%
Sebastiaan	7/10	3659 days	1%
Andre	9/10	3660 days	1%
Benedikt Hang	7/10	3661 days	1%
Yannick	8/10	3661 days	1%
S Black	9/10	3662 days	1%
Paul Larauze	6/10	3665 days	1%
Florence	6/10	3666 days	1%
Sarah Kovacs	8/10	3667 days	1%
Frenziska Schmid	7/10	3669 days	1%
Maud Livolsi	7/10	3676 days	1%
Lewis Whittle	6/10	3678 days	1%
Lukas Seager	6/10	3678 days	1%
Andrea Tabaka	8/10	3685 days	1%
Tina Rust	8/10	3687 days	1%
Joel Papak	8/10	3689 days	1%
Clemence and Pedro	9/10	3690 days	1%
Doms Wahlelr	9/10	3692 days	1%
Josef Biller	8/10	3692 days	1%
Justine Hoffmann	8/10	3693 days	1%
Friederike East	7/10	3693 days	1%
Mark White	10/10	3694 days	1%
Briony	8/10	3697 days	1%
Gabriel Siibers	8/10	3697 days	1%
Henry Wichler	8/10	3698 days	1%
Kyle Johnson	9/10	3700 days	1%
Niels Wezenberg	7/10	3701 days	1%
John Hamilton	9/10	3701 days	1%
Brianna Burd	9/10	3701 days	1%
Jessica Ruhland	8/10	3702 days	1%
Stula Vladimir	10/10	3703 days	1%
Cosmo Hartuna	7/10	3705 days	1%
Roland Fischer	6/10	3705 days	1%
Ross Holmes	9/10	3706 days	1%
Tilman	9/10	3708 days	1%
Petru	7/10	3709 days	1%
Fero Saarinen	6/10	3710 days	1%
Lauren Thompson	8/10	3712 days	1%
Meilin	8/10	3715 days	1%
Jonas Hoerning	10/10	3719 days	1%
Vanesha Patel	6/10	3720 days	1%
Mauricio Daniele	9/10	3720 days	1%
Sara and Antoine	8/10	3722 days	1%
Clare Pickford	6/10	3722 days	1%
Daniel Hill	10/10	3723 days	1%
Moritz Braun	7/10	3739 days	1%
Grischa Rodust	8/10	3746 days	1%
Chalie Dotesek	9/10	3747 days	1%
Julien Lafeville	7/10	3751 days	1%
Julia Huesam	8/10	3751 days	1%
Alexandre	9/10	3755 days	1%
Kev Zarka	6/10	3756 days	1%
Markus Wabing	8/10	3759 days	1%
Gessica	6/10	3792 days	1%
Simon Quass	9/10	3796 days	1%
Barthelemy	7/10	4025 days	1%
Brita Topp	10/10	4368 days	0%
Laim Thompson	8/10	4368 days	0%
Adriana	10/10	4376 days	0%
Pavel Jarolimek	5/10	4376 days	0%
Leonie Moeller	6/10	4377 days	0%
Doreen Gendel	8/10	4378 days	0%
Carla Oyarzun	3/10	4381 days	1%
Paolo Cases	3/10	4381 days	1%
Wolfgang and Christine	8/10	4386 days	1%
Helen	8/10	4399 days	1%
Olivier Carval	9/10	4401 days	1%
Hirsch Svenja	9/10	4402 days	1%
Mahr Svenja	8/10	4402 days	1%
Anna Guzewiez	9/10	4418 days	1%
Pier Durand	8/10	4422 days	1%
Serena Poggioli	9/10	4422 days	1%
Wayne Schist	7/10	4422 days	1%
Margreth Lydie	5/10	4430 days	1%
Laura Pleumeekers	7/10	4444 days	1%
David Brooks	10/10	4447 days	1%
Adrien Godeloup	9/10	4456 days	1%
Bet Dreno	8/10	4457 days	1%
Joachim	1/10	4458 days	0%
Pioter Jurkowski	7/10	4458 days	1%
Thomas Roche	9/10	4460 days	1%
Brian	9/10	4519 days	1%
hendrik king	9/10	4642 days	1%
Kiki Wykstra	5/10	4752 days	1%
Galen Licht	4/10	4752 days	1%
Yu-Ti Chu	7/10	4755 days	1%
Ton Martens	7/10	4755 days	1%
Joshua Perry	8/10	4760 days	1%
Molly Ladd	8/10	4760 days	1%
Michael Nolan	9/10	4764 days	1%
Julian Roots	9/10	4764 days	1%
Florent Corino	9/10	4768 days	1%
Amiot Cyriane	7/10	4768 days	1%
Annika	7/10	4768 days	1%
Jonas Herrmann	7/10	4768 days	1%
Matthieu Daveou	8/10	4768 days	1%
Julien Panossian	6/10	4768 days	1%
Raoul Montestruer	5/10	4768 days	1%
Alessa Ndra	8/10	4774 days	1%
Bjorn Hedmark	5/10	4775 days	1%
Evyatar Tulipman	7/10	4777 days	1%
S Curry	10/10	4792 days	1%
Ingrid	9/10	4836 days	1%
Reinier Timmer	7/10	4836 days	1%
Moorman	8/10	4845 days	1%
Stefan Roth	9/10	4870 days	1%
David	9/10	4884 days	1%
kevindang	10/10	5037 days	1%
Ruben Kunze	4/10	5119 days	1%
Sebastian Hol	9/10	5125 days	1%
Dick Stewart	8/10	5134 days	1%
David Beaumont	9/10	5141 days	1%
Beyeler	10/10	5146 days	1%
Nikita Sue	9/10	5151 days	1%
Schweiger	10/10	5153 days	1%
Jan & Marian	10/10	5232 days	1%
Konny	9/10	5236 days	1%
Waldemar Schuler	8/10	5236 days	1%
jule	3/10	5250 days	1%
Jack Potman	8/10	5452 days	1%
Jon_and_Family	9/10	5464 days	1%
Walker	9/10	5467 days	1%
Andreas Blessing	10/10	5475 days	1%
Gema	7/10	5478 days	1%
Avry Fabrice	6/10	5483 days	1%
Diane Johnston	9/10	5488 days	1%
Javier Munoz	8/10	5488 days	1%
Ben Akin-Smith	8/10	5489 days	1%
K Wallis	9/10	5494 days	1%
khs	9/10	5495 days	1%
Emma Ducat	9/10	5495 days	1%
Mr and Mrs Lambert	8/10	5502 days	1%
Andrew Koster	7/10	5508 days	1%
Bakker	8/10	5508 days	1%
Kimberly St Louis	8/10	5509 days	1%
Roel Wesstra	8/10	5515 days	1%
Seifert	10/10	5515 days	1%
Derek Woodward	9/10	5517 days	1%
Fabi & Sabi	8/10	5518 days	1%
Rosey834	8/10	5585 days	1%
Pete & Chris	10/10	5785 days	1%
Tony Masters	9/10	5848 days	1%
Hershell	8/10	5852 days	1%
Mike Robinson	9/10	5853 days	1%
Brent S	2/10	5854 days	0%
Zara Leyden	9/10	5862 days	1%
Judith	7/10	5866 days	1%
anon	8/10	5867 days	1%
Pierre Pilon	8/10	5868 days	1%
Jenny Omb	1/10	5873 days	0%
Frei Urs	6/10	5874 days	1%
Bryan Keddie	9/10	5884 days	1%
Leanne Rogan	5/10	5884 days	1%
Joanne Clarke	8/10	5888 days	1%
Wolfgang G	9/10	5894 days	1%
Thomas Signes	7/10	5915 days	1%
menzel	10/10	5933 days	1%
graemeh1	9/10	5934 days	1%
klinger	10/10	5934 days	1%
gereldineb	8/10	5944 days	1%
jennyb	9/10	5948 days	1%
Frank de Voogd	8/10	5954 days	1%
Jean Paul Mesnage	9/10	5960 days	1%
Hansjoerg Ehrmann	5/10	5961 days	1%
Daniel Alonso	9/10	5962 days	1%
Nigel Petrie	9/10	5973 days	1%
Tracy & Peter Cassidy	8/10	5989 days	1%
miniappleses	8/10	6011 days	1%
Josie Boyle	7/10	6122 days	1%
JanneP	9/10	6192 days	1%
Mikey	9/10	6199 days	1%
SablotniD	7/10	6204 days	1%
WiebkeS	9/10	6210 days	1%
Tanya	5/10	6211 days	1%
Jan	6/10	6212 days	1%
Viola	8/10	6213 days	1%
RowanL	7/10	6214 days	1%
VickiEngland	8/10	6222 days	1%
TomC1	8/10	6227 days	1%
AndyK	9/10	6227 days	1%
TatiamT	9/10	6227 days	1%
GillianK	8/10	6229 days	1%
EelcoK	9/10	6229 days	1%
Michael	9/10	6233 days	1%
soccaplaya14	10/10	6234 days	1%
Eugene	7/10	6235 days	1%
John	6/10	6237 days	1%
Tony	8/10	6242 days	1%
Middleton	4/10	6243 days	1%
Elise	8/10	6245 days	1%
Marie	8/10	6245 days	1%
ThomasS1	10/10	6249 days	1%
RasmusB	4/10	6251 days	1%
Simon	8/10	6256 days	1%
Phil&Joe	10/10	6259 days	1%
Marcus	7/10	6259 days	1%
Andre	7/10	6260 days	1%
Iris	9/10	6262 days	1%
Carla	7/10	6262 days	1%
Sandra	8/10	6266 days	1%
Schaffluber	10/10	6267 days	1%
Hayley	5/10	6268 days	1%
Con	2/10	6312 days	0%
felix	7/10	6313 days	1%
melissa	10/10	6320 days	1%
John B	5/10	6322 days	1%
Gemma	7/10	6361 days	1%
Henry	7/10	6361 days	1%
Antonella	10/10	6369 days	1%
Michelle	8/10	6369 days	1%
Laura	7/10	6377 days	1%
Sarah	8/10	6392 days	1%
Katerina	7/10	6412 days	1%
Erin	3/10	6413 days	1%
Mike Knight	9/10	6434 days	1%
Bronagh Mcartan	8/10	6442 days	1%
Dave	8/10	6453 days	1%
fgregory	10/10	6457 days	1%
Rhea	6/10	6502 days	1%
Georgina Mulligan	8/10	6514 days	1%
Karen C	7/10	6526 days	1%
Edmund Hillstone	10/10	6543 days	1%
Toby	6/10	6566 days	1%
Jennifer Baulch	9/10	6570 days	1%
Susan	8/10	6574 days	1%
Hoetnagels	7/10	6577 days	1%
Alan Bellerby	8/10	6580 days	1%
Sanne Jonker	7/10	6581 days	1%
Renske Tehurne	8/10	6585 days	1%
Benjamin Krein	7/10	6585 days	1%
Anne and Derek	8/10	6586 days	1%
James Davies	7/10	6586 days	1%
Naomi Horton	8/10	6587 days	1%
Roger Repolusk	8/10	6591 days	1%
Tony Wicks	6/10	6591 days	1%
Nancy Dol	8/10	6591 days	1%
Kristine	10/10	6591 days	1%
Kathy Hawey	9/10	6593 days	1%
David Buckley	8/10	6594 days	1%
Lena1	6/10	6594 days	1%
John Woodrow	8/10	6595 days	1%
Carmen Dolny	10/10	6595 days	1%
Haemnerli	8/10	6599 days	1%
Carla	8/10	6606 days	1%
Jim Curley	8/10	6606 days	1%
paulonline	7/10	6612 days	1%
Bex	6/10	6621 days	1%
Jenny Hulsebosch	8/10	6622 days	1%
Melissa Steedman	8/10	6633 days	1%
Tim	7/10	6634 days	1%
Falk Seidel	7/10	6637 days	1%
Hans Olthof	8/10	6637 days	1%
Anu	9/10	6640 days	1%
Anneli	6/10	6642 days	1%
purplekat99	10/10	6650 days	1%
Connor	10/10	6663 days	1%
Ad	7/10	6663 days	1%
Ann Westmacott	5/10	6668 days	1%
Paul Cowie	8/10	6669 days	1%
Ewen Maclean	8/10	6669 days	1%
Sarah Wilton	5/10	6669 days	1%
Arend v Dyn	7/10	6671 days	1%
Linda	8/10	6675 days	1%
Fiona	7/10	6675 days	1%
Ann	7/10	6676 days	1%
ranker_584	9/10	6679 days	1%
Christine	7/10	6679 days	1%
Nina	9/10	6679 days	1%
Anthony	7/10	6684 days	1%
Tom Clements	7/10	6684 days	1%
ranker_46	8/10	6796 days	1%
Pat Brewster	8/10	6796 days	1%
FrankOosterwijk	6/10	6881 days	1%
Kim	8/10	6881 days	1%
Helen	7/10	6912 days	1%
Heather	9/10	6912 days	1%
Helene	9/10	6924 days	1%
John	7/10	6924 days	1%
Giancarlo	6/10	6924 days	1%
Annette	4/10	6948 days	1%
John	5/10	6948 days	1%
Duncan	9/10	6953 days	1%
Jen	4/10	6964 days	1%
Rolf	8/10	6972 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

-0.85% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 57 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 43 days. Adjustments are according to the following table.

Days	Adjustment
…	…
40	-0.79%
41	-0.81%
42	-0.83%
43	-0.85%
44	-0.87%
45	-0.89%
46	-0.91%
…	…

Balancing Adjustment

5.45% 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

79%

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.