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

73.96%

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	38 days	41%
Maria Longstaff	10/10	69 days	100%
Rina	9/10	191 days	97%
edm	1/10	465 days	36%
Colin Barrow	9/10	526 days	84%
Pauline	6/10	679 days	64%
Megan	5/10	831 days	46%
Marjolaine Loitz	4/10	861 days	38%
Keli Knox	10/10	1196 days	28%
Yar	1/10	1410 days	6%
Pinocity	6/10	1775 days	4%
Helen Russell	10/10	1956 days	5%
NewZealander	10/10	2230 days	4%
Tommy Pickett	9/10	3053 days	3%
Tom Bennett	8/10	3057 days	3%
Jeny Smolders	9/10	3059 days	3%
Gregg Wagstaff	7/10	3284 days	2%
Lianne Ijlst	8/10	3312 days	2%
Samantha and Neis	8/10	3313 days	2%
Brandon Cassidy	7/10	3329 days	2%
Vic Baughen	9/10	3331 days	2%
Anders Frank	7/10	3335 days	2%
Dina Schurer	8/10	3336 days	2%
Kim Youngsub	9/10	3337 days	2%
DEBBIE LAMBERT	10/10	3341 days	2%
Gary Williams	8/10	3341 days	2%
Kimberley Gardien	8/10	3348 days	2%
Antoine	9/10	3369 days	2%
Judit Van lanen	9/10	3374 days	2%
Bjorn Nielsen	8/10	3376 days	2%
Joel Virtanen	9/10	3378 days	2%
Corbin Hure	7/10	3378 days	2%
Ron	6/10	3381 days	2%
Thomas Simeon	8/10	3381 days	2%
Suzannah Hill	8/10	3382 days	2%
Kallan Mrozek	9/10	3383 days	2%
Kees Mol	9/10	3387 days	2%
Kristal Lavender	10/10	3387 days	2%
Bastian Bley	9/10	3388 days	2%
Jasmine Rogers	3/10	3389 days	1%
Louis Nilsson	8/10	3393 days	2%
Tim	7/10	3393 days	2%
Jendrik	6/10	3393 days	2%
Katharina	7/10	3394 days	2%
Chris Valchero	9/10	3397 days	2%
Rulp Niet	8/10	3399 days	2%
Soeren Buchheister	9/10	3400 days	2%
Chas Bronson	8/10	3400 days	2%
Jakob Lovdahl	9/10	3402 days	2%
Alexandra Schmidt	10/10	3412 days	2%
Jade Williams	10/10	3413 days	2%
Sam Staines	10/10	3414 days	2%
Nickolas Jonkergouw	7/10	3418 days	2%
Kirsty Smith	10/10	3418 days	2%
Eva Hesse	10/10	3433 days	2%
celine gries	8/10	3433 days	2%
tinagermany111	8/10	3447 days	2%
Cassandra Geyer	8/10	3632 days	1%
Olivier Reculeau	8/10	3633 days	1%
Thomas Michel	5/10	3634 days	1%
Lisa Haedrich	5/10	3638 days	1%
Nadja Guiliani	8/10	3642 days	1%
Elbrich	8/10	3642 days	1%
Jamie Serieux	7/10	3645 days	1%
Adele Jacques	9/10	3646 days	1%
Daniel Weber	6/10	3648 days	1%
Emily Noyd	8/10	3650 days	1%
Aparna Gula	10/10	3651 days	1%
Sebastiaan	7/10	3653 days	1%
Andre	9/10	3654 days	1%
Benedikt Hang	7/10	3655 days	1%
Yannick	8/10	3655 days	1%
S Black	9/10	3656 days	1%
Paul Larauze	6/10	3659 days	1%
Florence	6/10	3660 days	1%
Sarah Kovacs	8/10	3661 days	1%
Frenziska Schmid	7/10	3663 days	1%
Maud Livolsi	7/10	3670 days	1%
Lewis Whittle	6/10	3672 days	1%
Lukas Seager	6/10	3672 days	1%
Andrea Tabaka	8/10	3679 days	1%
Tina Rust	8/10	3681 days	1%
Joel Papak	8/10	3683 days	1%
Clemence and Pedro	9/10	3684 days	1%
Doms Wahlelr	9/10	3686 days	1%
Josef Biller	8/10	3686 days	1%
Justine Hoffmann	8/10	3687 days	1%
Friederike East	7/10	3687 days	1%
Mark White	10/10	3688 days	1%
Briony	8/10	3691 days	1%
Gabriel Siibers	8/10	3691 days	1%
Henry Wichler	8/10	3692 days	1%
Kyle Johnson	9/10	3694 days	1%
Niels Wezenberg	7/10	3695 days	1%
John Hamilton	9/10	3695 days	1%
Brianna Burd	9/10	3695 days	1%
Jessica Ruhland	8/10	3696 days	1%
Stula Vladimir	10/10	3697 days	1%
Cosmo Hartuna	7/10	3699 days	1%
Roland Fischer	6/10	3699 days	1%
Ross Holmes	9/10	3700 days	1%
Tilman	9/10	3702 days	1%
Petru	7/10	3703 days	1%
Fero Saarinen	6/10	3704 days	1%
Lauren Thompson	8/10	3706 days	1%
Meilin	8/10	3709 days	1%
Jonas Hoerning	10/10	3713 days	1%
Vanesha Patel	6/10	3714 days	1%
Mauricio Daniele	9/10	3714 days	1%
Sara and Antoine	8/10	3716 days	1%
Clare Pickford	6/10	3716 days	1%
Daniel Hill	10/10	3717 days	1%
Moritz Braun	7/10	3733 days	1%
Grischa Rodust	8/10	3740 days	1%
Chalie Dotesek	9/10	3741 days	1%
Julien Lafeville	7/10	3745 days	1%
Julia Huesam	8/10	3745 days	1%
Alexandre	9/10	3749 days	1%
Kev Zarka	6/10	3750 days	1%
Markus Wabing	8/10	3753 days	1%
Gessica	6/10	3786 days	1%
Simon Quass	9/10	3790 days	1%
Barthelemy	7/10	4019 days	1%
Brita Topp	10/10	4362 days	0%
Laim Thompson	8/10	4362 days	0%
Adriana	10/10	4370 days	0%
Pavel Jarolimek	5/10	4370 days	0%
Leonie Moeller	6/10	4371 days	0%
Doreen Gendel	8/10	4372 days	0%
Carla Oyarzun	3/10	4375 days	0%
Paolo Cases	3/10	4375 days	0%
Wolfgang and Christine	8/10	4380 days	1%
Helen	8/10	4393 days	1%
Olivier Carval	9/10	4395 days	1%
Hirsch Svenja	9/10	4396 days	1%
Mahr Svenja	8/10	4396 days	1%
Anna Guzewiez	9/10	4412 days	1%
Pier Durand	8/10	4416 days	1%
Serena Poggioli	9/10	4416 days	1%
Wayne Schist	7/10	4416 days	1%
Margreth Lydie	5/10	4424 days	1%
Laura Pleumeekers	7/10	4438 days	1%
David Brooks	10/10	4441 days	1%
Adrien Godeloup	9/10	4450 days	1%
Bet Dreno	8/10	4451 days	1%
Joachim	1/10	4452 days	0%
Pioter Jurkowski	7/10	4452 days	1%
Thomas Roche	9/10	4454 days	1%
Brian	9/10	4513 days	1%
hendrik king	9/10	4636 days	1%
Kiki Wykstra	5/10	4746 days	1%
Galen Licht	4/10	4746 days	1%
Yu-Ti Chu	7/10	4749 days	1%
Ton Martens	7/10	4749 days	1%
Joshua Perry	8/10	4754 days	1%
Molly Ladd	8/10	4754 days	1%
Michael Nolan	9/10	4758 days	1%
Julian Roots	9/10	4758 days	1%
Florent Corino	9/10	4762 days	1%
Amiot Cyriane	7/10	4762 days	1%
Annika	7/10	4762 days	1%
Jonas Herrmann	7/10	4762 days	1%
Matthieu Daveou	8/10	4762 days	1%
Julien Panossian	6/10	4762 days	1%
Raoul Montestruer	5/10	4762 days	1%
Alessa Ndra	8/10	4768 days	1%
Bjorn Hedmark	5/10	4769 days	1%
Evyatar Tulipman	7/10	4771 days	1%
S Curry	10/10	4786 days	1%
Ingrid	9/10	4830 days	1%
Reinier Timmer	7/10	4830 days	1%
Moorman	8/10	4839 days	1%
Stefan Roth	9/10	4864 days	1%
David	9/10	4878 days	1%
kevindang	10/10	5031 days	1%
Ruben Kunze	4/10	5113 days	1%
Sebastian Hol	9/10	5119 days	1%
Dick Stewart	8/10	5128 days	1%
David Beaumont	9/10	5135 days	1%
Beyeler	10/10	5140 days	1%
Nikita Sue	9/10	5145 days	1%
Schweiger	10/10	5147 days	1%
Jan & Marian	10/10	5226 days	1%
Konny	9/10	5230 days	1%
Waldemar Schuler	8/10	5230 days	1%
jule	3/10	5244 days	1%
Jack Potman	8/10	5446 days	1%
Jon_and_Family	9/10	5458 days	1%
Walker	9/10	5461 days	1%
Andreas Blessing	10/10	5469 days	1%
Gema	7/10	5472 days	1%
Avry Fabrice	6/10	5477 days	1%
Diane Johnston	9/10	5482 days	1%
Javier Munoz	8/10	5482 days	1%
Ben Akin-Smith	8/10	5483 days	1%
K Wallis	9/10	5488 days	1%
khs	9/10	5489 days	1%
Emma Ducat	9/10	5489 days	1%
Mr and Mrs Lambert	8/10	5496 days	1%
Andrew Koster	7/10	5502 days	1%
Bakker	8/10	5502 days	1%
Kimberly St Louis	8/10	5503 days	1%
Roel Wesstra	8/10	5509 days	1%
Seifert	10/10	5509 days	1%
Derek Woodward	9/10	5511 days	1%
Fabi & Sabi	8/10	5512 days	1%
Rosey834	8/10	5579 days	1%
Pete & Chris	10/10	5779 days	1%
Tony Masters	9/10	5842 days	1%
Hershell	8/10	5846 days	1%
Mike Robinson	9/10	5847 days	1%
Brent S	2/10	5848 days	0%
Zara Leyden	9/10	5856 days	1%
Judith	7/10	5860 days	1%
anon	8/10	5861 days	1%
Pierre Pilon	8/10	5862 days	1%
Jenny Omb	1/10	5867 days	0%
Frei Urs	6/10	5868 days	1%
Bryan Keddie	9/10	5878 days	1%
Leanne Rogan	5/10	5878 days	1%
Joanne Clarke	8/10	5882 days	1%
Wolfgang G	9/10	5888 days	1%
Thomas Signes	7/10	5909 days	1%
menzel	10/10	5927 days	1%
graemeh1	9/10	5928 days	1%
klinger	10/10	5928 days	1%
gereldineb	8/10	5938 days	1%
jennyb	9/10	5942 days	1%
Frank de Voogd	8/10	5948 days	1%
Jean Paul Mesnage	9/10	5954 days	1%
Hansjoerg Ehrmann	5/10	5955 days	1%
Daniel Alonso	9/10	5956 days	1%
Nigel Petrie	9/10	5967 days	1%
Tracy & Peter Cassidy	8/10	5983 days	1%
miniappleses	8/10	6005 days	1%
Josie Boyle	7/10	6116 days	1%
JanneP	9/10	6186 days	1%
Mikey	9/10	6193 days	1%
SablotniD	7/10	6197 days	1%
WiebkeS	9/10	6204 days	1%
Tanya	5/10	6205 days	1%
Jan	6/10	6205 days	1%
Viola	8/10	6207 days	1%
RowanL	7/10	6208 days	1%
VickiEngland	8/10	6216 days	1%
TomC1	8/10	6221 days	1%
AndyK	9/10	6221 days	1%
TatiamT	9/10	6221 days	1%
GillianK	8/10	6223 days	1%
EelcoK	9/10	6223 days	1%
Michael	9/10	6227 days	1%
soccaplaya14	10/10	6227 days	1%
Eugene	7/10	6229 days	1%
John	6/10	6231 days	1%
Tony	8/10	6236 days	1%
Middleton	4/10	6237 days	1%
Elise	8/10	6238 days	1%
Marie	8/10	6238 days	1%
ThomasS1	10/10	6243 days	1%
RasmusB	4/10	6245 days	1%
Simon	8/10	6250 days	1%
Phil&Joe	10/10	6252 days	1%
Marcus	7/10	6252 days	1%
Andre	7/10	6254 days	1%
Iris	9/10	6256 days	1%
Carla	7/10	6256 days	1%
Sandra	8/10	6260 days	1%
Schaffluber	10/10	6261 days	1%
Hayley	5/10	6262 days	1%
Con	2/10	6306 days	0%
felix	7/10	6307 days	1%
melissa	10/10	6313 days	1%
John B	5/10	6316 days	1%
Gemma	7/10	6354 days	1%
Henry	7/10	6355 days	1%
Antonella	10/10	6362 days	1%
Michelle	8/10	6362 days	1%
Laura	7/10	6371 days	1%
Sarah	8/10	6385 days	1%
Katerina	7/10	6406 days	1%
Erin	3/10	6406 days	1%
Mike Knight	9/10	6427 days	1%
Bronagh Mcartan	8/10	6436 days	1%
Dave	8/10	6447 days	1%
fgregory	10/10	6450 days	1%
Rhea	6/10	6496 days	1%
Georgina Mulligan	8/10	6508 days	1%
Karen C	7/10	6519 days	1%
Edmund Hillstone	10/10	6537 days	1%
Toby	6/10	6560 days	1%
Jennifer Baulch	9/10	6564 days	1%
Susan	8/10	6568 days	1%
Hoetnagels	7/10	6571 days	1%
Alan Bellerby	8/10	6574 days	1%
Sanne Jonker	7/10	6575 days	1%
Renske Tehurne	8/10	6579 days	1%
Benjamin Krein	7/10	6579 days	1%
Anne and Derek	8/10	6580 days	1%
James Davies	7/10	6580 days	1%
Naomi Horton	8/10	6581 days	1%
Roger Repolusk	8/10	6585 days	1%
Tony Wicks	6/10	6585 days	1%
Nancy Dol	8/10	6585 days	1%
Kristine	10/10	6585 days	1%
Kathy Hawey	9/10	6587 days	1%
David Buckley	8/10	6588 days	1%
Lena1	6/10	6588 days	1%
John Woodrow	8/10	6589 days	1%
Carmen Dolny	10/10	6589 days	1%
Haemnerli	8/10	6593 days	1%
Carla	8/10	6600 days	1%
Jim Curley	8/10	6600 days	1%
paulonline	7/10	6606 days	1%
Bex	6/10	6615 days	1%
Jenny Hulsebosch	8/10	6616 days	1%
Melissa Steedman	8/10	6627 days	1%
Tim	7/10	6628 days	1%
Falk Seidel	7/10	6631 days	1%
Hans Olthof	8/10	6631 days	1%
Anu	9/10	6634 days	1%
Anneli	6/10	6636 days	1%
purplekat99	10/10	6644 days	1%
Connor	10/10	6657 days	1%
Ad	7/10	6657 days	1%
Ann Westmacott	5/10	6662 days	1%
Paul Cowie	8/10	6663 days	1%
Ewen Maclean	8/10	6663 days	1%
Sarah Wilton	5/10	6663 days	1%
Arend v Dyn	7/10	6665 days	1%
Linda	8/10	6669 days	1%
Fiona	7/10	6669 days	1%
Ann	7/10	6670 days	1%
ranker_584	9/10	6673 days	1%
Christine	7/10	6673 days	1%
Nina	9/10	6673 days	1%
Anthony	7/10	6678 days	1%
Tom Clements	7/10	6678 days	1%
ranker_46	8/10	6790 days	1%
Pat Brewster	8/10	6790 days	1%
FrankOosterwijk	6/10	6875 days	1%
Kim	8/10	6875 days	1%
Helen	7/10	6906 days	1%
Heather	9/10	6906 days	1%
Helene	9/10	6918 days	1%
John	7/10	6918 days	1%
Giancarlo	6/10	6918 days	1%
Annette	4/10	6942 days	1%
John	5/10	6942 days	1%
Duncan	9/10	6947 days	1%
Jen	4/10	6958 days	1%
Rolf	8/10	6966 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

-0.73% 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 36 days. Adjustments are according to the following table.

Days	Adjustment
…	…
33	-0.67%
34	-0.69%
35	-0.71%
36	-0.73%
37	-0.75%
38	-0.77%
39	-0.79%
…	…

Balancing Adjustment

5.38% 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.