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 White Island Tours.

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

White Island Tours

Valid Reviews

129 Valid Reviews

The White Island Tours experience has a total of 129 valid reviews. There are no 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 129 valid reviews:

Rating Count Percentage
10/10 48
37%
9/10 42
33%
8/10 19
15%
7/10 17
13%
6/10 0
0%
5/10 1
1%
4/10 1
1%
3/10 0
0%
2/10 0
0%
1/10 1
1%

88.29% Average

The raw data average (mean) for all the White Island Tours valid reviews is 88.29% and is based on 129 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

105 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 129 valid reviews, the experience has 105 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 105 face-to-face reviews:

Rating Count Percentage
10/10 34
32%
9/10 35
33%
8/10 18
17%
7/10 16
15%
6/10 0
0%
5/10 0
0%
4/10 1
1%
3/10 0
0%
2/10 0
0%
1/10 1
1%

87.24% Average

The raw data average (mean) for all the White Island Tours face-to-face reviews is 87.24% and is based on 105 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.

Weighted Average

92.20%

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 Face-to-Face Weight Relative Weight
Matthew Mutimer 10/10 310 days 84.77 100%
Amanda Walden 10/10 1193 days 4.81 6%
Monique Pos 9/10 1283 days 4.63 5%
Alison Egan-Jones 9/10 1313 days 4.57 5%
Sylvain Schiber 9/10 1313 days 4.57 5%
Sylvain Chanton 10/10 1318 days true 4.56 5%
Julian Gury 8/10 1326 days true 4.32 5%
R. Damen 9/10 1344 days 4.51 5%
Michelle Smit 10/10 1405 days 4.39 5%
Gesa Roemer 8/10 1534 days true 3.93 5%
Anais Roux 10/10 1539 days true 4.13 5%
Luca Staudt 8/10 1558 days true 3.89 5%
Florian Bisault 7/10 1559 days true 3.72 4%
Anna Jungclaus 9/10 1566 days true 4.08 5%
Signe Broedbaek 7/10 1568 days true 3.71 4%
Petra Fragner 10/10 1574 days true 4.06 5%
Koehler Ute 10/10 1587 days 4.04 5%
Niclas Ullno 8/10 1589 days true 3.83 5%
Tamara 7/10 1590 days true 3.67 4%
Chloe Guerillot 9/10 1600 days true 4.01 5%
Luisa and Hannes 9/10 1613 days true 3.99 5%
elena salimzhanova 10/10 1618 days 3.98 5%
Jakub Trojanek 8/10 1628 days true 3.76 4%
Malina 10/10 1634 days true 3.95 5%
Emma Keegan 7/10 1893 days 3.13 4%
Emilie Normand 7/10 1963 days true 3.0 4%
Christopher Buch Madsen 8/10 2284 days true 2.54 3%
Phil Bromby 9/10 2286 days true 2.67 3%
Tobias Thull 7/10 2292 days true 2.42 3%
Rita Hochstiasser 8/10 2314 days true 2.48 3%
Nelle Dutilleur 10/10 2335 days true 2.57 3%
Mathias Butterlin 8/10 2335 days true 2.44 3%
Daryl 8/10 2343 days true 2.43 3%
Bert Pubeg 9/10 2409 days 2.43 3%
Alex 8/10 2713 days 1.74 2%
Lucie 9/10 2749 days true 1.76 2%
Henzen 9/10 2753 days true 1.76 2%
Roy Barton 9/10 3016 days true 1.24 1%
Brian Livesey 9/10 3024 days true 1.23 1%
Merlyn 8/10 3032 days true 1.15 1%
Beyeler 10/10 3036 days true 1.2 1%
Ralf Glaser 7/10 3036 days true 1.09 1%
Suzanne van Kol 8/10 3041 days true 1.13 1%
kiwifrenchy 10/10 3048 days 1.18 1%
_mel_ 9/10 3079 days 1.12 1%
C 10/10 3079 days 1.12 1%
Sarah and Soren 10/10 3116 days true 1.05 1%
Erik Folkersen 10/10 3124 days true 1.03 1%
Rudlinger 10/10 3127 days true 1.02 1%
GenH 10/10 3354 days 0.58 1%
R Tearle 10/10 3363 days true 0.56 1%
Franzi & Tobi 10/10 3365 days true 0.56 1%
Nathalie 10/10 3369 days true 0.55 1%
Ven 9/10 3371 days true 0.55 1%
Jerven and Kim 10/10 3378 days true 0.53 1%
Sarah Luijckx 1/10 3380 days true 0.39 0%
Alan Jeffery 7/10 3381 days true 0.48 1%
Birgette Weiner 9/10 3399 days true 0.49 1%
Tim Van Nispen 9/10 3401 days true 0.49 1%
Bottcher 10/10 3401 days true 0.49 1%
Sue & Graham Mullin 10/10 3408 days true 0.47 1%
John Simpson 9/10 3410 days true 0.47 1%
Karen Phillips 9/10 3410 days true 0.47 1%
Michelle Booty 8/10 3412 days true 0.44 1%
Nadia Husain 7/10 3413 days true 0.42 0%
Dietmar Gans 10/10 3719 days 0.0 0%
Matt Roper 10/10 3741 days true 0.0 0%
Chris Glasg 10/10 3758 days true 0.0 0%
Jamie Hallifax 9/10 3769 days true 0.0 0%
Paul Ritchie 10/10 3773 days true 0.0 0%
Gerry Donoghue 10/10 3792 days true 0.0 0%
Yvonne German 9/10 3795 days true 0.0 0%
DebbieM 5/10 3809 days 0.0 0%
mj111 10/10 3809 days 0.0 0%
Susann Koschmeider 10/10 3844 days true 0.0 0%
X Otte 10/10 3848 days true 0.0 0%
Hans Hoff 10/10 3848 days true 0.0 0%
Solveig Mosinski 10/10 3852 days true 0.0 0%
Val and Barnie Weir 10/10 3863 days true 0.0 0%
Wim Put 9/10 3866 days true 0.0 0%
discerner 10/10 3870 days 0.0 0%
Phillip Reade 10/10 3870 days 0.0 0%
Tim Beuzeval 9/10 3870 days true 0.0 0%
barp 9/10 3901 days true 0.0 0%
Becky Fairweather 10/10 4054 days 0.0 0%
David 10/10 4084 days 0.0 0%
martinat 10/10 4084 days true 0.0 0%
Mike 9/10 4094 days true 0.0 0%
MichaelS1 9/10 4100 days true 0.0 0%
StefanieGermany 9/10 4102 days true 0.0 0%
Veronika 9/10 4104 days true 0.0 0%
Ralph Boese 7/10 4104 days true 0.0 0%
ToyalFrance 9/10 4104 days true 0.0 0%
ReneeA 9/10 4132 days true 0.0 0%
Lorna 8/10 4134 days true 0.0 0%
Bruce 10/10 4135 days true 0.0 0%
Sandra 10/10 4141 days true 0.0 0%
Heidi 7/10 4149 days true 0.0 0%
Philipp 9/10 4149 days true 0.0 0%
Simon 9/10 4150 days true 0.0 0%
Kathryn 8/10 4151 days true 0.0 0%
Barbara 9/10 4156 days true 0.0 0%
Joachim 10/10 4157 days true 0.0 0%
Ans 7/10 4157 days true 0.0 0%
Minder 10/10 4159 days true 0.0 0%
Evi 7/10 4190 days true 0.0 0%
Ann Maree 9/10 4193 days 0.0 0%
Trine 9/10 4203 days true 0.0 0%
Carina Korn 10/10 4300 days true 0.0 0%
Christian 7/10 4300 days true 0.0 0%
Nick 10/10 4303 days true 0.0 0%
Terri Scott 7/10 4320 days true 0.0 0%
Alan Bellerby 10/10 4470 days true 0.0 0%
Robert 4/10 4476 days true 0.0 0%
Elise 10/10 4476 days true 0.0 0%
Fung 8/10 4476 days true 0.0 0%
Peter Aston 9/10 4476 days true 0.0 0%
Tony Wicks 8/10 4481 days true 0.0 0%
Sue 8/10 4488 days true 0.0 0%
Carla 9/10 4496 days true 0.0 0%
Melissa Steedman 9/10 4523 days true 0.0 0%
Vanessa Brennan 7/10 4523 days true 0.0 0%
Tim 9/10 4524 days true 0.0 0%
Mary 10/10 4574 days true 0.0 0%
Agnes 9/10 4790 days true 0.0 0%
Cohen 9/10 4810 days true 0.0 0%
John 8/10 4814 days true 0.0 0%
SueLinsk 9/10 4814 days true 0.0 0%
Frauke 7/10 4856 days true 0.0 0%

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 White Island Tours experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-2.34% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 110 days. However the White Island Tours 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 White Island Tours experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -2.31%
198 -2.32%
199 -2.33%
200 -2.34%
201 -2.36%
202 -2.37%
203 -2.38%

Final Ranking Score

90%

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.