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

91.76%

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 10/10 487 days 62.42 100%
Amanda Walden 10/10 1370 days 4.46 7%
Monique Pos 9/10 1460 days 4.29 7%
Alison Egan-Jones 9/10 1490 days 4.23 7%
Sylvain Schiber 9/10 1491 days 4.23 7%
Sylvain Chanton 10/10 1496 days true 4.22 7%
Julian Gury 8/10 1504 days true 3.99 6%
R. Damen 9/10 1521 days 4.17 7%
Michelle Smit 10/10 1582 days 4.05 6%
Gesa Roemer 8/10 1712 days true 3.6 6%
Anais Roux 10/10 1717 days true 3.78 6%
Luca Staudt 8/10 1736 days true 3.56 6%
Florian Bisault 7/10 1737 days true 3.41 5%
Anna Jungclaus 9/10 1744 days true 3.73 6%
Signe Broedbaek 7/10 1746 days true 3.39 5%
Petra Fragner 10/10 1752 days true 3.71 6%
Koehler Ute 10/10 1764 days 3.69 6%
Niclas Ullno 8/10 1767 days true 3.5 6%
Tamara 7/10 1768 days true 3.35 5%
Chloe Guerillot 9/10 1778 days true 3.66 6%
Luisa and Hannes 9/10 1791 days true 3.64 6%
elena salimzhanova 10/10 1795 days 3.63 6%
Jakub Trojanek 8/10 1806 days true 3.43 5%
Malina 10/10 1812 days true 3.6 6%
Emma Keegan 7/10 2070 days 2.81 5%
Emilie Normand 7/10 2141 days true 2.69 4%
Christopher Buch Madsen 8/10 2462 days true 2.21 4%
Phil Bromby 9/10 2464 days true 2.32 4%
Tobias Thull 7/10 2470 days true 2.1 3%
Rita Hochstiasser 8/10 2492 days true 2.15 3%
Nelle Dutilleur 10/10 2513 days true 2.23 4%
Mathias Butterlin 8/10 2513 days true 2.11 3%
Daryl 8/10 2521 days true 2.1 3%
Bert Pubeg 9/10 2587 days 2.08 3%
Alex 8/10 2891 days 1.41 2%
Lucie 9/10 2927 days true 1.41 2%
Henzen 9/10 2931 days true 1.41 2%
Roy Barton 9/10 3194 days true 0.89 1%
Brian Livesey 9/10 3202 days true 0.88 1%
Merlyn 8/10 3210 days true 0.82 1%
Beyeler 10/10 3214 days true 0.85 1%
Ralf Glaser 7/10 3214 days true 0.78 1%
Suzanne van Kol 8/10 3219 days true 0.8 1%
kiwifrenchy 10/10 3226 days 0.83 1%
_mel_ 9/10 3257 days 0.77 1%
C 10/10 3257 days 0.77 1%
Sarah and Soren 10/10 3294 days true 0.7 1%
Erik Folkersen 10/10 3302 days true 0.68 1%
Rudlinger 10/10 3305 days true 0.68 1%
GenH 10/10 3532 days 0.23 0%
R Tearle 10/10 3541 days true 0.21 0%
Franzi & Tobi 10/10 3543 days true 0.21 0%
Nathalie 10/10 3547 days true 0.2 0%
Ven 9/10 3549 days true 0.2 0%
Jerven and Kim 10/10 3556 days true 0.18 0%
Sarah Luijckx 1/10 3558 days true 0.13 0%
Alan Jeffery 7/10 3559 days true 0.16 0%
Birgette Weiner 9/10 3577 days true 0.14 0%
Tim Van Nispen 9/10 3579 days true 0.14 0%
Bottcher 10/10 3579 days true 0.14 0%
Sue & Graham Mullin 10/10 3586 days true 0.13 0%
John Simpson 9/10 3588 days true 0.12 0%
Karen Phillips 9/10 3588 days true 0.12 0%
Michelle Booty 8/10 3590 days true 0.11 0%
Nadia Husain 7/10 3591 days true 0.11 0%
Dietmar Gans 10/10 3897 days 0.0 0%
Matt Roper 10/10 3919 days true 0.0 0%
Chris Glasg 10/10 3936 days true 0.0 0%
Jamie Hallifax 9/10 3947 days true 0.0 0%
Paul Ritchie 10/10 3951 days true 0.0 0%
Gerry Donoghue 10/10 3970 days true 0.0 0%
Yvonne German 9/10 3973 days true 0.0 0%
DebbieM 5/10 3987 days 0.0 0%
mj111 10/10 3987 days 0.0 0%
Susann Koschmeider 10/10 4022 days true 0.0 0%
X Otte 10/10 4026 days true 0.0 0%
Hans Hoff 10/10 4026 days true 0.0 0%
Solveig Mosinski 10/10 4030 days true 0.0 0%
Val and Barnie Weir 10/10 4041 days true 0.0 0%
Wim Put 9/10 4044 days true 0.0 0%
discerner 10/10 4048 days 0.0 0%
Phillip Reade 10/10 4048 days 0.0 0%
Tim Beuzeval 9/10 4048 days true 0.0 0%
barp 9/10 4079 days true 0.0 0%
Becky Fairweather 10/10 4232 days 0.0 0%
David 10/10 4262 days 0.0 0%
martinat 10/10 4262 days true 0.0 0%
Mike 9/10 4271 days true 0.0 0%
MichaelS1 9/10 4278 days true 0.0 0%
StefanieGermany 9/10 4279 days true 0.0 0%
Veronika 9/10 4281 days true 0.0 0%
Ralph Boese 7/10 4282 days true 0.0 0%
ToyalFrance 9/10 4282 days true 0.0 0%
ReneeA 9/10 4310 days true 0.0 0%
Lorna 8/10 4311 days true 0.0 0%
Bruce 10/10 4312 days true 0.0 0%
Sandra 10/10 4319 days true 0.0 0%
Heidi 7/10 4326 days true 0.0 0%
Philipp 9/10 4326 days true 0.0 0%
Simon 9/10 4328 days true 0.0 0%
Kathryn 8/10 4329 days true 0.0 0%
Barbara 9/10 4334 days true 0.0 0%
Joachim 10/10 4334 days true 0.0 0%
Ans 7/10 4335 days true 0.0 0%
Minder 10/10 4336 days true 0.0 0%
Evi 7/10 4367 days true 0.0 0%
Ann Maree 9/10 4370 days 0.0 0%
Trine 9/10 4380 days true 0.0 0%
Carina Korn 10/10 4477 days true 0.0 0%
Christian 7/10 4477 days true 0.0 0%
Nick 10/10 4480 days true 0.0 0%
Terri Scott 7/10 4497 days true 0.0 0%
Alan Bellerby 10/10 4648 days true 0.0 0%
Robert 4/10 4654 days true 0.0 0%
Elise 10/10 4654 days true 0.0 0%
Fung 8/10 4654 days true 0.0 0%
Peter Aston 9/10 4654 days true 0.0 0%
Tony Wicks 8/10 4659 days true 0.0 0%
Sue 8/10 4666 days true 0.0 0%
Carla 9/10 4674 days true 0.0 0%
Melissa Steedman 9/10 4701 days true 0.0 0%
Vanessa Brennan 7/10 4701 days true 0.0 0%
Tim 9/10 4702 days true 0.0 0%
Mary 10/10 4752 days true 0.0 0%
Agnes 9/10 4968 days true 0.0 0%
Cohen 9/10 4988 days true 0.0 0%
John 8/10 4992 days true 0.0 0%
SueLinsk 9/10 4992 days true 0.0 0%
Frauke 7/10 5034 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

-4.07% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 43 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 -4.01%
198 -4.03%
199 -4.05%
200 -4.07%
201 -4.09%
202 -4.11%
203 -4.13%

Final Ranking Score

88%

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.