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

92.13%

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 77 days 99.06 100%
Amanda Walden 10/10 960 days 7.89 8%
Monique Pos 9/10 1050 days 5.32 5%
Alison Egan-Jones 9/10 1080 days 5.04 5%
Sylvain Schiber 9/10 1080 days 5.04 5%
Sylvain Chanton 10/10 1085 days true 5.02 5%
Julian Gury 8/10 1093 days true 4.75 5%
R. Damen 9/10 1111 days 4.97 5%
Michelle Smit 10/10 1172 days 4.87 5%
Gesa Roemer 8/10 1301 days true 4.41 4%
Anais Roux 10/10 1306 days true 4.64 5%
Luca Staudt 8/10 1325 days true 4.38 4%
Florian Bisault 7/10 1326 days true 4.19 4%
Anna Jungclaus 9/10 1333 days true 4.59 5%
Signe Broedbaek 7/10 1335 days true 4.18 4%
Petra Fragner 10/10 1341 days true 4.58 5%
Koehler Ute 10/10 1354 days 4.56 5%
Niclas Ullno 8/10 1356 days true 4.33 4%
Tamara 7/10 1357 days true 4.14 4%
Chloe Guerillot 9/10 1367 days true 4.53 5%
Luisa and Hannes 9/10 1380 days true 4.51 5%
elena salimzhanova 10/10 1385 days 4.5 5%
Jakub Trojanek 8/10 1395 days true 4.26 4%
Malina 10/10 1401 days true 4.48 5%
Emma Keegan 7/10 1660 days 3.67 4%
Emilie Normand 7/10 1730 days true 3.56 4%
Christopher Buch Madsen 8/10 2051 days true 3.19 3%
Phil Bromby 9/10 2053 days true 3.36 3%
Tobias Thull 7/10 2059 days true 3.05 3%
Rita Hochstiasser 8/10 2081 days true 3.15 3%
Nelle Dutilleur 10/10 2102 days true 3.28 3%
Mathias Butterlin 8/10 2102 days true 3.11 3%
Daryl 8/10 2110 days true 3.1 3%
Bert Pubeg 9/10 2176 days 3.15 3%
Alex 8/10 2480 days 2.5 3%
Lucie 9/10 2516 days true 2.57 3%
Henzen 9/10 2520 days true 2.56 3%
Roy Barton 9/10 2783 days true 2.11 2%
Brian Livesey 9/10 2791 days true 2.1 2%
Merlyn 8/10 2799 days true 1.98 2%
Beyeler 10/10 2803 days true 2.08 2%
Ralf Glaser 7/10 2803 days true 1.89 2%
Suzanne van Kol 8/10 2808 days true 1.96 2%
kiwifrenchy 10/10 2815 days 2.05 2%
_mel_ 9/10 2846 days 2.0 2%
C 10/10 2846 days 2.0 2%
Sarah and Soren 10/10 2883 days true 1.94 2%
Erik Folkersen 10/10 2891 days true 1.92 2%
Rudlinger 10/10 2894 days true 1.92 2%
GenH 10/10 3121 days 1.53 2%
R Tearle 10/10 3130 days true 1.52 2%
Franzi & Tobi 10/10 3132 days true 1.51 2%
Nathalie 10/10 3136 days true 1.51 2%
Ven 9/10 3138 days true 1.5 2%
Jerven and Kim 10/10 3145 days true 1.49 2%
Sarah Luijckx 1/10 3147 days true 1.09 1%
Alan Jeffery 7/10 3148 days true 1.35 1%
Birgette Weiner 9/10 3166 days true 1.45 1%
Tim Van Nispen 9/10 3168 days true 1.45 1%
Bottcher 10/10 3168 days true 1.45 1%
Sue & Graham Mullin 10/10 3175 days true 1.44 1%
John Simpson 9/10 3177 days true 1.43 1%
Karen Phillips 9/10 3177 days true 1.43 1%
Michelle Booty 8/10 3179 days true 1.36 1%
Nadia Husain 7/10 3180 days true 1.3 1%
Dietmar Gans 10/10 3486 days 0.91 1%
Matt Roper 10/10 3508 days true 0.87 1%
Chris Glasg 10/10 3525 days true 0.84 1%
Jamie Hallifax 9/10 3536 days true 0.82 1%
Paul Ritchie 10/10 3540 days true 0.81 1%
Gerry Donoghue 10/10 3559 days true 0.78 1%
Yvonne German 9/10 3562 days true 0.78 1%
DebbieM 5/10 3576 days 0.61 1%
mj111 10/10 3576 days 0.75 1%
Susann Koschmeider 10/10 3611 days true 0.69 1%
X Otte 10/10 3615 days true 0.68 1%
Hans Hoff 10/10 3615 days true 0.68 1%
Solveig Mosinski 10/10 3619 days true 0.68 1%
Val and Barnie Weir 10/10 3630 days true 0.66 1%
Wim Put 9/10 3633 days true 0.65 1%
discerner 10/10 3637 days 0.65 1%
Phillip Reade 10/10 3637 days 0.65 1%
Tim Beuzeval 9/10 3637 days true 0.65 1%
barp 9/10 3668 days true 0.59 1%
Becky Fairweather 10/10 3821 days 0.33 0%
David 10/10 3851 days 0.28 0%
martinat 10/10 3851 days true 0.28 0%
Mike 9/10 3861 days true 0.26 0%
MichaelS1 9/10 3867 days true 0.25 0%
StefanieGermany 9/10 3869 days true 0.25 0%
Veronika 9/10 3871 days true 0.25 0%
Ralph Boese 7/10 3871 days true 0.22 0%
ToyalFrance 9/10 3871 days true 0.25 0%
ReneeA 9/10 3899 days true 0.2 0%
Lorna 8/10 3901 days true 0.19 0%
Bruce 10/10 3902 days true 0.19 0%
Sandra 10/10 3909 days true 0.18 0%
Heidi 7/10 3916 days true 0.15 0%
Philipp 9/10 3916 days true 0.17 0%
Simon 9/10 3918 days true 0.17 0%
Kathryn 8/10 3919 days true 0.16 0%
Barbara 9/10 3924 days true 0.16 0%
Joachim 10/10 3924 days true 0.16 0%
Ans 7/10 3925 days true 0.14 0%
Minder 10/10 3926 days true 0.15 0%
Evi 7/10 3957 days true 0.09 0%
Ann Maree 9/10 3960 days 0.09 0%
Trine 9/10 3970 days true 0.08 0%
Carina Korn 10/10 4067 days true 0.0 0%
Christian 7/10 4067 days true 0.0 0%
Nick 10/10 4070 days true 0.0 0%
Terri Scott 7/10 4087 days true 0.0 0%
Alan Bellerby 10/10 4237 days true 0.0 0%
Robert 4/10 4243 days true 0.0 0%
Elise 10/10 4243 days true 0.0 0%
Fung 8/10 4243 days true 0.0 0%
Peter Aston 9/10 4243 days true 0.0 0%
Tony Wicks 8/10 4248 days true 0.0 0%
Sue 8/10 4255 days true 0.0 0%
Carla 9/10 4263 days true 0.0 0%
Melissa Steedman 9/10 4290 days true 0.0 0%
Vanessa Brennan 7/10 4290 days true 0.0 0%
Tim 9/10 4291 days true 0.0 0%
Mary 10/10 4341 days true 0.0 0%
Agnes 9/10 4557 days true 0.0 0%
Cohen 9/10 4577 days true 0.0 0%
John 8/10 4581 days true 0.0 0%
SueLinsk 9/10 4581 days true 0.0 0%
Frauke 7/10 4623 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

-1.34% Adjustment

There may be an adjustment if an experience hasn't received any reviews within the last 60 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 199 days.

The White Island Tours experience has been adjusted for 67 days. Adjustments are according to the following table.

Days Adjustment
64 -1.28%
65 -1.30%
66 -1.32%
67 -1.34%
68 -1.36%
69 -1.38%
70 -1.40%

Final Ranking Score

91%

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.