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

92.26%

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 10/10 131 days 97.28 100%
Amanda Walden 10/10 1014 days 6.04 6%
Monique Pos 9/10 1104 days 4.98 5%
Alison Egan-Jones 9/10 1134 days 4.92 5%
Sylvain Schiber 9/10 1135 days 4.92 5%
Sylvain Chanton 10/10 1140 days true 4.91 5%
Julian Gury 8/10 1148 days true 4.65 5%
R. Damen 9/10 1165 days 4.86 5%
Michelle Smit 10/10 1226 days 4.74 5%
Gesa Roemer 8/10 1356 days true 4.26 4%
Anais Roux 10/10 1361 days true 4.48 5%
Luca Staudt 8/10 1380 days true 4.22 4%
Florian Bisault 7/10 1381 days true 4.04 4%
Anna Jungclaus 9/10 1388 days true 4.43 5%
Signe Broedbaek 7/10 1390 days true 4.02 4%
Petra Fragner 10/10 1396 days true 4.41 5%
Koehler Ute 10/10 1408 days 4.39 5%
Niclas Ullno 8/10 1411 days true 4.16 4%
Tamara 7/10 1412 days true 3.99 4%
Chloe Guerillot 9/10 1422 days true 4.36 4%
Luisa and Hannes 9/10 1435 days true 4.33 4%
elena salimzhanova 10/10 1439 days 4.33 4%
Jakub Trojanek 8/10 1450 days true 4.09 4%
Malina 10/10 1456 days true 4.29 4%
Emma Keegan 7/10 1714 days 3.45 4%
Emilie Normand 7/10 1785 days true 3.32 3%
Christopher Buch Madsen 8/10 2106 days true 2.87 3%
Phil Bromby 9/10 2108 days true 3.02 3%
Tobias Thull 7/10 2114 days true 2.74 3%
Rita Hochstiasser 8/10 2136 days true 2.81 3%
Nelle Dutilleur 10/10 2157 days true 2.92 3%
Mathias Butterlin 8/10 2157 days true 2.78 3%
Daryl 8/10 2165 days true 2.76 3%
Bert Pubeg 9/10 2231 days 2.78 3%
Alex 8/10 2535 days 2.07 2%
Lucie 9/10 2571 days true 2.11 2%
Henzen 9/10 2575 days true 2.1 2%
Roy Barton 9/10 2838 days true 1.59 2%
Brian Livesey 9/10 2846 days true 1.57 2%
Merlyn 8/10 2854 days true 1.48 2%
Beyeler 10/10 2858 days true 1.55 2%
Ralf Glaser 7/10 2858 days true 1.41 1%
Suzanne van Kol 8/10 2863 days true 1.46 2%
kiwifrenchy 10/10 2870 days 1.53 2%
_mel_ 9/10 2901 days 1.47 2%
C 10/10 2901 days 1.47 2%
Sarah and Soren 10/10 2938 days true 1.39 1%
Erik Folkersen 10/10 2946 days true 1.38 1%
Rudlinger 10/10 2949 days true 1.37 1%
GenH 10/10 3176 days 0.93 1%
R Tearle 10/10 3185 days true 0.91 1%
Franzi & Tobi 10/10 3187 days true 0.91 1%
Nathalie 10/10 3191 days true 0.9 1%
Ven 9/10 3193 days true 0.89 1%
Jerven and Kim 10/10 3200 days true 0.88 1%
Sarah Luijckx 1/10 3202 days true 0.64 1%
Alan Jeffery 7/10 3203 days true 0.8 1%
Birgette Weiner 9/10 3221 days true 0.84 1%
Tim Van Nispen 9/10 3223 days true 0.84 1%
Bottcher 10/10 3223 days true 0.84 1%
Sue & Graham Mullin 10/10 3230 days true 0.82 1%
John Simpson 9/10 3232 days true 0.82 1%
Karen Phillips 9/10 3232 days true 0.82 1%
Michelle Booty 8/10 3234 days true 0.77 1%
Nadia Husain 7/10 3235 days true 0.74 1%
Dietmar Gans 10/10 3541 days 0.21 0%
Matt Roper 10/10 3563 days true 0.17 0%
Chris Glasg 10/10 3580 days true 0.14 0%
Jamie Hallifax 9/10 3591 days true 0.12 0%
Paul Ritchie 10/10 3595 days true 0.11 0%
Gerry Donoghue 10/10 3614 days true 0.07 0%
Yvonne German 9/10 3617 days true 0.06 0%
DebbieM 5/10 3631 days 0.03 0%
mj111 10/10 3631 days 0.04 0%
Susann Koschmeider 10/10 3666 days true 0.0 0%
X Otte 10/10 3670 days true 0.0 0%
Hans Hoff 10/10 3670 days true 0.0 0%
Solveig Mosinski 10/10 3674 days true 0.0 0%
Val and Barnie Weir 10/10 3685 days true 0.0 0%
Wim Put 9/10 3688 days true 0.0 0%
discerner 10/10 3692 days 0.0 0%
Phillip Reade 10/10 3692 days 0.0 0%
Tim Beuzeval 9/10 3692 days true 0.0 0%
barp 9/10 3723 days true 0.0 0%
Becky Fairweather 10/10 3876 days 0.0 0%
David 10/10 3906 days 0.0 0%
martinat 10/10 3906 days true 0.0 0%
Mike 9/10 3915 days true 0.0 0%
MichaelS1 9/10 3922 days true 0.0 0%
StefanieGermany 9/10 3923 days true 0.0 0%
Veronika 9/10 3925 days true 0.0 0%
Ralph Boese 7/10 3926 days true 0.0 0%
ToyalFrance 9/10 3926 days true 0.0 0%
ReneeA 9/10 3954 days true 0.0 0%
Lorna 8/10 3955 days true 0.0 0%
Bruce 10/10 3956 days true 0.0 0%
Sandra 10/10 3963 days true 0.0 0%
Heidi 7/10 3970 days true 0.0 0%
Philipp 9/10 3970 days true 0.0 0%
Simon 9/10 3972 days true 0.0 0%
Kathryn 8/10 3973 days true 0.0 0%
Barbara 9/10 3978 days true 0.0 0%
Joachim 10/10 3978 days true 0.0 0%
Ans 7/10 3979 days true 0.0 0%
Minder 10/10 3980 days true 0.0 0%
Evi 7/10 4011 days true 0.0 0%
Ann Maree 9/10 4014 days 0.0 0%
Trine 9/10 4024 days true 0.0 0%
Carina Korn 10/10 4121 days true 0.0 0%
Christian 7/10 4121 days true 0.0 0%
Nick 10/10 4124 days true 0.0 0%
Terri Scott 7/10 4141 days true 0.0 0%
Alan Bellerby 10/10 4292 days true 0.0 0%
Robert 4/10 4298 days true 0.0 0%
Elise 10/10 4298 days true 0.0 0%
Fung 8/10 4298 days true 0.0 0%
Peter Aston 9/10 4298 days true 0.0 0%
Tony Wicks 8/10 4303 days true 0.0 0%
Sue 8/10 4310 days true 0.0 0%
Carla 9/10 4318 days true 0.0 0%
Melissa Steedman 9/10 4345 days true 0.0 0%
Vanessa Brennan 7/10 4345 days true 0.0 0%
Tim 9/10 4346 days true 0.0 0%
Mary 10/10 4396 days true 0.0 0%
Agnes 9/10 4612 days true 0.0 0%
Cohen 9/10 4632 days true 0.0 0%
John 8/10 4636 days true 0.0 0%
SueLinsk 9/10 4636 days true 0.0 0%
Frauke 7/10 4678 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

-2.42% 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 121 days. Adjustments are according to the following table.

Days Adjustment
118 -2.36%
119 -2.38%
120 -2.40%
121 -2.42%
122 -2.44%
123 -2.46%
124 -2.48%

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.