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

91.86%

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 22 days 99.92 100%
Amanda Walden 10/10 905 days 10.72 11%
Monique Pos 9/10 995 days 6.58 7%
Alison Egan-Jones 9/10 1025 days 5.78 6%
Sylvain Schiber 9/10 1026 days 5.75 6%
Sylvain Chanton 10/10 1031 days true 5.65 6%
Julian Gury 8/10 1039 days true 5.22 5%
R. Damen 9/10 1056 days 5.24 5%
Michelle Smit 10/10 1117 days 4.97 5%
Gesa Roemer 8/10 1247 days true 4.53 5%
Anais Roux 10/10 1252 days true 4.76 5%
Luca Staudt 8/10 1271 days true 4.5 4%
Florian Bisault 7/10 1272 days true 4.3 4%
Anna Jungclaus 9/10 1279 days true 4.72 5%
Signe Broedbaek 7/10 1281 days true 4.29 4%
Petra Fragner 10/10 1287 days true 4.71 5%
Koehler Ute 10/10 1299 days 4.69 5%
Niclas Ullno 8/10 1302 days true 4.45 4%
Tamara 7/10 1303 days true 4.26 4%
Chloe Guerillot 9/10 1313 days true 4.67 5%
Luisa and Hannes 9/10 1326 days true 4.65 5%
elena salimzhanova 10/10 1330 days 4.64 5%
Jakub Trojanek 8/10 1341 days true 4.39 4%
Malina 10/10 1347 days true 4.62 5%
Emma Keegan 7/10 1605 days 3.84 4%
Emilie Normand 7/10 1676 days true 3.75 4%
Christopher Buch Madsen 8/10 1997 days true 3.45 3%
Phil Bromby 9/10 1999 days true 3.62 4%
Tobias Thull 7/10 2005 days true 3.29 3%
Rita Hochstiasser 8/10 2027 days true 3.4 3%
Nelle Dutilleur 10/10 2048 days true 3.55 4%
Mathias Butterlin 8/10 2048 days true 3.37 3%
Daryl 8/10 2056 days true 3.36 3%
Bert Pubeg 9/10 2122 days 3.44 3%
Alex 8/10 2426 days 2.83 3%
Lucie 9/10 2462 days true 2.92 3%
Henzen 9/10 2466 days true 2.91 3%
Roy Barton 9/10 2729 days true 2.51 3%
Brian Livesey 9/10 2737 days true 2.5 3%
Merlyn 8/10 2745 days true 2.36 2%
Beyeler 10/10 2749 days true 2.48 2%
Ralf Glaser 7/10 2749 days true 2.26 2%
Suzanne van Kol 8/10 2754 days true 2.35 2%
kiwifrenchy 10/10 2761 days 2.46 2%
_mel_ 9/10 2792 days 2.42 2%
C 10/10 2792 days 2.42 2%
Sarah and Soren 10/10 2829 days true 2.36 2%
Erik Folkersen 10/10 2837 days true 2.35 2%
Rudlinger 10/10 2840 days true 2.34 2%
GenH 10/10 3067 days 2.0 2%
R Tearle 10/10 3076 days true 1.98 2%
Franzi & Tobi 10/10 3078 days true 1.98 2%
Nathalie 10/10 3082 days true 1.98 2%
Ven 9/10 3084 days true 1.97 2%
Jerven and Kim 10/10 3091 days true 1.96 2%
Sarah Luijckx 1/10 3093 days true 1.43 1%
Alan Jeffery 7/10 3094 days true 1.78 2%
Birgette Weiner 9/10 3112 days true 1.93 2%
Tim Van Nispen 9/10 3114 days true 1.93 2%
Bottcher 10/10 3114 days true 1.93 2%
Sue & Graham Mullin 10/10 3121 days true 1.92 2%
John Simpson 9/10 3123 days true 1.91 2%
Karen Phillips 9/10 3123 days true 1.91 2%
Michelle Booty 8/10 3125 days true 1.81 2%
Nadia Husain 7/10 3126 days true 1.74 2%
Dietmar Gans 10/10 3432 days 1.44 1%
Matt Roper 10/10 3454 days true 1.41 1%
Chris Glasg 10/10 3471 days true 1.38 1%
Jamie Hallifax 9/10 3482 days true 1.37 1%
Paul Ritchie 10/10 3486 days true 1.36 1%
Gerry Donoghue 10/10 3505 days true 1.33 1%
Yvonne German 9/10 3508 days true 1.33 1%
DebbieM 5/10 3522 days 1.06 1%
mj111 10/10 3522 days 1.31 1%
Susann Koschmeider 10/10 3557 days true 1.25 1%
X Otte 10/10 3561 days true 1.25 1%
Hans Hoff 10/10 3561 days true 1.25 1%
Solveig Mosinski 10/10 3565 days true 1.24 1%
Val and Barnie Weir 10/10 3576 days true 1.22 1%
Wim Put 9/10 3579 days true 1.22 1%
discerner 10/10 3583 days 1.21 1%
Phillip Reade 10/10 3583 days 1.21 1%
Tim Beuzeval 9/10 3583 days true 1.21 1%
barp 9/10 3614 days true 1.17 1%
Becky Fairweather 10/10 3767 days 0.93 1%
David 10/10 3797 days 0.89 1%
martinat 10/10 3797 days true 0.89 1%
Mike 9/10 3806 days true 0.87 1%
MichaelS1 9/10 3813 days true 0.86 1%
StefanieGermany 9/10 3814 days true 0.86 1%
Veronika 9/10 3816 days true 0.86 1%
Ralph Boese 7/10 3817 days true 0.78 1%
ToyalFrance 9/10 3817 days true 0.86 1%
ReneeA 9/10 3845 days true 0.81 1%
Lorna 8/10 3846 days true 0.77 1%
Bruce 10/10 3847 days true 0.81 1%
Sandra 10/10 3854 days true 0.8 1%
Heidi 7/10 3861 days true 0.72 1%
Philipp 9/10 3861 days true 0.79 1%
Simon 9/10 3863 days true 0.79 1%
Kathryn 8/10 3864 days true 0.75 1%
Barbara 9/10 3869 days true 0.78 1%
Joachim 10/10 3869 days true 0.78 1%
Ans 7/10 3870 days true 0.71 1%
Minder 10/10 3871 days true 0.77 1%
Evi 7/10 3902 days true 0.66 1%
Ann Maree 9/10 3905 days 0.72 1%
Trine 9/10 3915 days true 0.71 1%
Carina Korn 10/10 4012 days true 0.56 1%
Christian 7/10 4012 days true 0.51 1%
Nick 10/10 4015 days true 0.56 1%
Terri Scott 7/10 4032 days true 0.48 0%
Alan Bellerby 10/10 4183 days true 0.3 0%
Robert 4/10 4189 days true 0.23 0%
Elise 10/10 4189 days true 0.29 0%
Fung 8/10 4189 days true 0.28 0%
Peter Aston 9/10 4189 days true 0.29 0%
Tony Wicks 8/10 4194 days true 0.27 0%
Sue 8/10 4201 days true 0.26 0%
Carla 9/10 4209 days true 0.26 0%
Melissa Steedman 9/10 4236 days true 0.22 0%
Vanessa Brennan 7/10 4236 days true 0.2 0%
Tim 9/10 4237 days true 0.22 0%
Mary 10/10 4287 days true 0.14 0%
Agnes 9/10 4503 days true 0.0 0%
Cohen 9/10 4523 days true 0.0 0%
John 8/10 4527 days true 0.0 0%
SueLinsk 9/10 4527 days true 0.0 0%
Frauke 7/10 4569 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

-0.24% 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 12 days. Adjustments are according to the following table.

Days Adjustment
9 -0.18%
10 -0.20%
11 -0.22%
12 -0.24%
13 -0.26%
14 -0.28%
15 -0.30%

Final Ranking Score

92%

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.