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

92.24%

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 10/10 250 days 90.1 100%
Amanda Walden 10/10 1133 days 4.93 5%
Monique Pos 9/10 1223 days 4.75 5%
Alison Egan-Jones 9/10 1253 days 4.69 5%
Sylvain Schiber 9/10 1254 days 4.69 5%
Sylvain Chanton 10/10 1259 days true 4.68 5%
Julian Gury 8/10 1267 days true 4.43 5%
R. Damen 9/10 1284 days 4.63 5%
Michelle Smit 10/10 1345 days 4.51 5%
Gesa Roemer 8/10 1475 days true 4.04 4%
Anais Roux 10/10 1480 days true 4.25 5%
Luca Staudt 8/10 1499 days true 4.0 4%
Florian Bisault 7/10 1500 days true 3.83 4%
Anna Jungclaus 9/10 1507 days true 4.19 5%
Signe Broedbaek 7/10 1509 days true 3.81 4%
Petra Fragner 10/10 1515 days true 4.18 5%
Koehler Ute 10/10 1527 days 4.15 5%
Niclas Ullno 8/10 1530 days true 3.94 4%
Tamara 7/10 1531 days true 3.77 4%
Chloe Guerillot 9/10 1541 days true 4.13 5%
Luisa and Hannes 9/10 1554 days true 4.1 5%
elena salimzhanova 10/10 1558 days 4.09 5%
Jakub Trojanek 8/10 1569 days true 3.87 4%
Malina 10/10 1575 days true 4.06 5%
Emma Keegan 7/10 1833 days 3.24 4%
Emilie Normand 7/10 1904 days true 3.11 3%
Christopher Buch Madsen 8/10 2225 days true 2.65 3%
Phil Bromby 9/10 2227 days true 2.78 3%
Tobias Thull 7/10 2233 days true 2.52 3%
Rita Hochstiasser 8/10 2255 days true 2.59 3%
Nelle Dutilleur 10/10 2276 days true 2.69 3%
Mathias Butterlin 8/10 2276 days true 2.55 3%
Daryl 8/10 2284 days true 2.54 3%
Bert Pubeg 9/10 2350 days 2.54 3%
Alex 8/10 2654 days 1.85 2%
Lucie 9/10 2690 days true 1.88 2%
Henzen 9/10 2694 days true 1.87 2%
Roy Barton 9/10 2957 days true 1.36 2%
Brian Livesey 9/10 2965 days true 1.34 1%
Merlyn 8/10 2973 days true 1.26 1%
Beyeler 10/10 2977 days true 1.32 1%
Ralf Glaser 7/10 2977 days true 1.2 1%
Suzanne van Kol 8/10 2982 days true 1.24 1%
kiwifrenchy 10/10 2989 days 1.29 1%
_mel_ 9/10 3020 days 1.23 1%
C 10/10 3020 days 1.23 1%
Sarah and Soren 10/10 3057 days true 1.16 1%
Erik Folkersen 10/10 3065 days true 1.14 1%
Rudlinger 10/10 3068 days true 1.14 1%
GenH 10/10 3295 days 0.69 1%
R Tearle 10/10 3304 days true 0.68 1%
Franzi & Tobi 10/10 3306 days true 0.67 1%
Nathalie 10/10 3310 days true 0.67 1%
Ven 9/10 3312 days true 0.66 1%
Jerven and Kim 10/10 3319 days true 0.65 1%
Sarah Luijckx 1/10 3321 days true 0.47 1%
Alan Jeffery 7/10 3322 days true 0.58 1%
Birgette Weiner 9/10 3340 days true 0.61 1%
Tim Van Nispen 9/10 3342 days true 0.6 1%
Bottcher 10/10 3342 days true 0.6 1%
Sue & Graham Mullin 10/10 3349 days true 0.59 1%
John Simpson 9/10 3351 days true 0.59 1%
Karen Phillips 9/10 3351 days true 0.59 1%
Michelle Booty 8/10 3353 days true 0.55 1%
Nadia Husain 7/10 3354 days true 0.53 1%
Dietmar Gans 10/10 3660 days 0.0 0%
Matt Roper 10/10 3682 days true 0.0 0%
Chris Glasg 10/10 3699 days true 0.0 0%
Jamie Hallifax 9/10 3710 days true 0.0 0%
Paul Ritchie 10/10 3714 days true 0.0 0%
Gerry Donoghue 10/10 3733 days true 0.0 0%
Yvonne German 9/10 3736 days true 0.0 0%
DebbieM 5/10 3750 days 0.0 0%
mj111 10/10 3750 days 0.0 0%
Susann Koschmeider 10/10 3785 days true 0.0 0%
X Otte 10/10 3789 days true 0.0 0%
Hans Hoff 10/10 3789 days true 0.0 0%
Solveig Mosinski 10/10 3793 days true 0.0 0%
Val and Barnie Weir 10/10 3804 days true 0.0 0%
Wim Put 9/10 3807 days true 0.0 0%
discerner 10/10 3811 days 0.0 0%
Phillip Reade 10/10 3811 days 0.0 0%
Tim Beuzeval 9/10 3811 days true 0.0 0%
barp 9/10 3842 days true 0.0 0%
Becky Fairweather 10/10 3995 days 0.0 0%
David 10/10 4025 days 0.0 0%
martinat 10/10 4025 days true 0.0 0%
Mike 9/10 4034 days true 0.0 0%
MichaelS1 9/10 4041 days true 0.0 0%
StefanieGermany 9/10 4042 days true 0.0 0%
Veronika 9/10 4044 days true 0.0 0%
Ralph Boese 7/10 4045 days true 0.0 0%
ToyalFrance 9/10 4045 days true 0.0 0%
ReneeA 9/10 4073 days true 0.0 0%
Lorna 8/10 4074 days true 0.0 0%
Bruce 10/10 4075 days true 0.0 0%
Sandra 10/10 4082 days true 0.0 0%
Heidi 7/10 4089 days true 0.0 0%
Philipp 9/10 4089 days true 0.0 0%
Simon 9/10 4091 days true 0.0 0%
Kathryn 8/10 4092 days true 0.0 0%
Barbara 9/10 4097 days true 0.0 0%
Joachim 10/10 4097 days true 0.0 0%
Ans 7/10 4098 days true 0.0 0%
Minder 10/10 4099 days true 0.0 0%
Evi 7/10 4130 days true 0.0 0%
Ann Maree 9/10 4133 days 0.0 0%
Trine 9/10 4143 days true 0.0 0%
Carina Korn 10/10 4240 days true 0.0 0%
Christian 7/10 4240 days true 0.0 0%
Nick 10/10 4243 days true 0.0 0%
Terri Scott 7/10 4260 days true 0.0 0%
Alan Bellerby 10/10 4411 days true 0.0 0%
Robert 4/10 4417 days true 0.0 0%
Elise 10/10 4417 days true 0.0 0%
Fung 8/10 4417 days true 0.0 0%
Peter Aston 9/10 4417 days true 0.0 0%
Tony Wicks 8/10 4422 days true 0.0 0%
Sue 8/10 4429 days true 0.0 0%
Carla 9/10 4437 days true 0.0 0%
Melissa Steedman 9/10 4464 days true 0.0 0%
Vanessa Brennan 7/10 4464 days true 0.0 0%
Tim 9/10 4465 days true 0.0 0%
Mary 10/10 4515 days true 0.0 0%
Agnes 9/10 4731 days true 0.0 0%
Cohen 9/10 4751 days true 0.0 0%
John 8/10 4755 days true 0.0 0%
SueLinsk 9/10 4755 days true 0.0 0%
Frauke 7/10 4797 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

-3.98% 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 199 days. Adjustments are according to the following table.

Days Adjustment
196 -3.92%
197 -3.94%
198 -3.96%
199 -3.98%
200 -4.00%
201 -4.02%
202 -4.04%

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.