Hi, 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.
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
89.53%
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 | Relative Weight |
|---|---|---|---|
| Matthew Mutimer | 10/10 | 2556 days | 100% |
| Amanda Walden | 10/10 | 3439 days | 47% |
| Monique Pos | 9/10 | 3529 days | 41% |
| Alison Egan-Jones | 9/10 | 3559 days | 39% |
| Sylvain Schiber | 9/10 | 3559 days | 39% |
| Sylvain Chanton | 10/10 | 3564 days | 39% |
| Julian Gury | 8/10 | 3572 days | 38% |
| R. Damen | 9/10 | 3590 days | 37% |
| Michelle Smit | 10/10 | 3651 days | 34% |
| Gesa Roemer | 8/10 | 3780 days | 26% |
| Anais Roux | 10/10 | 3785 days | 26% |
| Luca Staudt | 8/10 | 3804 days | 24% |
| Florian Bisault | 7/10 | 3805 days | 23% |
| Anna Jungclaus | 9/10 | 3812 days | 24% |
| Signe Broedbaek | 7/10 | 3814 days | 22% |
| Petra Fragner | 10/10 | 3820 days | 24% |
| Koehler Ute | 10/10 | 3833 days | 23% |
| Niclas Ullno | 8/10 | 3835 days | 23% |
| Tamara | 7/10 | 3836 days | 21% |
| Chloe Guerillot | 9/10 | 3846 days | 22% |
| Luisa and Hannes | 9/10 | 3859 days | 21% |
| elena salimzhanova | 10/10 | 3864 days | 21% |
| Jakub Trojanek | 8/10 | 3874 days | 20% |
| Malina | 10/10 | 3880 days | 20% |
| Emma Keegan | 7/10 | 4139 days | 4% |
| Emilie Normand | 7/10 | 4209 days | 0% |
| Christopher Buch Madsen | 8/10 | 4530 days | 21% |
| Phil Bromby | 9/10 | 4532 days | 21% |
| Tobias Thull | 7/10 | 4538 days | 19% |
| Rita Hochstiasser | 8/10 | 4560 days | 21% |
| Nelle Dutilleur | 10/10 | 4581 days | 21% |
| Mathias Butterlin | 8/10 | 4581 days | 21% |
| Daryl | 8/10 | 4589 days | 21% |
| Bert Pubeg | 9/10 | 4655 days | 21% |
| Alex | 8/10 | 4959 days | 21% |
| Lucie | 9/10 | 4995 days | 21% |
| Henzen | 9/10 | 4999 days | 21% |
| Roy Barton | 9/10 | 5262 days | 21% |
| Brian Livesey | 9/10 | 5270 days | 21% |
| Merlyn | 8/10 | 5278 days | 21% |
| Beyeler | 10/10 | 5282 days | 21% |
| Ralf Glaser | 7/10 | 5282 days | 19% |
| Suzanne van Kol | 8/10 | 5287 days | 21% |
| kiwifrenchy | 10/10 | 5294 days | 21% |
| _mel_ | 9/10 | 5325 days | 21% |
| C | 10/10 | 5325 days | 21% |
| Sarah and Soren | 10/10 | 5362 days | 21% |
| Erik Folkersen | 10/10 | 5370 days | 21% |
| Rudlinger | 10/10 | 5373 days | 21% |
| GenH | 10/10 | 5600 days | 21% |
| R Tearle | 10/10 | 5609 days | 21% |
| Franzi & Tobi | 10/10 | 5611 days | 21% |
| Nathalie | 10/10 | 5615 days | 21% |
| Ven | 9/10 | 5617 days | 21% |
| Jerven and Kim | 10/10 | 5624 days | 21% |
| Sarah Luijckx | 1/10 | 5626 days | 3% |
| Alan Jeffery | 7/10 | 5627 days | 19% |
| Birgette Weiner | 9/10 | 5645 days | 21% |
| Tim Van Nispen | 9/10 | 5647 days | 21% |
| Bottcher | 10/10 | 5647 days | 21% |
| Sue & Graham Mullin | 10/10 | 5654 days | 21% |
| John Simpson | 9/10 | 5656 days | 21% |
| Karen Phillips | 9/10 | 5656 days | 21% |
| Michelle Booty | 8/10 | 5658 days | 21% |
| Nadia Husain | 7/10 | 5659 days | 19% |
| Dietmar Gans | 10/10 | 5965 days | 21% |
| Matt Roper | 10/10 | 5987 days | 21% |
| Chris Glasg | 10/10 | 6004 days | 21% |
| Jamie Hallifax | 9/10 | 6015 days | 21% |
| Paul Ritchie | 10/10 | 6019 days | 21% |
| Gerry Donoghue | 10/10 | 6038 days | 21% |
| Yvonne German | 9/10 | 6041 days | 21% |
| DebbieM | 5/10 | 6055 days | 14% |
| mj111 | 10/10 | 6055 days | 21% |
| Susann Koschmeider | 10/10 | 6090 days | 21% |
| X Otte | 10/10 | 6094 days | 21% |
| Hans Hoff | 10/10 | 6094 days | 21% |
| Solveig Mosinski | 10/10 | 6098 days | 21% |
| Val and Barnie Weir | 10/10 | 6109 days | 21% |
| Wim Put | 9/10 | 6112 days | 21% |
| discerner | 10/10 | 6116 days | 21% |
| Phillip Reade | 10/10 | 6116 days | 21% |
| Tim Beuzeval | 9/10 | 6116 days | 21% |
| barp | 9/10 | 6147 days | 21% |
| Becky Fairweather | 10/10 | 6300 days | 21% |
| David | 10/10 | 6330 days | 21% |
| martinat | 10/10 | 6330 days | 21% |
| Mike | 9/10 | 6340 days | 21% |
| MichaelS1 | 9/10 | 6346 days | 21% |
| StefanieGermany | 9/10 | 6348 days | 21% |
| Veronika | 9/10 | 6349 days | 21% |
| Ralph Boese | 7/10 | 6350 days | 19% |
| ToyalFrance | 9/10 | 6350 days | 21% |
| ReneeA | 9/10 | 6378 days | 21% |
| Lorna | 8/10 | 6380 days | 21% |
| Bruce | 10/10 | 6381 days | 21% |
| Sandra | 10/10 | 6387 days | 21% |
| Heidi | 7/10 | 6395 days | 19% |
| Philipp | 9/10 | 6395 days | 21% |
| Simon | 9/10 | 6396 days | 21% |
| Kathryn | 8/10 | 6397 days | 21% |
| Barbara | 9/10 | 6402 days | 21% |
| Joachim | 10/10 | 6402 days | 21% |
| Ans | 7/10 | 6403 days | 19% |
| Minder | 10/10 | 6404 days | 21% |
| Evi | 7/10 | 6436 days | 19% |
| Ann Maree | 9/10 | 6438 days | 21% |
| Trine | 9/10 | 6449 days | 21% |
| Carina Korn | 10/10 | 6546 days | 21% |
| Christian | 7/10 | 6546 days | 19% |
| Nick | 10/10 | 6549 days | 21% |
| Terri Scott | 7/10 | 6566 days | 19% |
| Alan Bellerby | 10/10 | 6716 days | 21% |
| Robert | 4/10 | 6722 days | 10% |
| Elise | 10/10 | 6722 days | 21% |
| Fung | 8/10 | 6722 days | 21% |
| Peter Aston | 9/10 | 6722 days | 21% |
| Tony Wicks | 8/10 | 6727 days | 21% |
| Sue | 8/10 | 6734 days | 21% |
| Carla | 9/10 | 6742 days | 21% |
| Melissa Steedman | 9/10 | 6769 days | 21% |
| Vanessa Brennan | 7/10 | 6769 days | 19% |
| Tim | 9/10 | 6770 days | 21% |
| Mary | 10/10 | 6820 days | 21% |
| Agnes | 9/10 | 7036 days | 21% |
| Cohen | 9/10 | 7056 days | 21% |
| John | 8/10 | 7060 days | 21% |
| SueLinsk | 9/10 | 7060 days | 21% |
| Frauke | 7/10 | 7102 days | 19% |
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
-2.09% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 123 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 | -2.06% |
| 198 | -2.07% |
| 199 | -2.08% |
| 200 | -2.09% |
| 201 | -2.10% |
| 202 | -2.12% |
| 203 | -2.13% |
| … | … |
Balancing Adjustment
1.38% Adjustment
Every experience's review score is adjusted to balance out the disproportional number of negative reviews that are contributed.
You won't be surprised to learn that disgruntled customers are more likely to leave a review than happy ones. They are motivated to share their experience and warn others. We consider this a good thing and it's why reading the reviews is important. However we've learned it can misrepresent the experience in a more overall sense.
We apply a balancing adjustment to counteract this effect and ensure the ranking score is a more fair representation of the experience. This adjustment is applied equally to all experiences.
Final Ranking Score
89%
The final ranking score once any adjustments, ratings, and rounding has been applied. This value is recalculated each day and a short rolling average is applied. Therefore it may not be precisely accurate based on the other values presented.