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
89.62%
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 | 2384 days | 100% |
| Amanda Walden | 10/10 | 3267 days | 55% |
| Monique Pos | 9/10 | 3357 days | 50% |
| Alison Egan-Jones | 9/10 | 3387 days | 49% |
| Sylvain Schiber | 9/10 | 3388 days | 49% |
| Sylvain Chanton | 10/10 | 3393 days | 49% |
| Julian Gury | 8/10 | 3401 days | 48% |
| R. Damen | 9/10 | 3418 days | 47% |
| Michelle Smit | 10/10 | 3479 days | 45% |
| Gesa Roemer | 8/10 | 3609 days | 37% |
| Anais Roux | 10/10 | 3614 days | 38% |
| Luca Staudt | 8/10 | 3633 days | 36% |
| Florian Bisault | 7/10 | 3634 days | 34% |
| Anna Jungclaus | 9/10 | 3641 days | 36% |
| Signe Broedbaek | 7/10 | 3643 days | 34% |
| Petra Fragner | 10/10 | 3649 days | 36% |
| Koehler Ute | 10/10 | 3661 days | 36% |
| Niclas Ullno | 8/10 | 3664 days | 35% |
| Tamara | 7/10 | 3665 days | 33% |
| Chloe Guerillot | 9/10 | 3675 days | 35% |
| Luisa and Hannes | 9/10 | 3688 days | 34% |
| elena salimzhanova | 10/10 | 3692 days | 34% |
| Jakub Trojanek | 8/10 | 3703 days | 33% |
| Malina | 10/10 | 3709 days | 33% |
| Emma Keegan | 7/10 | 3967 days | 19% |
| Emilie Normand | 7/10 | 4038 days | 15% |
| Christopher Buch Madsen | 8/10 | 4359 days | 0% |
| Phil Bromby | 9/10 | 4361 days | 0% |
| Tobias Thull | 7/10 | 4367 days | 0% |
| Rita Hochstiasser | 8/10 | 4389 days | 25% |
| Nelle Dutilleur | 10/10 | 4410 days | 25% |
| Mathias Butterlin | 8/10 | 4410 days | 25% |
| Daryl | 8/10 | 4418 days | 25% |
| Bert Pubeg | 9/10 | 4484 days | 25% |
| Alex | 8/10 | 4788 days | 25% |
| Lucie | 9/10 | 4824 days | 25% |
| Henzen | 9/10 | 4828 days | 25% |
| Roy Barton | 9/10 | 5091 days | 25% |
| Brian Livesey | 9/10 | 5099 days | 25% |
| Merlyn | 8/10 | 5107 days | 25% |
| Beyeler | 10/10 | 5111 days | 25% |
| Ralf Glaser | 7/10 | 5111 days | 23% |
| Suzanne van Kol | 8/10 | 5116 days | 25% |
| kiwifrenchy | 10/10 | 5123 days | 25% |
| _mel_ | 9/10 | 5154 days | 25% |
| C | 10/10 | 5154 days | 25% |
| Sarah and Soren | 10/10 | 5191 days | 25% |
| Erik Folkersen | 10/10 | 5199 days | 25% |
| Rudlinger | 10/10 | 5202 days | 25% |
| GenH | 10/10 | 5429 days | 25% |
| R Tearle | 10/10 | 5438 days | 25% |
| Franzi & Tobi | 10/10 | 5440 days | 25% |
| Nathalie | 10/10 | 5444 days | 25% |
| Ven | 9/10 | 5446 days | 25% |
| Jerven and Kim | 10/10 | 5453 days | 25% |
| Sarah Luijckx | 1/10 | 5455 days | 10% |
| Alan Jeffery | 7/10 | 5456 days | 23% |
| Birgette Weiner | 9/10 | 5474 days | 25% |
| Tim Van Nispen | 9/10 | 5476 days | 25% |
| Bottcher | 10/10 | 5476 days | 25% |
| Sue & Graham Mullin | 10/10 | 5483 days | 25% |
| John Simpson | 9/10 | 5485 days | 25% |
| Karen Phillips | 9/10 | 5485 days | 25% |
| Michelle Booty | 8/10 | 5487 days | 25% |
| Nadia Husain | 7/10 | 5488 days | 23% |
| Dietmar Gans | 10/10 | 5794 days | 25% |
| Matt Roper | 10/10 | 5816 days | 25% |
| Chris Glasg | 10/10 | 5833 days | 25% |
| Jamie Hallifax | 9/10 | 5844 days | 25% |
| Paul Ritchie | 10/10 | 5848 days | 25% |
| Gerry Donoghue | 10/10 | 5867 days | 25% |
| Yvonne German | 9/10 | 5870 days | 25% |
| DebbieM | 5/10 | 5884 days | 19% |
| mj111 | 10/10 | 5884 days | 25% |
| Susann Koschmeider | 10/10 | 5919 days | 25% |
| X Otte | 10/10 | 5923 days | 25% |
| Hans Hoff | 10/10 | 5923 days | 25% |
| Solveig Mosinski | 10/10 | 5927 days | 25% |
| Val and Barnie Weir | 10/10 | 5938 days | 25% |
| Wim Put | 9/10 | 5941 days | 25% |
| discerner | 10/10 | 5945 days | 25% |
| Phillip Reade | 10/10 | 5945 days | 25% |
| Tim Beuzeval | 9/10 | 5945 days | 25% |
| barp | 9/10 | 5976 days | 25% |
| Becky Fairweather | 10/10 | 6129 days | 25% |
| David | 10/10 | 6159 days | 25% |
| martinat | 10/10 | 6159 days | 25% |
| Mike | 9/10 | 6168 days | 25% |
| MichaelS1 | 9/10 | 6175 days | 25% |
| StefanieGermany | 9/10 | 6176 days | 25% |
| Veronika | 9/10 | 6178 days | 25% |
| Ralph Boese | 7/10 | 6179 days | 23% |
| ToyalFrance | 9/10 | 6179 days | 25% |
| ReneeA | 9/10 | 6207 days | 25% |
| Lorna | 8/10 | 6208 days | 25% |
| Bruce | 10/10 | 6209 days | 25% |
| Sandra | 10/10 | 6216 days | 25% |
| Heidi | 7/10 | 6223 days | 23% |
| Philipp | 9/10 | 6223 days | 25% |
| Simon | 9/10 | 6225 days | 25% |
| Kathryn | 8/10 | 6226 days | 25% |
| Barbara | 9/10 | 6231 days | 25% |
| Joachim | 10/10 | 6231 days | 25% |
| Ans | 7/10 | 6232 days | 23% |
| Minder | 10/10 | 6233 days | 25% |
| Evi | 7/10 | 6264 days | 23% |
| Ann Maree | 9/10 | 6267 days | 25% |
| Trine | 9/10 | 6277 days | 25% |
| Carina Korn | 10/10 | 6375 days | 25% |
| Christian | 7/10 | 6375 days | 23% |
| Nick | 10/10 | 6377 days | 25% |
| Terri Scott | 7/10 | 6394 days | 23% |
| Alan Bellerby | 10/10 | 6545 days | 25% |
| Robert | 4/10 | 6551 days | 16% |
| Elise | 10/10 | 6551 days | 25% |
| Fung | 8/10 | 6551 days | 25% |
| Peter Aston | 9/10 | 6551 days | 25% |
| Tony Wicks | 8/10 | 6556 days | 25% |
| Sue | 8/10 | 6563 days | 25% |
| Carla | 9/10 | 6571 days | 25% |
| Melissa Steedman | 9/10 | 6598 days | 25% |
| Vanessa Brennan | 7/10 | 6598 days | 23% |
| Tim | 9/10 | 6599 days | 25% |
| Mary | 10/10 | 6649 days | 25% |
| Agnes | 9/10 | 6865 days | 25% |
| Cohen | 9/10 | 6885 days | 25% |
| John | 8/10 | 6889 days | 25% |
| SueLinsk | 9/10 | 6889 days | 25% |
| Frauke | 7/10 | 6931 days | 23% |
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
-4.15% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 51 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 | -4.09% |
| 198 | -4.11% |
| 199 | -4.13% |
| 200 | -4.15% |
| 201 | -4.18% |
| 202 | -4.20% |
| 203 | -4.22% |
| … | … |
Balancing Adjustment
1.73% 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
87%
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.