Hey, 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
89.50%
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 | 2502 days | 100% |
| Amanda Walden | 10/10 | 3385 days | 47% |
| Monique Pos | 9/10 | 3475 days | 41% |
| Alison Egan-Jones | 9/10 | 3505 days | 39% |
| Sylvain Schiber | 9/10 | 3506 days | 39% |
| Sylvain Chanton | 10/10 | 3511 days | 40% |
| Julian Gury | 8/10 | 3519 days | 38% |
| R. Damen | 9/10 | 3536 days | 38% |
| Michelle Smit | 10/10 | 3597 days | 34% |
| Gesa Roemer | 8/10 | 3727 days | 26% |
| Anais Roux | 10/10 | 3732 days | 26% |
| Luca Staudt | 8/10 | 3751 days | 24% |
| Florian Bisault | 7/10 | 3752 days | 23% |
| Anna Jungclaus | 9/10 | 3759 days | 24% |
| Signe Broedbaek | 7/10 | 3761 days | 22% |
| Petra Fragner | 10/10 | 3767 days | 24% |
| Koehler Ute | 10/10 | 3779 days | 24% |
| Niclas Ullno | 8/10 | 3782 days | 23% |
| Tamara | 7/10 | 3783 days | 21% |
| Chloe Guerillot | 9/10 | 3793 days | 22% |
| Luisa and Hannes | 9/10 | 3806 days | 22% |
| elena salimzhanova | 10/10 | 3810 days | 22% |
| Jakub Trojanek | 8/10 | 3821 days | 20% |
| Malina | 10/10 | 3827 days | 21% |
| Emma Keegan | 7/10 | 4085 days | 4% |
| Emilie Normand | 7/10 | 4156 days | 0% |
| Christopher Buch Madsen | 8/10 | 4477 days | 18% |
| Phil Bromby | 9/10 | 4479 days | 18% |
| Tobias Thull | 7/10 | 4485 days | 16% |
| Rita Hochstiasser | 8/10 | 4507 days | 18% |
| Nelle Dutilleur | 10/10 | 4528 days | 18% |
| Mathias Butterlin | 8/10 | 4528 days | 18% |
| Daryl | 8/10 | 4536 days | 18% |
| Bert Pubeg | 9/10 | 4602 days | 18% |
| Alex | 8/10 | 4906 days | 18% |
| Lucie | 9/10 | 4942 days | 18% |
| Henzen | 9/10 | 4946 days | 18% |
| Roy Barton | 9/10 | 5209 days | 18% |
| Brian Livesey | 9/10 | 5217 days | 18% |
| Merlyn | 8/10 | 5225 days | 18% |
| Beyeler | 10/10 | 5229 days | 18% |
| Ralf Glaser | 7/10 | 5229 days | 16% |
| Suzanne van Kol | 8/10 | 5234 days | 18% |
| kiwifrenchy | 10/10 | 5241 days | 18% |
| _mel_ | 9/10 | 5272 days | 18% |
| C | 10/10 | 5272 days | 18% |
| Sarah and Soren | 10/10 | 5309 days | 18% |
| Erik Folkersen | 10/10 | 5317 days | 18% |
| Rudlinger | 10/10 | 5320 days | 18% |
| GenH | 10/10 | 5547 days | 18% |
| R Tearle | 10/10 | 5556 days | 18% |
| Franzi & Tobi | 10/10 | 5558 days | 18% |
| Nathalie | 10/10 | 5562 days | 18% |
| Ven | 9/10 | 5564 days | 18% |
| Jerven and Kim | 10/10 | 5571 days | 18% |
| Sarah Luijckx | 1/10 | 5573 days | 0% |
| Alan Jeffery | 7/10 | 5574 days | 16% |
| Birgette Weiner | 9/10 | 5592 days | 18% |
| Tim Van Nispen | 9/10 | 5594 days | 18% |
| Bottcher | 10/10 | 5594 days | 18% |
| Sue & Graham Mullin | 10/10 | 5601 days | 18% |
| John Simpson | 9/10 | 5603 days | 18% |
| Karen Phillips | 9/10 | 5603 days | 18% |
| Michelle Booty | 8/10 | 5605 days | 18% |
| Nadia Husain | 7/10 | 5606 days | 16% |
| Dietmar Gans | 10/10 | 5912 days | 18% |
| Matt Roper | 10/10 | 5934 days | 18% |
| Chris Glasg | 10/10 | 5951 days | 18% |
| Jamie Hallifax | 9/10 | 5962 days | 18% |
| Paul Ritchie | 10/10 | 5966 days | 18% |
| Gerry Donoghue | 10/10 | 5985 days | 18% |
| Yvonne German | 9/10 | 5988 days | 18% |
| DebbieM | 5/10 | 6002 days | 11% |
| mj111 | 10/10 | 6002 days | 18% |
| Susann Koschmeider | 10/10 | 6037 days | 18% |
| X Otte | 10/10 | 6041 days | 18% |
| Hans Hoff | 10/10 | 6041 days | 18% |
| Solveig Mosinski | 10/10 | 6045 days | 18% |
| Val and Barnie Weir | 10/10 | 6056 days | 18% |
| Wim Put | 9/10 | 6059 days | 18% |
| discerner | 10/10 | 6063 days | 18% |
| Phillip Reade | 10/10 | 6063 days | 18% |
| Tim Beuzeval | 9/10 | 6063 days | 18% |
| barp | 9/10 | 6094 days | 18% |
| Becky Fairweather | 10/10 | 6247 days | 18% |
| David | 10/10 | 6277 days | 18% |
| martinat | 10/10 | 6277 days | 18% |
| Mike | 9/10 | 6286 days | 18% |
| MichaelS1 | 9/10 | 6293 days | 18% |
| StefanieGermany | 9/10 | 6294 days | 18% |
| Veronika | 9/10 | 6296 days | 18% |
| Ralph Boese | 7/10 | 6297 days | 16% |
| ToyalFrance | 9/10 | 6297 days | 18% |
| ReneeA | 9/10 | 6325 days | 18% |
| Lorna | 8/10 | 6326 days | 18% |
| Bruce | 10/10 | 6327 days | 18% |
| Sandra | 10/10 | 6334 days | 18% |
| Heidi | 7/10 | 6341 days | 16% |
| Philipp | 9/10 | 6341 days | 18% |
| Simon | 9/10 | 6343 days | 18% |
| Kathryn | 8/10 | 6344 days | 18% |
| Barbara | 9/10 | 6349 days | 18% |
| Joachim | 10/10 | 6349 days | 18% |
| Ans | 7/10 | 6350 days | 16% |
| Minder | 10/10 | 6351 days | 18% |
| Evi | 7/10 | 6382 days | 16% |
| Ann Maree | 9/10 | 6385 days | 18% |
| Trine | 9/10 | 6395 days | 18% |
| Carina Korn | 10/10 | 6492 days | 18% |
| Christian | 7/10 | 6492 days | 16% |
| Nick | 10/10 | 6495 days | 18% |
| Terri Scott | 7/10 | 6512 days | 16% |
| Alan Bellerby | 10/10 | 6663 days | 18% |
| Robert | 4/10 | 6669 days | 8% |
| Elise | 10/10 | 6669 days | 18% |
| Fung | 8/10 | 6669 days | 18% |
| Peter Aston | 9/10 | 6669 days | 18% |
| Tony Wicks | 8/10 | 6674 days | 18% |
| Sue | 8/10 | 6681 days | 18% |
| Carla | 9/10 | 6689 days | 18% |
| Melissa Steedman | 9/10 | 6716 days | 18% |
| Vanessa Brennan | 7/10 | 6716 days | 16% |
| Tim | 9/10 | 6717 days | 18% |
| Mary | 10/10 | 6767 days | 18% |
| Agnes | 9/10 | 6983 days | 18% |
| Cohen | 9/10 | 7003 days | 18% |
| John | 8/10 | 7007 days | 18% |
| SueLinsk | 9/10 | 7007 days | 18% |
| Frauke | 7/10 | 7049 days | 16% |
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
-2.33% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 111 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 | -2.29% |
| 198 | -2.30% |
| 199 | -2.32% |
| 200 | -2.33% |
| 201 | -2.34% |
| 202 | -2.35% |
| 203 | -2.36% |
| … | … |
Balancing Adjustment
1.43% 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.