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
89.59%
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 | 2658 days | 100% |
| Amanda Walden | 10/10 | 3541 days | 47% |
| Monique Pos | 9/10 | 3631 days | 41% |
| Alison Egan-Jones | 9/10 | 3661 days | 39% |
| Sylvain Schiber | 9/10 | 3661 days | 39% |
| Sylvain Chanton | 10/10 | 3666 days | 39% |
| Julian Gury | 8/10 | 3674 days | 38% |
| R. Damen | 9/10 | 3692 days | 37% |
| Michelle Smit | 10/10 | 3753 days | 34% |
| Gesa Roemer | 8/10 | 3882 days | 26% |
| Anais Roux | 10/10 | 3887 days | 26% |
| Luca Staudt | 8/10 | 3906 days | 24% |
| Florian Bisault | 7/10 | 3907 days | 23% |
| Anna Jungclaus | 9/10 | 3914 days | 24% |
| Signe Broedbaek | 7/10 | 3916 days | 22% |
| Petra Fragner | 10/10 | 3922 days | 24% |
| Koehler Ute | 10/10 | 3935 days | 23% |
| Niclas Ullno | 8/10 | 3937 days | 22% |
| Tamara | 7/10 | 3938 days | 21% |
| Chloe Guerillot | 9/10 | 3948 days | 22% |
| Luisa and Hannes | 9/10 | 3961 days | 21% |
| elena salimzhanova | 10/10 | 3966 days | 21% |
| Jakub Trojanek | 8/10 | 3976 days | 20% |
| Malina | 10/10 | 3982 days | 20% |
| Emma Keegan | 7/10 | 4241 days | 4% |
| Emilie Normand | 7/10 | 4311 days | 0% |
| Christopher Buch Madsen | 8/10 | 4632 days | 26% |
| Phil Bromby | 9/10 | 4634 days | 27% |
| Tobias Thull | 7/10 | 4640 days | 25% |
| Rita Hochstiasser | 8/10 | 4662 days | 26% |
| Nelle Dutilleur | 10/10 | 4683 days | 27% |
| Mathias Butterlin | 8/10 | 4683 days | 26% |
| Daryl | 8/10 | 4691 days | 26% |
| Bert Pubeg | 9/10 | 4757 days | 27% |
| Alex | 8/10 | 5061 days | 26% |
| Lucie | 9/10 | 5097 days | 27% |
| Henzen | 9/10 | 5101 days | 27% |
| Roy Barton | 9/10 | 5364 days | 27% |
| Brian Livesey | 9/10 | 5372 days | 27% |
| Merlyn | 8/10 | 5380 days | 26% |
| Beyeler | 10/10 | 5384 days | 27% |
| Ralf Glaser | 7/10 | 5384 days | 25% |
| Suzanne van Kol | 8/10 | 5389 days | 26% |
| kiwifrenchy | 10/10 | 5396 days | 27% |
| _mel_ | 9/10 | 5427 days | 27% |
| C | 10/10 | 5427 days | 27% |
| Sarah and Soren | 10/10 | 5464 days | 27% |
| Erik Folkersen | 10/10 | 5472 days | 27% |
| Rudlinger | 10/10 | 5475 days | 27% |
| GenH | 10/10 | 5702 days | 27% |
| R Tearle | 10/10 | 5711 days | 27% |
| Franzi & Tobi | 10/10 | 5713 days | 27% |
| Nathalie | 10/10 | 5717 days | 27% |
| Ven | 9/10 | 5719 days | 27% |
| Jerven and Kim | 10/10 | 5726 days | 27% |
| Sarah Luijckx | 1/10 | 5728 days | 9% |
| Alan Jeffery | 7/10 | 5729 days | 25% |
| Birgette Weiner | 9/10 | 5747 days | 27% |
| Tim Van Nispen | 9/10 | 5749 days | 27% |
| Bottcher | 10/10 | 5749 days | 27% |
| Sue & Graham Mullin | 10/10 | 5756 days | 27% |
| John Simpson | 9/10 | 5758 days | 27% |
| Karen Phillips | 9/10 | 5758 days | 27% |
| Michelle Booty | 8/10 | 5760 days | 26% |
| Nadia Husain | 7/10 | 5761 days | 25% |
| Dietmar Gans | 10/10 | 6067 days | 27% |
| Matt Roper | 10/10 | 6089 days | 27% |
| Chris Glasg | 10/10 | 6106 days | 27% |
| Jamie Hallifax | 9/10 | 6117 days | 27% |
| Paul Ritchie | 10/10 | 6121 days | 27% |
| Gerry Donoghue | 10/10 | 6140 days | 27% |
| Yvonne German | 9/10 | 6143 days | 27% |
| DebbieM | 5/10 | 6157 days | 20% |
| mj111 | 10/10 | 6157 days | 27% |
| Susann Koschmeider | 10/10 | 6192 days | 27% |
| X Otte | 10/10 | 6196 days | 27% |
| Hans Hoff | 10/10 | 6196 days | 27% |
| Solveig Mosinski | 10/10 | 6200 days | 27% |
| Val and Barnie Weir | 10/10 | 6211 days | 27% |
| Wim Put | 9/10 | 6214 days | 27% |
| discerner | 10/10 | 6218 days | 27% |
| Phillip Reade | 10/10 | 6218 days | 27% |
| Tim Beuzeval | 9/10 | 6218 days | 27% |
| barp | 9/10 | 6249 days | 27% |
| Becky Fairweather | 10/10 | 6402 days | 27% |
| David | 10/10 | 6432 days | 27% |
| martinat | 10/10 | 6432 days | 27% |
| Mike | 9/10 | 6442 days | 27% |
| MichaelS1 | 9/10 | 6448 days | 27% |
| StefanieGermany | 9/10 | 6450 days | 27% |
| Veronika | 9/10 | 6452 days | 27% |
| Ralph Boese | 7/10 | 6452 days | 25% |
| ToyalFrance | 9/10 | 6452 days | 27% |
| ReneeA | 9/10 | 6480 days | 27% |
| Lorna | 8/10 | 6482 days | 26% |
| Bruce | 10/10 | 6483 days | 27% |
| Sandra | 10/10 | 6489 days | 27% |
| Heidi | 7/10 | 6497 days | 25% |
| Philipp | 9/10 | 6497 days | 27% |
| Simon | 9/10 | 6498 days | 27% |
| Kathryn | 8/10 | 6499 days | 26% |
| Barbara | 9/10 | 6504 days | 27% |
| Joachim | 10/10 | 6505 days | 27% |
| Ans | 7/10 | 6505 days | 25% |
| Minder | 10/10 | 6507 days | 27% |
| Evi | 7/10 | 6538 days | 25% |
| Ann Maree | 9/10 | 6541 days | 27% |
| Trine | 9/10 | 6551 days | 27% |
| Carina Korn | 10/10 | 6648 days | 27% |
| Christian | 7/10 | 6648 days | 25% |
| Nick | 10/10 | 6651 days | 27% |
| Terri Scott | 7/10 | 6668 days | 25% |
| Alan Bellerby | 10/10 | 6818 days | 27% |
| Robert | 4/10 | 6824 days | 16% |
| Elise | 10/10 | 6824 days | 27% |
| Fung | 8/10 | 6824 days | 26% |
| Peter Aston | 9/10 | 6824 days | 27% |
| Tony Wicks | 8/10 | 6829 days | 26% |
| Sue | 8/10 | 6836 days | 26% |
| Carla | 9/10 | 6844 days | 27% |
| Melissa Steedman | 9/10 | 6871 days | 27% |
| Vanessa Brennan | 7/10 | 6871 days | 25% |
| Tim | 9/10 | 6872 days | 27% |
| Mary | 10/10 | 6922 days | 27% |
| Agnes | 9/10 | 7138 days | 27% |
| Cohen | 9/10 | 7158 days | 27% |
| John | 8/10 | 7162 days | 26% |
| SueLinsk | 9/10 | 7162 days | 27% |
| Frauke | 7/10 | 7204 days | 25% |
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
-3.96% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 46 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 | -3.90% |
| 198 | -3.92% |
| 199 | -3.94% |
| 200 | -3.96% |
| 201 | -3.98% |
| 202 | -4.00% |
| 203 | -4.02% |
| … | … |
Balancing Adjustment
1.70% 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.