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
89.51%
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 | 2535 days | 100% |
| Amanda Walden | 10/10 | 3418 days | 47% |
| Monique Pos | 9/10 | 3508 days | 41% |
| Alison Egan-Jones | 9/10 | 3538 days | 39% |
| Sylvain Schiber | 9/10 | 3538 days | 39% |
| Sylvain Chanton | 10/10 | 3543 days | 40% |
| Julian Gury | 8/10 | 3551 days | 38% |
| R. Damen | 9/10 | 3569 days | 37% |
| Michelle Smit | 10/10 | 3630 days | 34% |
| Gesa Roemer | 8/10 | 3759 days | 26% |
| Anais Roux | 10/10 | 3764 days | 26% |
| Luca Staudt | 8/10 | 3783 days | 24% |
| Florian Bisault | 7/10 | 3784 days | 23% |
| Anna Jungclaus | 9/10 | 3791 days | 24% |
| Signe Broedbaek | 7/10 | 3793 days | 22% |
| Petra Fragner | 10/10 | 3799 days | 24% |
| Koehler Ute | 10/10 | 3812 days | 23% |
| Niclas Ullno | 8/10 | 3814 days | 23% |
| Tamara | 7/10 | 3815 days | 21% |
| Chloe Guerillot | 9/10 | 3825 days | 22% |
| Luisa and Hannes | 9/10 | 3838 days | 21% |
| elena salimzhanova | 10/10 | 3843 days | 22% |
| Jakub Trojanek | 8/10 | 3853 days | 20% |
| Malina | 10/10 | 3859 days | 21% |
| Emma Keegan | 7/10 | 4118 days | 4% |
| Emilie Normand | 7/10 | 4188 days | 0% |
| Christopher Buch Madsen | 8/10 | 4509 days | 19% |
| Phil Bromby | 9/10 | 4511 days | 20% |
| Tobias Thull | 7/10 | 4517 days | 18% |
| Rita Hochstiasser | 8/10 | 4539 days | 19% |
| Nelle Dutilleur | 10/10 | 4560 days | 20% |
| Mathias Butterlin | 8/10 | 4560 days | 19% |
| Daryl | 8/10 | 4568 days | 19% |
| Bert Pubeg | 9/10 | 4634 days | 20% |
| Alex | 8/10 | 4938 days | 19% |
| Lucie | 9/10 | 4974 days | 20% |
| Henzen | 9/10 | 4978 days | 20% |
| Roy Barton | 9/10 | 5241 days | 20% |
| Brian Livesey | 9/10 | 5249 days | 20% |
| Merlyn | 8/10 | 5257 days | 19% |
| Beyeler | 10/10 | 5261 days | 20% |
| Ralf Glaser | 7/10 | 5261 days | 18% |
| Suzanne van Kol | 8/10 | 5266 days | 19% |
| kiwifrenchy | 10/10 | 5273 days | 20% |
| _mel_ | 9/10 | 5304 days | 20% |
| C | 10/10 | 5304 days | 20% |
| Sarah and Soren | 10/10 | 5341 days | 20% |
| Erik Folkersen | 10/10 | 5349 days | 20% |
| Rudlinger | 10/10 | 5352 days | 20% |
| GenH | 10/10 | 5579 days | 20% |
| R Tearle | 10/10 | 5588 days | 20% |
| Franzi & Tobi | 10/10 | 5590 days | 20% |
| Nathalie | 10/10 | 5594 days | 20% |
| Ven | 9/10 | 5596 days | 20% |
| Jerven and Kim | 10/10 | 5603 days | 20% |
| Sarah Luijckx | 1/10 | 5605 days | 2% |
| Alan Jeffery | 7/10 | 5606 days | 18% |
| Birgette Weiner | 9/10 | 5624 days | 20% |
| Tim Van Nispen | 9/10 | 5626 days | 20% |
| Bottcher | 10/10 | 5626 days | 20% |
| Sue & Graham Mullin | 10/10 | 5633 days | 20% |
| John Simpson | 9/10 | 5635 days | 20% |
| Karen Phillips | 9/10 | 5635 days | 20% |
| Michelle Booty | 8/10 | 5637 days | 19% |
| Nadia Husain | 7/10 | 5638 days | 18% |
| Dietmar Gans | 10/10 | 5944 days | 20% |
| Matt Roper | 10/10 | 5966 days | 20% |
| Chris Glasg | 10/10 | 5983 days | 20% |
| Jamie Hallifax | 9/10 | 5994 days | 20% |
| Paul Ritchie | 10/10 | 5998 days | 20% |
| Gerry Donoghue | 10/10 | 6017 days | 20% |
| Yvonne German | 9/10 | 6020 days | 20% |
| DebbieM | 5/10 | 6034 days | 13% |
| mj111 | 10/10 | 6034 days | 20% |
| Susann Koschmeider | 10/10 | 6069 days | 20% |
| X Otte | 10/10 | 6073 days | 20% |
| Hans Hoff | 10/10 | 6073 days | 20% |
| Solveig Mosinski | 10/10 | 6077 days | 20% |
| Val and Barnie Weir | 10/10 | 6088 days | 20% |
| Wim Put | 9/10 | 6091 days | 20% |
| discerner | 10/10 | 6095 days | 20% |
| Phillip Reade | 10/10 | 6095 days | 20% |
| Tim Beuzeval | 9/10 | 6095 days | 20% |
| barp | 9/10 | 6126 days | 20% |
| Becky Fairweather | 10/10 | 6279 days | 20% |
| David | 10/10 | 6309 days | 20% |
| martinat | 10/10 | 6309 days | 20% |
| Mike | 9/10 | 6319 days | 20% |
| MichaelS1 | 9/10 | 6325 days | 20% |
| StefanieGermany | 9/10 | 6327 days | 20% |
| Veronika | 9/10 | 6329 days | 20% |
| Ralph Boese | 7/10 | 6329 days | 18% |
| ToyalFrance | 9/10 | 6329 days | 20% |
| ReneeA | 9/10 | 6357 days | 20% |
| Lorna | 8/10 | 6359 days | 19% |
| Bruce | 10/10 | 6360 days | 20% |
| Sandra | 10/10 | 6367 days | 20% |
| Heidi | 7/10 | 6374 days | 18% |
| Philipp | 9/10 | 6374 days | 20% |
| Simon | 9/10 | 6376 days | 20% |
| Kathryn | 8/10 | 6377 days | 19% |
| Barbara | 9/10 | 6382 days | 20% |
| Joachim | 10/10 | 6382 days | 20% |
| Ans | 7/10 | 6383 days | 18% |
| Minder | 10/10 | 6384 days | 20% |
| Evi | 7/10 | 6415 days | 18% |
| Ann Maree | 9/10 | 6418 days | 20% |
| Trine | 9/10 | 6428 days | 20% |
| Carina Korn | 10/10 | 6525 days | 20% |
| Christian | 7/10 | 6525 days | 18% |
| Nick | 10/10 | 6528 days | 20% |
| Terri Scott | 7/10 | 6545 days | 18% |
| Alan Bellerby | 10/10 | 6695 days | 20% |
| Robert | 4/10 | 6701 days | 9% |
| Elise | 10/10 | 6701 days | 20% |
| Fung | 8/10 | 6701 days | 19% |
| Peter Aston | 9/10 | 6701 days | 20% |
| Tony Wicks | 8/10 | 6706 days | 19% |
| Sue | 8/10 | 6713 days | 19% |
| Carla | 9/10 | 6721 days | 20% |
| Melissa Steedman | 9/10 | 6748 days | 20% |
| Vanessa Brennan | 7/10 | 6748 days | 18% |
| Tim | 9/10 | 6749 days | 20% |
| Mary | 10/10 | 6799 days | 20% |
| Agnes | 9/10 | 7015 days | 20% |
| Cohen | 9/10 | 7035 days | 20% |
| John | 8/10 | 7039 days | 19% |
| SueLinsk | 9/10 | 7039 days | 20% |
| Frauke | 7/10 | 7081 days | 18% |
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
-2.00% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 125 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 | -1.97% |
| 198 | -1.98% |
| 199 | -1.99% |
| 200 | -2.00% |
| 201 | -2.01% |
| 202 | -2.02% |
| 203 | -2.03% |
| … | … |
Balancing Adjustment
1.37% 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.