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
89.50%
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 | 2515 days | 100% |
| Amanda Walden | 10/10 | 3398 days | 47% |
| Monique Pos | 9/10 | 3488 days | 41% |
| Alison Egan-Jones | 9/10 | 3518 days | 39% |
| Sylvain Schiber | 9/10 | 3519 days | 39% |
| Sylvain Chanton | 10/10 | 3524 days | 40% |
| Julian Gury | 8/10 | 3532 days | 38% |
| R. Damen | 9/10 | 3549 days | 38% |
| Michelle Smit | 10/10 | 3610 days | 34% |
| Gesa Roemer | 8/10 | 3740 days | 26% |
| Anais Roux | 10/10 | 3745 days | 26% |
| Luca Staudt | 8/10 | 3764 days | 24% |
| Florian Bisault | 7/10 | 3765 days | 23% |
| Anna Jungclaus | 9/10 | 3772 days | 24% |
| Signe Broedbaek | 7/10 | 3774 days | 22% |
| Petra Fragner | 10/10 | 3780 days | 24% |
| Koehler Ute | 10/10 | 3792 days | 23% |
| Niclas Ullno | 8/10 | 3795 days | 23% |
| Tamara | 7/10 | 3796 days | 21% |
| Chloe Guerillot | 9/10 | 3806 days | 22% |
| Luisa and Hannes | 9/10 | 3819 days | 22% |
| elena salimzhanova | 10/10 | 3823 days | 22% |
| Jakub Trojanek | 8/10 | 3834 days | 20% |
| Malina | 10/10 | 3840 days | 21% |
| Emma Keegan | 7/10 | 4098 days | 4% |
| Emilie Normand | 7/10 | 4169 days | 0% |
| Christopher Buch Madsen | 8/10 | 4490 days | 18% |
| Phil Bromby | 9/10 | 4492 days | 19% |
| Tobias Thull | 7/10 | 4498 days | 17% |
| Rita Hochstiasser | 8/10 | 4520 days | 18% |
| Nelle Dutilleur | 10/10 | 4541 days | 19% |
| Mathias Butterlin | 8/10 | 4541 days | 18% |
| Daryl | 8/10 | 4549 days | 18% |
| Bert Pubeg | 9/10 | 4615 days | 19% |
| Alex | 8/10 | 4919 days | 18% |
| Lucie | 9/10 | 4955 days | 19% |
| Henzen | 9/10 | 4959 days | 19% |
| Roy Barton | 9/10 | 5222 days | 19% |
| Brian Livesey | 9/10 | 5230 days | 19% |
| Merlyn | 8/10 | 5238 days | 18% |
| Beyeler | 10/10 | 5242 days | 19% |
| Ralf Glaser | 7/10 | 5242 days | 17% |
| Suzanne van Kol | 8/10 | 5247 days | 18% |
| kiwifrenchy | 10/10 | 5254 days | 19% |
| _mel_ | 9/10 | 5285 days | 19% |
| C | 10/10 | 5285 days | 19% |
| Sarah and Soren | 10/10 | 5322 days | 19% |
| Erik Folkersen | 10/10 | 5330 days | 19% |
| Rudlinger | 10/10 | 5333 days | 19% |
| GenH | 10/10 | 5560 days | 19% |
| R Tearle | 10/10 | 5569 days | 19% |
| Franzi & Tobi | 10/10 | 5571 days | 19% |
| Nathalie | 10/10 | 5575 days | 19% |
| Ven | 9/10 | 5577 days | 19% |
| Jerven and Kim | 10/10 | 5584 days | 19% |
| Sarah Luijckx | 1/10 | 5586 days | 1% |
| Alan Jeffery | 7/10 | 5587 days | 17% |
| Birgette Weiner | 9/10 | 5605 days | 19% |
| Tim Van Nispen | 9/10 | 5607 days | 19% |
| Bottcher | 10/10 | 5607 days | 19% |
| Sue & Graham Mullin | 10/10 | 5614 days | 19% |
| John Simpson | 9/10 | 5616 days | 19% |
| Karen Phillips | 9/10 | 5616 days | 19% |
| Michelle Booty | 8/10 | 5618 days | 18% |
| Nadia Husain | 7/10 | 5619 days | 17% |
| Dietmar Gans | 10/10 | 5925 days | 19% |
| Matt Roper | 10/10 | 5947 days | 19% |
| Chris Glasg | 10/10 | 5964 days | 19% |
| Jamie Hallifax | 9/10 | 5975 days | 19% |
| Paul Ritchie | 10/10 | 5979 days | 19% |
| Gerry Donoghue | 10/10 | 5998 days | 19% |
| Yvonne German | 9/10 | 6001 days | 19% |
| DebbieM | 5/10 | 6015 days | 12% |
| mj111 | 10/10 | 6015 days | 19% |
| Susann Koschmeider | 10/10 | 6050 days | 19% |
| X Otte | 10/10 | 6054 days | 19% |
| Hans Hoff | 10/10 | 6054 days | 19% |
| Solveig Mosinski | 10/10 | 6058 days | 19% |
| Val and Barnie Weir | 10/10 | 6069 days | 19% |
| Wim Put | 9/10 | 6072 days | 19% |
| discerner | 10/10 | 6076 days | 19% |
| Phillip Reade | 10/10 | 6076 days | 19% |
| Tim Beuzeval | 9/10 | 6076 days | 19% |
| barp | 9/10 | 6107 days | 19% |
| Becky Fairweather | 10/10 | 6260 days | 19% |
| David | 10/10 | 6290 days | 19% |
| martinat | 10/10 | 6290 days | 19% |
| Mike | 9/10 | 6299 days | 19% |
| MichaelS1 | 9/10 | 6306 days | 19% |
| StefanieGermany | 9/10 | 6307 days | 19% |
| Veronika | 9/10 | 6309 days | 19% |
| Ralph Boese | 7/10 | 6310 days | 17% |
| ToyalFrance | 9/10 | 6310 days | 19% |
| ReneeA | 9/10 | 6338 days | 19% |
| Lorna | 8/10 | 6339 days | 18% |
| Bruce | 10/10 | 6340 days | 19% |
| Sandra | 10/10 | 6347 days | 19% |
| Heidi | 7/10 | 6354 days | 17% |
| Philipp | 9/10 | 6354 days | 19% |
| Simon | 9/10 | 6356 days | 19% |
| Kathryn | 8/10 | 6357 days | 18% |
| Barbara | 9/10 | 6362 days | 19% |
| Joachim | 10/10 | 6362 days | 19% |
| Ans | 7/10 | 6363 days | 17% |
| Minder | 10/10 | 6364 days | 19% |
| Evi | 7/10 | 6395 days | 17% |
| Ann Maree | 9/10 | 6398 days | 19% |
| Trine | 9/10 | 6408 days | 19% |
| Carina Korn | 10/10 | 6505 days | 19% |
| Christian | 7/10 | 6505 days | 17% |
| Nick | 10/10 | 6508 days | 19% |
| Terri Scott | 7/10 | 6525 days | 17% |
| Alan Bellerby | 10/10 | 6676 days | 19% |
| Robert | 4/10 | 6682 days | 8% |
| Elise | 10/10 | 6682 days | 19% |
| Fung | 8/10 | 6682 days | 18% |
| Peter Aston | 9/10 | 6682 days | 19% |
| Tony Wicks | 8/10 | 6687 days | 18% |
| Sue | 8/10 | 6694 days | 18% |
| Carla | 9/10 | 6702 days | 19% |
| Melissa Steedman | 9/10 | 6729 days | 19% |
| Vanessa Brennan | 7/10 | 6729 days | 17% |
| Tim | 9/10 | 6730 days | 19% |
| Mary | 10/10 | 6780 days | 19% |
| Agnes | 9/10 | 6996 days | 19% |
| Cohen | 9/10 | 7016 days | 19% |
| John | 8/10 | 7020 days | 18% |
| SueLinsk | 9/10 | 7020 days | 19% |
| Frauke | 7/10 | 7062 days | 17% |
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
-2.14% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 119 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 | -2.11% |
| 198 | -2.12% |
| 199 | -2.13% |
| 200 | -2.14% |
| 201 | -2.15% |
| 202 | -2.16% |
| 203 | -2.17% |
| … | … |
Balancing Adjustment
1.40% 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.