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
89.47%
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 | 2455 days | 100% |
| Amanda Walden | 10/10 | 3338 days | 49% |
| Monique Pos | 9/10 | 3428 days | 43% |
| Alison Egan-Jones | 9/10 | 3458 days | 41% |
| Sylvain Schiber | 9/10 | 3458 days | 41% |
| Sylvain Chanton | 10/10 | 3463 days | 41% |
| Julian Gury | 8/10 | 3471 days | 40% |
| R. Damen | 9/10 | 3489 days | 39% |
| Michelle Smit | 10/10 | 3550 days | 36% |
| Gesa Roemer | 8/10 | 3679 days | 28% |
| Anais Roux | 10/10 | 3684 days | 28% |
| Luca Staudt | 8/10 | 3703 days | 27% |
| Florian Bisault | 7/10 | 3704 days | 25% |
| Anna Jungclaus | 9/10 | 3711 days | 26% |
| Signe Broedbaek | 7/10 | 3713 days | 24% |
| Petra Fragner | 10/10 | 3719 days | 26% |
| Koehler Ute | 10/10 | 3732 days | 26% |
| Niclas Ullno | 8/10 | 3734 days | 25% |
| Tamara | 7/10 | 3735 days | 23% |
| Chloe Guerillot | 9/10 | 3745 days | 25% |
| Luisa and Hannes | 9/10 | 3758 days | 24% |
| elena salimzhanova | 10/10 | 3763 days | 24% |
| Jakub Trojanek | 8/10 | 3773 days | 23% |
| Malina | 10/10 | 3779 days | 23% |
| Emma Keegan | 7/10 | 4038 days | 6% |
| Emilie Normand | 7/10 | 4108 days | 3% |
| Christopher Buch Madsen | 8/10 | 4429 days | 17% |
| Phil Bromby | 9/10 | 4431 days | 17% |
| Tobias Thull | 7/10 | 4437 days | 16% |
| Rita Hochstiasser | 8/10 | 4459 days | 17% |
| Nelle Dutilleur | 10/10 | 4480 days | 18% |
| Mathias Butterlin | 8/10 | 4480 days | 17% |
| Daryl | 8/10 | 4488 days | 17% |
| Bert Pubeg | 9/10 | 4554 days | 17% |
| Alex | 8/10 | 4858 days | 17% |
| Lucie | 9/10 | 4894 days | 17% |
| Henzen | 9/10 | 4898 days | 17% |
| Roy Barton | 9/10 | 5161 days | 17% |
| Brian Livesey | 9/10 | 5169 days | 17% |
| Merlyn | 8/10 | 5177 days | 17% |
| Beyeler | 10/10 | 5181 days | 18% |
| Ralf Glaser | 7/10 | 5181 days | 16% |
| Suzanne van Kol | 8/10 | 5186 days | 17% |
| kiwifrenchy | 10/10 | 5193 days | 18% |
| _mel_ | 9/10 | 5224 days | 17% |
| C | 10/10 | 5224 days | 18% |
| Sarah and Soren | 10/10 | 5261 days | 18% |
| Erik Folkersen | 10/10 | 5269 days | 18% |
| Rudlinger | 10/10 | 5272 days | 18% |
| GenH | 10/10 | 5499 days | 18% |
| R Tearle | 10/10 | 5508 days | 18% |
| Franzi & Tobi | 10/10 | 5510 days | 18% |
| Nathalie | 10/10 | 5514 days | 18% |
| Ven | 9/10 | 5516 days | 17% |
| Jerven and Kim | 10/10 | 5523 days | 18% |
| Sarah Luijckx | 1/10 | 5525 days | 0% |
| Alan Jeffery | 7/10 | 5526 days | 16% |
| Birgette Weiner | 9/10 | 5544 days | 17% |
| Tim Van Nispen | 9/10 | 5546 days | 17% |
| Bottcher | 10/10 | 5546 days | 18% |
| Sue & Graham Mullin | 10/10 | 5553 days | 18% |
| John Simpson | 9/10 | 5555 days | 17% |
| Karen Phillips | 9/10 | 5555 days | 17% |
| Michelle Booty | 8/10 | 5557 days | 17% |
| Nadia Husain | 7/10 | 5558 days | 16% |
| Dietmar Gans | 10/10 | 5864 days | 18% |
| Matt Roper | 10/10 | 5886 days | 18% |
| Chris Glasg | 10/10 | 5903 days | 18% |
| Jamie Hallifax | 9/10 | 5914 days | 17% |
| Paul Ritchie | 10/10 | 5918 days | 18% |
| Gerry Donoghue | 10/10 | 5937 days | 18% |
| Yvonne German | 9/10 | 5940 days | 17% |
| DebbieM | 5/10 | 5954 days | 11% |
| mj111 | 10/10 | 5954 days | 18% |
| Susann Koschmeider | 10/10 | 5989 days | 18% |
| X Otte | 10/10 | 5993 days | 18% |
| Hans Hoff | 10/10 | 5993 days | 18% |
| Solveig Mosinski | 10/10 | 5997 days | 18% |
| Val and Barnie Weir | 10/10 | 6008 days | 18% |
| Wim Put | 9/10 | 6011 days | 17% |
| discerner | 10/10 | 6015 days | 18% |
| Phillip Reade | 10/10 | 6015 days | 18% |
| Tim Beuzeval | 9/10 | 6015 days | 17% |
| barp | 9/10 | 6046 days | 17% |
| Becky Fairweather | 10/10 | 6199 days | 18% |
| David | 10/10 | 6229 days | 18% |
| martinat | 10/10 | 6229 days | 18% |
| Mike | 9/10 | 6239 days | 17% |
| MichaelS1 | 9/10 | 6245 days | 17% |
| StefanieGermany | 9/10 | 6247 days | 17% |
| Veronika | 9/10 | 6248 days | 17% |
| Ralph Boese | 7/10 | 6249 days | 16% |
| ToyalFrance | 9/10 | 6249 days | 17% |
| ReneeA | 9/10 | 6277 days | 17% |
| Lorna | 8/10 | 6278 days | 17% |
| Bruce | 10/10 | 6280 days | 18% |
| Sandra | 10/10 | 6286 days | 18% |
| Heidi | 7/10 | 6293 days | 16% |
| Philipp | 9/10 | 6294 days | 17% |
| Simon | 9/10 | 6295 days | 17% |
| Kathryn | 8/10 | 6296 days | 17% |
| Barbara | 9/10 | 6301 days | 17% |
| Joachim | 10/10 | 6301 days | 18% |
| Ans | 7/10 | 6302 days | 16% |
| Minder | 10/10 | 6303 days | 18% |
| Evi | 7/10 | 6334 days | 16% |
| Ann Maree | 9/10 | 6337 days | 17% |
| Trine | 9/10 | 6347 days | 17% |
| Carina Korn | 10/10 | 6445 days | 18% |
| Christian | 7/10 | 6445 days | 16% |
| Nick | 10/10 | 6447 days | 18% |
| Terri Scott | 7/10 | 6465 days | 16% |
| Alan Bellerby | 10/10 | 6615 days | 18% |
| Robert | 4/10 | 6621 days | 7% |
| Elise | 10/10 | 6621 days | 18% |
| Fung | 8/10 | 6621 days | 17% |
| Peter Aston | 9/10 | 6621 days | 17% |
| Tony Wicks | 8/10 | 6626 days | 17% |
| Sue | 8/10 | 6633 days | 17% |
| Carla | 9/10 | 6641 days | 17% |
| Melissa Steedman | 9/10 | 6668 days | 17% |
| Vanessa Brennan | 7/10 | 6668 days | 16% |
| Tim | 9/10 | 6669 days | 17% |
| Mary | 10/10 | 6719 days | 18% |
| Agnes | 9/10 | 6935 days | 17% |
| Cohen | 9/10 | 6955 days | 17% |
| John | 8/10 | 6959 days | 17% |
| SueLinsk | 9/10 | 6959 days | 17% |
| Frauke | 7/10 | 7001 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
-3.34% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 70 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 | -3.29% |
| 198 | -3.30% |
| 199 | -3.32% |
| 200 | -3.34% |
| 201 | -3.35% |
| 202 | -3.37% |
| 203 | -3.39% |
| … | … |
Balancing Adjustment
1.61% 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
88%
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.