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
89.48%
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 | 2476 days | 100% |
| Amanda Walden | 10/10 | 3359 days | 48% |
| Monique Pos | 9/10 | 3449 days | 42% |
| Alison Egan-Jones | 9/10 | 3479 days | 40% |
| Sylvain Schiber | 9/10 | 3479 days | 40% |
| Sylvain Chanton | 10/10 | 3484 days | 41% |
| Julian Gury | 8/10 | 3492 days | 39% |
| R. Damen | 9/10 | 3510 days | 39% |
| Michelle Smit | 10/10 | 3571 days | 35% |
| Gesa Roemer | 8/10 | 3700 days | 27% |
| Anais Roux | 10/10 | 3705 days | 28% |
| Luca Staudt | 8/10 | 3724 days | 26% |
| Florian Bisault | 7/10 | 3725 days | 24% |
| Anna Jungclaus | 9/10 | 3732 days | 26% |
| Signe Broedbaek | 7/10 | 3734 days | 23% |
| Petra Fragner | 10/10 | 3740 days | 25% |
| Koehler Ute | 10/10 | 3753 days | 25% |
| Niclas Ullno | 8/10 | 3755 days | 24% |
| Tamara | 7/10 | 3756 days | 22% |
| Chloe Guerillot | 9/10 | 3766 days | 24% |
| Luisa and Hannes | 9/10 | 3779 days | 23% |
| elena salimzhanova | 10/10 | 3784 days | 23% |
| Jakub Trojanek | 8/10 | 3794 days | 22% |
| Malina | 10/10 | 3800 days | 22% |
| Emma Keegan | 7/10 | 4059 days | 5% |
| Emilie Normand | 7/10 | 4129 days | 2% |
| Christopher Buch Madsen | 8/10 | 4450 days | 17% |
| Phil Bromby | 9/10 | 4452 days | 18% |
| Tobias Thull | 7/10 | 4458 days | 16% |
| Rita Hochstiasser | 8/10 | 4480 days | 17% |
| Nelle Dutilleur | 10/10 | 4501 days | 18% |
| Mathias Butterlin | 8/10 | 4501 days | 17% |
| Daryl | 8/10 | 4509 days | 17% |
| Bert Pubeg | 9/10 | 4575 days | 18% |
| Alex | 8/10 | 4879 days | 17% |
| Lucie | 9/10 | 4915 days | 18% |
| Henzen | 9/10 | 4919 days | 18% |
| Roy Barton | 9/10 | 5182 days | 18% |
| Brian Livesey | 9/10 | 5190 days | 18% |
| Merlyn | 8/10 | 5198 days | 17% |
| Beyeler | 10/10 | 5202 days | 18% |
| Ralf Glaser | 7/10 | 5202 days | 16% |
| Suzanne van Kol | 8/10 | 5207 days | 17% |
| kiwifrenchy | 10/10 | 5214 days | 18% |
| _mel_ | 9/10 | 5245 days | 18% |
| C | 10/10 | 5245 days | 18% |
| Sarah and Soren | 10/10 | 5282 days | 18% |
| Erik Folkersen | 10/10 | 5290 days | 18% |
| Rudlinger | 10/10 | 5293 days | 18% |
| GenH | 10/10 | 5520 days | 18% |
| R Tearle | 10/10 | 5529 days | 18% |
| Franzi & Tobi | 10/10 | 5531 days | 18% |
| Nathalie | 10/10 | 5535 days | 18% |
| Ven | 9/10 | 5537 days | 18% |
| Jerven and Kim | 10/10 | 5544 days | 18% |
| Sarah Luijckx | 1/10 | 5546 days | 0% |
| Alan Jeffery | 7/10 | 5547 days | 16% |
| Birgette Weiner | 9/10 | 5565 days | 18% |
| Tim Van Nispen | 9/10 | 5567 days | 18% |
| Bottcher | 10/10 | 5567 days | 18% |
| Sue & Graham Mullin | 10/10 | 5574 days | 18% |
| John Simpson | 9/10 | 5576 days | 18% |
| Karen Phillips | 9/10 | 5576 days | 18% |
| Michelle Booty | 8/10 | 5578 days | 17% |
| Nadia Husain | 7/10 | 5579 days | 16% |
| Dietmar Gans | 10/10 | 5885 days | 18% |
| Matt Roper | 10/10 | 5907 days | 18% |
| Chris Glasg | 10/10 | 5924 days | 18% |
| Jamie Hallifax | 9/10 | 5935 days | 18% |
| Paul Ritchie | 10/10 | 5939 days | 18% |
| Gerry Donoghue | 10/10 | 5958 days | 18% |
| Yvonne German | 9/10 | 5961 days | 18% |
| DebbieM | 5/10 | 5975 days | 11% |
| mj111 | 10/10 | 5975 days | 18% |
| Susann Koschmeider | 10/10 | 6010 days | 18% |
| X Otte | 10/10 | 6014 days | 18% |
| Hans Hoff | 10/10 | 6014 days | 18% |
| Solveig Mosinski | 10/10 | 6018 days | 18% |
| Val and Barnie Weir | 10/10 | 6029 days | 18% |
| Wim Put | 9/10 | 6032 days | 18% |
| discerner | 10/10 | 6036 days | 18% |
| Phillip Reade | 10/10 | 6036 days | 18% |
| Tim Beuzeval | 9/10 | 6036 days | 18% |
| barp | 9/10 | 6067 days | 18% |
| Becky Fairweather | 10/10 | 6220 days | 18% |
| David | 10/10 | 6250 days | 18% |
| martinat | 10/10 | 6250 days | 18% |
| Mike | 9/10 | 6259 days | 18% |
| MichaelS1 | 9/10 | 6266 days | 18% |
| StefanieGermany | 9/10 | 6267 days | 18% |
| Veronika | 9/10 | 6269 days | 18% |
| Ralph Boese | 7/10 | 6270 days | 16% |
| ToyalFrance | 9/10 | 6270 days | 18% |
| ReneeA | 9/10 | 6298 days | 18% |
| Lorna | 8/10 | 6299 days | 17% |
| Bruce | 10/10 | 6300 days | 18% |
| Sandra | 10/10 | 6307 days | 18% |
| Heidi | 7/10 | 6314 days | 16% |
| Philipp | 9/10 | 6315 days | 18% |
| Simon | 9/10 | 6316 days | 18% |
| Kathryn | 8/10 | 6317 days | 17% |
| Barbara | 9/10 | 6322 days | 18% |
| Joachim | 10/10 | 6322 days | 18% |
| Ans | 7/10 | 6323 days | 16% |
| Minder | 10/10 | 6324 days | 18% |
| Evi | 7/10 | 6355 days | 16% |
| Ann Maree | 9/10 | 6358 days | 18% |
| Trine | 9/10 | 6368 days | 18% |
| Carina Korn | 10/10 | 6466 days | 18% |
| Christian | 7/10 | 6466 days | 16% |
| Nick | 10/10 | 6468 days | 18% |
| Terri Scott | 7/10 | 6486 days | 16% |
| Alan Bellerby | 10/10 | 6636 days | 18% |
| Robert | 4/10 | 6642 days | 7% |
| Elise | 10/10 | 6642 days | 18% |
| Fung | 8/10 | 6642 days | 17% |
| Peter Aston | 9/10 | 6642 days | 18% |
| Tony Wicks | 8/10 | 6647 days | 17% |
| Sue | 8/10 | 6654 days | 17% |
| Carla | 9/10 | 6662 days | 18% |
| Melissa Steedman | 9/10 | 6689 days | 18% |
| Vanessa Brennan | 7/10 | 6689 days | 16% |
| Tim | 9/10 | 6690 days | 18% |
| Mary | 10/10 | 6740 days | 18% |
| Agnes | 9/10 | 6956 days | 18% |
| Cohen | 9/10 | 6976 days | 18% |
| John | 8/10 | 6980 days | 17% |
| SueLinsk | 9/10 | 6980 days | 18% |
| Frauke | 7/10 | 7022 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
-2.87% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 88 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 | -2.82% |
| 198 | -2.84% |
| 199 | -2.85% |
| 200 | -2.87% |
| 201 | -2.88% |
| 202 | -2.90% |
| 203 | -2.91% |
| … | … |
Balancing Adjustment
1.52% 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.