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 | 2149 days | 100% |
| Amanda Walden | 10/10 | 3032 days | 58% |
| Monique Pos | 9/10 | 3122 days | 53% |
| Alison Egan-Jones | 9/10 | 3152 days | 52% |
| Sylvain Schiber | 9/10 | 3152 days | 52% |
| Sylvain Chanton | 10/10 | 3157 days | 52% |
| Julian Gury | 8/10 | 3165 days | 50% |
| R. Damen | 9/10 | 3183 days | 50% |
| Michelle Smit | 10/10 | 3244 days | 48% |
| Gesa Roemer | 8/10 | 3373 days | 41% |
| Anais Roux | 10/10 | 3378 days | 41% |
| Luca Staudt | 8/10 | 3397 days | 40% |
| Florian Bisault | 7/10 | 3398 days | 37% |
| Anna Jungclaus | 9/10 | 3405 days | 40% |
| Signe Broedbaek | 7/10 | 3407 days | 37% |
| Petra Fragner | 10/10 | 3413 days | 40% |
| Koehler Ute | 10/10 | 3426 days | 39% |
| Niclas Ullno | 8/10 | 3428 days | 38% |
| Tamara | 7/10 | 3429 days | 36% |
| Chloe Guerillot | 9/10 | 3439 days | 38% |
| Luisa and Hannes | 9/10 | 3452 days | 38% |
| elena salimzhanova | 10/10 | 3457 days | 38% |
| Jakub Trojanek | 8/10 | 3467 days | 36% |
| Malina | 10/10 | 3473 days | 37% |
| Emma Keegan | 7/10 | 3732 days | 22% |
| Emilie Normand | 7/10 | 3802 days | 19% |
| Christopher Buch Madsen | 8/10 | 4123 days | 6% |
| Phil Bromby | 9/10 | 4125 days | 6% |
| Tobias Thull | 7/10 | 4131 days | 5% |
| Rita Hochstiasser | 8/10 | 4153 days | 4% |
| Nelle Dutilleur | 10/10 | 4174 days | 4% |
| Mathias Butterlin | 8/10 | 4174 days | 3% |
| Daryl | 8/10 | 4182 days | 3% |
| Bert Pubeg | 9/10 | 4248 days | 0% |
| Alex | 8/10 | 4552 days | 18% |
| Lucie | 9/10 | 4588 days | 18% |
| Henzen | 9/10 | 4592 days | 18% |
| Roy Barton | 9/10 | 4855 days | 18% |
| Brian Livesey | 9/10 | 4863 days | 18% |
| Merlyn | 8/10 | 4871 days | 18% |
| Beyeler | 10/10 | 4875 days | 18% |
| Ralf Glaser | 7/10 | 4875 days | 16% |
| Suzanne van Kol | 8/10 | 4880 days | 18% |
| kiwifrenchy | 10/10 | 4887 days | 18% |
| _mel_ | 9/10 | 4918 days | 18% |
| C | 10/10 | 4918 days | 18% |
| Sarah and Soren | 10/10 | 4955 days | 18% |
| Erik Folkersen | 10/10 | 4963 days | 18% |
| Rudlinger | 10/10 | 4966 days | 18% |
| GenH | 10/10 | 5193 days | 18% |
| R Tearle | 10/10 | 5202 days | 18% |
| Franzi & Tobi | 10/10 | 5204 days | 18% |
| Nathalie | 10/10 | 5208 days | 18% |
| Ven | 9/10 | 5210 days | 18% |
| Jerven and Kim | 10/10 | 5217 days | 18% |
| Sarah Luijckx | 1/10 | 5219 days | 4% |
| Alan Jeffery | 7/10 | 5220 days | 16% |
| Birgette Weiner | 9/10 | 5238 days | 18% |
| Tim Van Nispen | 9/10 | 5240 days | 18% |
| Bottcher | 10/10 | 5240 days | 18% |
| Sue & Graham Mullin | 10/10 | 5247 days | 18% |
| John Simpson | 9/10 | 5249 days | 18% |
| Karen Phillips | 9/10 | 5249 days | 18% |
| Michelle Booty | 8/10 | 5251 days | 18% |
| Nadia Husain | 7/10 | 5252 days | 16% |
| Dietmar Gans | 10/10 | 5558 days | 18% |
| Matt Roper | 10/10 | 5580 days | 18% |
| Chris Glasg | 10/10 | 5597 days | 18% |
| Jamie Hallifax | 9/10 | 5608 days | 18% |
| Paul Ritchie | 10/10 | 5612 days | 18% |
| Gerry Donoghue | 10/10 | 5631 days | 18% |
| Yvonne German | 9/10 | 5634 days | 18% |
| DebbieM | 5/10 | 5648 days | 12% |
| mj111 | 10/10 | 5648 days | 18% |
| Susann Koschmeider | 10/10 | 5683 days | 18% |
| X Otte | 10/10 | 5687 days | 18% |
| Hans Hoff | 10/10 | 5687 days | 18% |
| Solveig Mosinski | 10/10 | 5691 days | 18% |
| Val and Barnie Weir | 10/10 | 5702 days | 18% |
| Wim Put | 9/10 | 5705 days | 18% |
| discerner | 10/10 | 5709 days | 18% |
| Phillip Reade | 10/10 | 5709 days | 18% |
| Tim Beuzeval | 9/10 | 5709 days | 18% |
| barp | 9/10 | 5740 days | 18% |
| Becky Fairweather | 10/10 | 5893 days | 18% |
| David | 10/10 | 5923 days | 18% |
| martinat | 10/10 | 5923 days | 18% |
| Mike | 9/10 | 5933 days | 18% |
| MichaelS1 | 9/10 | 5939 days | 18% |
| StefanieGermany | 9/10 | 5941 days | 18% |
| Veronika | 9/10 | 5942 days | 18% |
| Ralph Boese | 7/10 | 5943 days | 16% |
| ToyalFrance | 9/10 | 5943 days | 18% |
| ReneeA | 9/10 | 5971 days | 18% |
| Lorna | 8/10 | 5973 days | 18% |
| Bruce | 10/10 | 5974 days | 18% |
| Sandra | 10/10 | 5980 days | 18% |
| Heidi | 7/10 | 5988 days | 16% |
| Philipp | 9/10 | 5988 days | 18% |
| Simon | 9/10 | 5989 days | 18% |
| Kathryn | 8/10 | 5990 days | 18% |
| Barbara | 9/10 | 5995 days | 18% |
| Joachim | 10/10 | 5995 days | 18% |
| Ans | 7/10 | 5996 days | 16% |
| Minder | 10/10 | 5997 days | 18% |
| Evi | 7/10 | 6029 days | 16% |
| Ann Maree | 9/10 | 6031 days | 18% |
| Trine | 9/10 | 6042 days | 18% |
| Carina Korn | 10/10 | 6139 days | 18% |
| Christian | 7/10 | 6139 days | 16% |
| Nick | 10/10 | 6142 days | 18% |
| Terri Scott | 7/10 | 6159 days | 16% |
| Alan Bellerby | 10/10 | 6309 days | 18% |
| Robert | 4/10 | 6315 days | 10% |
| Elise | 10/10 | 6315 days | 18% |
| Fung | 8/10 | 6315 days | 18% |
| Peter Aston | 9/10 | 6315 days | 18% |
| Tony Wicks | 8/10 | 6320 days | 18% |
| Sue | 8/10 | 6327 days | 18% |
| Carla | 9/10 | 6335 days | 18% |
| Melissa Steedman | 9/10 | 6362 days | 18% |
| Vanessa Brennan | 7/10 | 6362 days | 16% |
| Tim | 9/10 | 6363 days | 18% |
| Mary | 10/10 | 6413 days | 18% |
| Agnes | 9/10 | 6629 days | 18% |
| Cohen | 9/10 | 6649 days | 18% |
| John | 8/10 | 6653 days | 18% |
| SueLinsk | 9/10 | 6653 days | 18% |
| Frauke | 7/10 | 6695 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
-2.16% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 118 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 | -2.13% |
| 198 | -2.14% |
| 199 | -2.15% |
| 200 | -2.16% |
| 201 | -2.17% |
| 202 | -2.19% |
| 203 | -2.20% |
| … | … |
Balancing Adjustment
1.41% 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.