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
89.45%
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 | 2413 days | 100% |
| Amanda Walden | 10/10 | 3296 days | 50% |
| Monique Pos | 9/10 | 3386 days | 44% |
| Alison Egan-Jones | 9/10 | 3416 days | 42% |
| Sylvain Schiber | 9/10 | 3417 days | 42% |
| Sylvain Chanton | 10/10 | 3422 days | 43% |
| Julian Gury | 8/10 | 3430 days | 41% |
| R. Damen | 9/10 | 3447 days | 41% |
| Michelle Smit | 10/10 | 3508 days | 38% |
| Gesa Roemer | 8/10 | 3638 days | 30% |
| Anais Roux | 10/10 | 3643 days | 30% |
| Luca Staudt | 8/10 | 3662 days | 28% |
| Florian Bisault | 7/10 | 3663 days | 26% |
| Anna Jungclaus | 9/10 | 3670 days | 28% |
| Signe Broedbaek | 7/10 | 3672 days | 26% |
| Petra Fragner | 10/10 | 3678 days | 28% |
| Koehler Ute | 10/10 | 3690 days | 27% |
| Niclas Ullno | 8/10 | 3693 days | 26% |
| Tamara | 7/10 | 3694 days | 24% |
| Chloe Guerillot | 9/10 | 3704 days | 26% |
| Luisa and Hannes | 9/10 | 3717 days | 26% |
| elena salimzhanova | 10/10 | 3721 days | 26% |
| Jakub Trojanek | 8/10 | 3732 days | 24% |
| Malina | 10/10 | 3738 days | 25% |
| Emma Keegan | 7/10 | 3996 days | 9% |
| Emilie Normand | 7/10 | 4067 days | 5% |
| Christopher Buch Madsen | 8/10 | 4388 days | 17% |
| Phil Bromby | 9/10 | 4390 days | 17% |
| Tobias Thull | 7/10 | 4396 days | 15% |
| Rita Hochstiasser | 8/10 | 4418 days | 17% |
| Nelle Dutilleur | 10/10 | 4439 days | 17% |
| Mathias Butterlin | 8/10 | 4439 days | 17% |
| Daryl | 8/10 | 4447 days | 17% |
| Bert Pubeg | 9/10 | 4513 days | 17% |
| Alex | 8/10 | 4817 days | 17% |
| Lucie | 9/10 | 4853 days | 17% |
| Henzen | 9/10 | 4857 days | 17% |
| Roy Barton | 9/10 | 5120 days | 17% |
| Brian Livesey | 9/10 | 5128 days | 17% |
| Merlyn | 8/10 | 5136 days | 17% |
| Beyeler | 10/10 | 5140 days | 17% |
| Ralf Glaser | 7/10 | 5140 days | 15% |
| Suzanne van Kol | 8/10 | 5145 days | 17% |
| kiwifrenchy | 10/10 | 5152 days | 17% |
| _mel_ | 9/10 | 5183 days | 17% |
| C | 10/10 | 5183 days | 17% |
| Sarah and Soren | 10/10 | 5220 days | 17% |
| Erik Folkersen | 10/10 | 5228 days | 17% |
| Rudlinger | 10/10 | 5231 days | 17% |
| GenH | 10/10 | 5458 days | 17% |
| R Tearle | 10/10 | 5467 days | 17% |
| Franzi & Tobi | 10/10 | 5469 days | 17% |
| Nathalie | 10/10 | 5473 days | 17% |
| Ven | 9/10 | 5475 days | 17% |
| Jerven and Kim | 10/10 | 5482 days | 17% |
| Sarah Luijckx | 1/10 | 5484 days | 0% |
| Alan Jeffery | 7/10 | 5485 days | 15% |
| Birgette Weiner | 9/10 | 5503 days | 17% |
| Tim Van Nispen | 9/10 | 5505 days | 17% |
| Bottcher | 10/10 | 5505 days | 17% |
| Sue & Graham Mullin | 10/10 | 5512 days | 17% |
| John Simpson | 9/10 | 5514 days | 17% |
| Karen Phillips | 9/10 | 5514 days | 17% |
| Michelle Booty | 8/10 | 5516 days | 17% |
| Nadia Husain | 7/10 | 5517 days | 15% |
| Dietmar Gans | 10/10 | 5823 days | 17% |
| Matt Roper | 10/10 | 5845 days | 17% |
| Chris Glasg | 10/10 | 5862 days | 17% |
| Jamie Hallifax | 9/10 | 5873 days | 17% |
| Paul Ritchie | 10/10 | 5877 days | 17% |
| Gerry Donoghue | 10/10 | 5896 days | 17% |
| Yvonne German | 9/10 | 5899 days | 17% |
| DebbieM | 5/10 | 5913 days | 10% |
| mj111 | 10/10 | 5913 days | 17% |
| Susann Koschmeider | 10/10 | 5948 days | 17% |
| X Otte | 10/10 | 5952 days | 17% |
| Hans Hoff | 10/10 | 5952 days | 17% |
| Solveig Mosinski | 10/10 | 5956 days | 17% |
| Val and Barnie Weir | 10/10 | 5967 days | 17% |
| Wim Put | 9/10 | 5970 days | 17% |
| discerner | 10/10 | 5974 days | 17% |
| Phillip Reade | 10/10 | 5974 days | 17% |
| Tim Beuzeval | 9/10 | 5974 days | 17% |
| barp | 9/10 | 6005 days | 17% |
| Becky Fairweather | 10/10 | 6158 days | 17% |
| David | 10/10 | 6188 days | 17% |
| martinat | 10/10 | 6188 days | 17% |
| Mike | 9/10 | 6197 days | 17% |
| MichaelS1 | 9/10 | 6204 days | 17% |
| StefanieGermany | 9/10 | 6205 days | 17% |
| Veronika | 9/10 | 6207 days | 17% |
| Ralph Boese | 7/10 | 6208 days | 15% |
| ToyalFrance | 9/10 | 6208 days | 17% |
| ReneeA | 9/10 | 6236 days | 17% |
| Lorna | 8/10 | 6237 days | 17% |
| Bruce | 10/10 | 6238 days | 17% |
| Sandra | 10/10 | 6245 days | 17% |
| Heidi | 7/10 | 6252 days | 15% |
| Philipp | 9/10 | 6252 days | 17% |
| Simon | 9/10 | 6254 days | 17% |
| Kathryn | 8/10 | 6255 days | 17% |
| Barbara | 9/10 | 6260 days | 17% |
| Joachim | 10/10 | 6260 days | 17% |
| Ans | 7/10 | 6261 days | 15% |
| Minder | 10/10 | 6262 days | 17% |
| Evi | 7/10 | 6293 days | 15% |
| Ann Maree | 9/10 | 6296 days | 17% |
| Trine | 9/10 | 6306 days | 17% |
| Carina Korn | 10/10 | 6403 days | 17% |
| Christian | 7/10 | 6403 days | 15% |
| Nick | 10/10 | 6406 days | 17% |
| Terri Scott | 7/10 | 6423 days | 15% |
| Alan Bellerby | 10/10 | 6574 days | 17% |
| Robert | 4/10 | 6580 days | 7% |
| Elise | 10/10 | 6580 days | 17% |
| Fung | 8/10 | 6580 days | 17% |
| Peter Aston | 9/10 | 6580 days | 17% |
| Tony Wicks | 8/10 | 6585 days | 17% |
| Sue | 8/10 | 6592 days | 17% |
| Carla | 9/10 | 6600 days | 17% |
| Melissa Steedman | 9/10 | 6627 days | 17% |
| Vanessa Brennan | 7/10 | 6627 days | 15% |
| Tim | 9/10 | 6628 days | 17% |
| Mary | 10/10 | 6678 days | 17% |
| Agnes | 9/10 | 6894 days | 17% |
| Cohen | 9/10 | 6914 days | 17% |
| John | 8/10 | 6918 days | 17% |
| SueLinsk | 9/10 | 6918 days | 17% |
| Frauke | 7/10 | 6960 days | 15% |
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
-4.03% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 57 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 | -3.97% |
| 198 | -3.99% |
| 199 | -4.01% |
| 200 | -4.03% |
| 201 | -4.05% |
| 202 | -4.07% |
| 203 | -4.09% |
| … | … |
Balancing Adjustment
1.74% 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
87%
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.