Kia ora, 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
89.69%
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 | 2332 days | 100% |
| Amanda Walden | 10/10 | 3215 days | 57% |
| Monique Pos | 9/10 | 3305 days | 52% |
| Alison Egan-Jones | 9/10 | 3335 days | 50% |
| Sylvain Schiber | 9/10 | 3336 days | 50% |
| Sylvain Chanton | 10/10 | 3341 days | 50% |
| Julian Gury | 8/10 | 3349 days | 49% |
| R. Damen | 9/10 | 3366 days | 49% |
| Michelle Smit | 10/10 | 3427 days | 46% |
| Gesa Roemer | 8/10 | 3557 days | 39% |
| Anais Roux | 10/10 | 3562 days | 40% |
| Luca Staudt | 8/10 | 3581 days | 38% |
| Florian Bisault | 7/10 | 3582 days | 36% |
| Anna Jungclaus | 9/10 | 3589 days | 38% |
| Signe Broedbaek | 7/10 | 3591 days | 35% |
| Petra Fragner | 10/10 | 3597 days | 38% |
| Koehler Ute | 10/10 | 3609 days | 37% |
| Niclas Ullno | 8/10 | 3612 days | 36% |
| Tamara | 7/10 | 3613 days | 34% |
| Chloe Guerillot | 9/10 | 3623 days | 36% |
| Luisa and Hannes | 9/10 | 3636 days | 36% |
| elena salimzhanova | 10/10 | 3640 days | 36% |
| Jakub Trojanek | 8/10 | 3651 days | 34% |
| Malina | 10/10 | 3657 days | 35% |
| Emma Keegan | 7/10 | 3915 days | 21% |
| Emilie Normand | 7/10 | 3986 days | 17% |
| Christopher Buch Madsen | 8/10 | 4307 days | 3% |
| Phil Bromby | 9/10 | 4309 days | 3% |
| Tobias Thull | 7/10 | 4315 days | 2% |
| Rita Hochstiasser | 8/10 | 4337 days | 1% |
| Nelle Dutilleur | 10/10 | 4358 days | 0% |
| Mathias Butterlin | 8/10 | 4358 days | 0% |
| Daryl | 8/10 | 4366 days | 0% |
| Bert Pubeg | 9/10 | 4432 days | 24% |
| Alex | 8/10 | 4736 days | 24% |
| Lucie | 9/10 | 4772 days | 24% |
| Henzen | 9/10 | 4776 days | 24% |
| Roy Barton | 9/10 | 5039 days | 24% |
| Brian Livesey | 9/10 | 5047 days | 24% |
| Merlyn | 8/10 | 5055 days | 24% |
| Beyeler | 10/10 | 5059 days | 24% |
| Ralf Glaser | 7/10 | 5059 days | 23% |
| Suzanne van Kol | 8/10 | 5064 days | 24% |
| kiwifrenchy | 10/10 | 5071 days | 24% |
| _mel_ | 9/10 | 5102 days | 24% |
| C | 10/10 | 5102 days | 24% |
| Sarah and Soren | 10/10 | 5139 days | 24% |
| Erik Folkersen | 10/10 | 5147 days | 24% |
| Rudlinger | 10/10 | 5150 days | 24% |
| GenH | 10/10 | 5377 days | 24% |
| R Tearle | 10/10 | 5386 days | 24% |
| Franzi & Tobi | 10/10 | 5388 days | 24% |
| Nathalie | 10/10 | 5392 days | 24% |
| Ven | 9/10 | 5394 days | 24% |
| Jerven and Kim | 10/10 | 5401 days | 24% |
| Sarah Luijckx | 1/10 | 5403 days | 10% |
| Alan Jeffery | 7/10 | 5404 days | 23% |
| Birgette Weiner | 9/10 | 5422 days | 24% |
| Tim Van Nispen | 9/10 | 5424 days | 24% |
| Bottcher | 10/10 | 5424 days | 24% |
| Sue & Graham Mullin | 10/10 | 5431 days | 24% |
| John Simpson | 9/10 | 5433 days | 24% |
| Karen Phillips | 9/10 | 5433 days | 24% |
| Michelle Booty | 8/10 | 5435 days | 24% |
| Nadia Husain | 7/10 | 5436 days | 23% |
| Dietmar Gans | 10/10 | 5742 days | 24% |
| Matt Roper | 10/10 | 5764 days | 24% |
| Chris Glasg | 10/10 | 5781 days | 24% |
| Jamie Hallifax | 9/10 | 5792 days | 24% |
| Paul Ritchie | 10/10 | 5796 days | 24% |
| Gerry Donoghue | 10/10 | 5815 days | 24% |
| Yvonne German | 9/10 | 5818 days | 24% |
| DebbieM | 5/10 | 5832 days | 18% |
| mj111 | 10/10 | 5832 days | 24% |
| Susann Koschmeider | 10/10 | 5867 days | 24% |
| X Otte | 10/10 | 5871 days | 24% |
| Hans Hoff | 10/10 | 5871 days | 24% |
| Solveig Mosinski | 10/10 | 5875 days | 24% |
| Val and Barnie Weir | 10/10 | 5886 days | 24% |
| Wim Put | 9/10 | 5889 days | 24% |
| discerner | 10/10 | 5893 days | 24% |
| Phillip Reade | 10/10 | 5893 days | 24% |
| Tim Beuzeval | 9/10 | 5893 days | 24% |
| barp | 9/10 | 5924 days | 24% |
| Becky Fairweather | 10/10 | 6077 days | 24% |
| David | 10/10 | 6107 days | 24% |
| martinat | 10/10 | 6107 days | 24% |
| Mike | 9/10 | 6116 days | 24% |
| MichaelS1 | 9/10 | 6123 days | 24% |
| StefanieGermany | 9/10 | 6124 days | 24% |
| Veronika | 9/10 | 6126 days | 24% |
| Ralph Boese | 7/10 | 6127 days | 23% |
| ToyalFrance | 9/10 | 6127 days | 24% |
| ReneeA | 9/10 | 6155 days | 24% |
| Lorna | 8/10 | 6156 days | 24% |
| Bruce | 10/10 | 6157 days | 24% |
| Sandra | 10/10 | 6164 days | 24% |
| Heidi | 7/10 | 6171 days | 23% |
| Philipp | 9/10 | 6171 days | 24% |
| Simon | 9/10 | 6173 days | 24% |
| Kathryn | 8/10 | 6174 days | 24% |
| Barbara | 9/10 | 6179 days | 24% |
| Joachim | 10/10 | 6179 days | 24% |
| Ans | 7/10 | 6180 days | 23% |
| Minder | 10/10 | 6181 days | 24% |
| Evi | 7/10 | 6212 days | 23% |
| Ann Maree | 9/10 | 6215 days | 24% |
| Trine | 9/10 | 6225 days | 24% |
| Carina Korn | 10/10 | 6323 days | 24% |
| Christian | 7/10 | 6323 days | 23% |
| Nick | 10/10 | 6325 days | 24% |
| Terri Scott | 7/10 | 6342 days | 23% |
| Alan Bellerby | 10/10 | 6493 days | 24% |
| Robert | 4/10 | 6499 days | 16% |
| Elise | 10/10 | 6499 days | 24% |
| Fung | 8/10 | 6499 days | 24% |
| Peter Aston | 9/10 | 6499 days | 24% |
| Tony Wicks | 8/10 | 6504 days | 24% |
| Sue | 8/10 | 6511 days | 24% |
| Carla | 9/10 | 6519 days | 24% |
| Melissa Steedman | 9/10 | 6546 days | 24% |
| Vanessa Brennan | 7/10 | 6546 days | 23% |
| Tim | 9/10 | 6547 days | 24% |
| Mary | 10/10 | 6597 days | 24% |
| Agnes | 9/10 | 6813 days | 24% |
| Cohen | 9/10 | 6833 days | 24% |
| John | 8/10 | 6837 days | 24% |
| SueLinsk | 9/10 | 6837 days | 24% |
| Frauke | 7/10 | 6879 days | 23% |
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
-4.04% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 41 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 | -3.98% |
| 198 | -4.00% |
| 199 | -4.02% |
| 200 | -4.04% |
| 201 | -4.06% |
| 202 | -4.08% |
| 203 | -4.10% |
| … | … |
Balancing Adjustment
1.70% 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.