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
89.54%
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 | 2580 days | 100% |
| Amanda Walden | 10/10 | 3463 days | 47% |
| Monique Pos | 9/10 | 3553 days | 41% |
| Alison Egan-Jones | 9/10 | 3583 days | 39% |
| Sylvain Schiber | 9/10 | 3583 days | 39% |
| Sylvain Chanton | 10/10 | 3588 days | 39% |
| Julian Gury | 8/10 | 3596 days | 38% |
| R. Damen | 9/10 | 3614 days | 37% |
| Michelle Smit | 10/10 | 3675 days | 34% |
| Gesa Roemer | 8/10 | 3804 days | 26% |
| Anais Roux | 10/10 | 3809 days | 26% |
| Luca Staudt | 8/10 | 3828 days | 24% |
| Florian Bisault | 7/10 | 3829 days | 23% |
| Anna Jungclaus | 9/10 | 3836 days | 24% |
| Signe Broedbaek | 7/10 | 3838 days | 22% |
| Petra Fragner | 10/10 | 3844 days | 24% |
| Koehler Ute | 10/10 | 3857 days | 23% |
| Niclas Ullno | 8/10 | 3859 days | 22% |
| Tamara | 7/10 | 3860 days | 21% |
| Chloe Guerillot | 9/10 | 3870 days | 22% |
| Luisa and Hannes | 9/10 | 3883 days | 21% |
| elena salimzhanova | 10/10 | 3888 days | 21% |
| Jakub Trojanek | 8/10 | 3898 days | 20% |
| Malina | 10/10 | 3904 days | 20% |
| Emma Keegan | 7/10 | 4163 days | 4% |
| Emilie Normand | 7/10 | 4233 days | 0% |
| Christopher Buch Madsen | 8/10 | 4554 days | 22% |
| Phil Bromby | 9/10 | 4556 days | 22% |
| Tobias Thull | 7/10 | 4562 days | 20% |
| Rita Hochstiasser | 8/10 | 4584 days | 22% |
| Nelle Dutilleur | 10/10 | 4605 days | 22% |
| Mathias Butterlin | 8/10 | 4605 days | 22% |
| Daryl | 8/10 | 4613 days | 22% |
| Bert Pubeg | 9/10 | 4679 days | 22% |
| Alex | 8/10 | 4983 days | 22% |
| Lucie | 9/10 | 5019 days | 22% |
| Henzen | 9/10 | 5023 days | 22% |
| Roy Barton | 9/10 | 5286 days | 22% |
| Brian Livesey | 9/10 | 5294 days | 22% |
| Merlyn | 8/10 | 5302 days | 22% |
| Beyeler | 10/10 | 5306 days | 22% |
| Ralf Glaser | 7/10 | 5306 days | 20% |
| Suzanne van Kol | 8/10 | 5311 days | 22% |
| kiwifrenchy | 10/10 | 5318 days | 22% |
| _mel_ | 9/10 | 5349 days | 22% |
| C | 10/10 | 5349 days | 22% |
| Sarah and Soren | 10/10 | 5386 days | 22% |
| Erik Folkersen | 10/10 | 5394 days | 22% |
| Rudlinger | 10/10 | 5397 days | 22% |
| GenH | 10/10 | 5624 days | 22% |
| R Tearle | 10/10 | 5633 days | 22% |
| Franzi & Tobi | 10/10 | 5635 days | 22% |
| Nathalie | 10/10 | 5639 days | 22% |
| Ven | 9/10 | 5641 days | 22% |
| Jerven and Kim | 10/10 | 5648 days | 22% |
| Sarah Luijckx | 1/10 | 5650 days | 4% |
| Alan Jeffery | 7/10 | 5651 days | 20% |
| Birgette Weiner | 9/10 | 5669 days | 22% |
| Tim Van Nispen | 9/10 | 5671 days | 22% |
| Bottcher | 10/10 | 5671 days | 22% |
| Sue & Graham Mullin | 10/10 | 5678 days | 22% |
| John Simpson | 9/10 | 5680 days | 22% |
| Karen Phillips | 9/10 | 5680 days | 22% |
| Michelle Booty | 8/10 | 5682 days | 22% |
| Nadia Husain | 7/10 | 5683 days | 20% |
| Dietmar Gans | 10/10 | 5989 days | 22% |
| Matt Roper | 10/10 | 6011 days | 22% |
| Chris Glasg | 10/10 | 6028 days | 22% |
| Jamie Hallifax | 9/10 | 6039 days | 22% |
| Paul Ritchie | 10/10 | 6043 days | 22% |
| Gerry Donoghue | 10/10 | 6062 days | 22% |
| Yvonne German | 9/10 | 6065 days | 22% |
| DebbieM | 5/10 | 6079 days | 15% |
| mj111 | 10/10 | 6079 days | 22% |
| Susann Koschmeider | 10/10 | 6114 days | 22% |
| X Otte | 10/10 | 6118 days | 22% |
| Hans Hoff | 10/10 | 6118 days | 22% |
| Solveig Mosinski | 10/10 | 6122 days | 22% |
| Val and Barnie Weir | 10/10 | 6133 days | 22% |
| Wim Put | 9/10 | 6136 days | 22% |
| discerner | 10/10 | 6140 days | 22% |
| Phillip Reade | 10/10 | 6140 days | 22% |
| Tim Beuzeval | 9/10 | 6140 days | 22% |
| barp | 9/10 | 6171 days | 22% |
| Becky Fairweather | 10/10 | 6324 days | 22% |
| David | 10/10 | 6354 days | 22% |
| martinat | 10/10 | 6354 days | 22% |
| Mike | 9/10 | 6364 days | 22% |
| MichaelS1 | 9/10 | 6370 days | 22% |
| StefanieGermany | 9/10 | 6372 days | 22% |
| Veronika | 9/10 | 6373 days | 22% |
| Ralph Boese | 7/10 | 6374 days | 20% |
| ToyalFrance | 9/10 | 6374 days | 22% |
| ReneeA | 9/10 | 6402 days | 22% |
| Lorna | 8/10 | 6403 days | 22% |
| Bruce | 10/10 | 6405 days | 22% |
| Sandra | 10/10 | 6411 days | 22% |
| Heidi | 7/10 | 6419 days | 20% |
| Philipp | 9/10 | 6419 days | 22% |
| Simon | 9/10 | 6420 days | 22% |
| Kathryn | 8/10 | 6421 days | 22% |
| Barbara | 9/10 | 6426 days | 22% |
| Joachim | 10/10 | 6426 days | 22% |
| Ans | 7/10 | 6427 days | 20% |
| Minder | 10/10 | 6428 days | 22% |
| Evi | 7/10 | 6459 days | 20% |
| Ann Maree | 9/10 | 6462 days | 22% |
| Trine | 9/10 | 6472 days | 22% |
| Carina Korn | 10/10 | 6570 days | 22% |
| Christian | 7/10 | 6570 days | 20% |
| Nick | 10/10 | 6573 days | 22% |
| Terri Scott | 7/10 | 6590 days | 20% |
| Alan Bellerby | 10/10 | 6740 days | 22% |
| Robert | 4/10 | 6746 days | 12% |
| Elise | 10/10 | 6746 days | 22% |
| Fung | 8/10 | 6746 days | 22% |
| Peter Aston | 9/10 | 6746 days | 22% |
| Tony Wicks | 8/10 | 6751 days | 22% |
| Sue | 8/10 | 6758 days | 22% |
| Carla | 9/10 | 6766 days | 22% |
| Melissa Steedman | 9/10 | 6793 days | 22% |
| Vanessa Brennan | 7/10 | 6793 days | 20% |
| Tim | 9/10 | 6794 days | 22% |
| Mary | 10/10 | 6844 days | 22% |
| Agnes | 9/10 | 7060 days | 22% |
| Cohen | 9/10 | 7080 days | 22% |
| John | 8/10 | 7084 days | 22% |
| SueLinsk | 9/10 | 7084 days | 22% |
| Frauke | 7/10 | 7126 days | 20% |
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
-2.45% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 105 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 | -2.42% |
| 198 | -2.43% |
| 199 | -2.44% |
| 200 | -2.45% |
| 201 | -2.47% |
| 202 | -2.48% |
| 203 | -2.49% |
| … | … |
Balancing Adjustment
1.44% 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.