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 | 2330 days | 100% |
| Amanda Walden | 10/10 | 3213 days | 57% |
| Monique Pos | 9/10 | 3303 days | 52% |
| Alison Egan-Jones | 9/10 | 3333 days | 50% |
| Sylvain Schiber | 9/10 | 3334 days | 50% |
| Sylvain Chanton | 10/10 | 3339 days | 50% |
| Julian Gury | 8/10 | 3347 days | 49% |
| R. Damen | 9/10 | 3364 days | 49% |
| Michelle Smit | 10/10 | 3425 days | 46% |
| Gesa Roemer | 8/10 | 3555 days | 39% |
| Anais Roux | 10/10 | 3560 days | 40% |
| Luca Staudt | 8/10 | 3579 days | 38% |
| Florian Bisault | 7/10 | 3580 days | 36% |
| Anna Jungclaus | 9/10 | 3587 days | 38% |
| Signe Broedbaek | 7/10 | 3589 days | 35% |
| Petra Fragner | 10/10 | 3595 days | 38% |
| Koehler Ute | 10/10 | 3607 days | 37% |
| Niclas Ullno | 8/10 | 3610 days | 36% |
| Tamara | 7/10 | 3611 days | 34% |
| Chloe Guerillot | 9/10 | 3621 days | 36% |
| Luisa and Hannes | 9/10 | 3634 days | 36% |
| elena salimzhanova | 10/10 | 3638 days | 36% |
| Jakub Trojanek | 8/10 | 3649 days | 34% |
| Malina | 10/10 | 3655 days | 35% |
| Emma Keegan | 7/10 | 3913 days | 21% |
| Emilie Normand | 7/10 | 3984 days | 17% |
| Christopher Buch Madsen | 8/10 | 4305 days | 3% |
| Phil Bromby | 9/10 | 4307 days | 3% |
| Tobias Thull | 7/10 | 4313 days | 2% |
| Rita Hochstiasser | 8/10 | 4335 days | 1% |
| Nelle Dutilleur | 10/10 | 4356 days | 0% |
| Mathias Butterlin | 8/10 | 4356 days | 0% |
| Daryl | 8/10 | 4364 days | 0% |
| Bert Pubeg | 9/10 | 4430 days | 24% |
| Alex | 8/10 | 4734 days | 24% |
| Lucie | 9/10 | 4770 days | 24% |
| Henzen | 9/10 | 4774 days | 24% |
| Roy Barton | 9/10 | 5037 days | 24% |
| Brian Livesey | 9/10 | 5045 days | 24% |
| Merlyn | 8/10 | 5053 days | 24% |
| Beyeler | 10/10 | 5057 days | 24% |
| Ralf Glaser | 7/10 | 5057 days | 23% |
| Suzanne van Kol | 8/10 | 5062 days | 24% |
| kiwifrenchy | 10/10 | 5069 days | 24% |
| _mel_ | 9/10 | 5100 days | 24% |
| C | 10/10 | 5100 days | 24% |
| Sarah and Soren | 10/10 | 5137 days | 24% |
| Erik Folkersen | 10/10 | 5145 days | 24% |
| Rudlinger | 10/10 | 5148 days | 24% |
| GenH | 10/10 | 5375 days | 24% |
| R Tearle | 10/10 | 5384 days | 24% |
| Franzi & Tobi | 10/10 | 5386 days | 24% |
| Nathalie | 10/10 | 5390 days | 24% |
| Ven | 9/10 | 5392 days | 24% |
| Jerven and Kim | 10/10 | 5399 days | 24% |
| Sarah Luijckx | 1/10 | 5401 days | 9% |
| Alan Jeffery | 7/10 | 5402 days | 23% |
| Birgette Weiner | 9/10 | 5420 days | 24% |
| Tim Van Nispen | 9/10 | 5422 days | 24% |
| Bottcher | 10/10 | 5422 days | 24% |
| Sue & Graham Mullin | 10/10 | 5429 days | 24% |
| John Simpson | 9/10 | 5431 days | 24% |
| Karen Phillips | 9/10 | 5431 days | 24% |
| Michelle Booty | 8/10 | 5433 days | 24% |
| Nadia Husain | 7/10 | 5434 days | 23% |
| Dietmar Gans | 10/10 | 5740 days | 24% |
| Matt Roper | 10/10 | 5762 days | 24% |
| Chris Glasg | 10/10 | 5779 days | 24% |
| Jamie Hallifax | 9/10 | 5790 days | 24% |
| Paul Ritchie | 10/10 | 5794 days | 24% |
| Gerry Donoghue | 10/10 | 5813 days | 24% |
| Yvonne German | 9/10 | 5816 days | 24% |
| DebbieM | 5/10 | 5830 days | 18% |
| mj111 | 10/10 | 5830 days | 24% |
| Susann Koschmeider | 10/10 | 5865 days | 24% |
| X Otte | 10/10 | 5869 days | 24% |
| Hans Hoff | 10/10 | 5869 days | 24% |
| Solveig Mosinski | 10/10 | 5873 days | 24% |
| Val and Barnie Weir | 10/10 | 5884 days | 24% |
| Wim Put | 9/10 | 5887 days | 24% |
| discerner | 10/10 | 5891 days | 24% |
| Phillip Reade | 10/10 | 5891 days | 24% |
| Tim Beuzeval | 9/10 | 5891 days | 24% |
| barp | 9/10 | 5922 days | 24% |
| Becky Fairweather | 10/10 | 6075 days | 24% |
| David | 10/10 | 6105 days | 24% |
| martinat | 10/10 | 6105 days | 24% |
| Mike | 9/10 | 6114 days | 24% |
| MichaelS1 | 9/10 | 6121 days | 24% |
| StefanieGermany | 9/10 | 6122 days | 24% |
| Veronika | 9/10 | 6124 days | 24% |
| Ralph Boese | 7/10 | 6125 days | 23% |
| ToyalFrance | 9/10 | 6125 days | 24% |
| ReneeA | 9/10 | 6153 days | 24% |
| Lorna | 8/10 | 6154 days | 24% |
| Bruce | 10/10 | 6155 days | 24% |
| Sandra | 10/10 | 6162 days | 24% |
| Heidi | 7/10 | 6169 days | 23% |
| Philipp | 9/10 | 6169 days | 24% |
| Simon | 9/10 | 6171 days | 24% |
| Kathryn | 8/10 | 6172 days | 24% |
| Barbara | 9/10 | 6177 days | 24% |
| Joachim | 10/10 | 6177 days | 24% |
| Ans | 7/10 | 6178 days | 23% |
| Minder | 10/10 | 6179 days | 24% |
| Evi | 7/10 | 6210 days | 23% |
| Ann Maree | 9/10 | 6213 days | 24% |
| Trine | 9/10 | 6223 days | 24% |
| Carina Korn | 10/10 | 6321 days | 24% |
| Christian | 7/10 | 6321 days | 23% |
| Nick | 10/10 | 6323 days | 24% |
| Terri Scott | 7/10 | 6340 days | 23% |
| Alan Bellerby | 10/10 | 6491 days | 24% |
| Robert | 4/10 | 6497 days | 16% |
| Elise | 10/10 | 6497 days | 24% |
| Fung | 8/10 | 6497 days | 24% |
| Peter Aston | 9/10 | 6497 days | 24% |
| Tony Wicks | 8/10 | 6502 days | 24% |
| Sue | 8/10 | 6509 days | 24% |
| Carla | 9/10 | 6517 days | 24% |
| Melissa Steedman | 9/10 | 6544 days | 24% |
| Vanessa Brennan | 7/10 | 6544 days | 23% |
| Tim | 9/10 | 6545 days | 24% |
| Mary | 10/10 | 6595 days | 24% |
| Agnes | 9/10 | 6811 days | 24% |
| Cohen | 9/10 | 6831 days | 24% |
| John | 8/10 | 6835 days | 24% |
| SueLinsk | 9/10 | 6835 days | 24% |
| Frauke | 7/10 | 6877 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
-4.05% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 42 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 | -3.99% |
| 198 | -4.01% |
| 199 | -4.03% |
| 200 | -4.05% |
| 201 | -4.07% |
| 202 | -4.09% |
| 203 | -4.11% |
| … | … |
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.