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
89.31%
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 | 1939 days | 100% |
| Amanda Walden | 10/10 | 2822 days | 64% |
| Monique Pos | 9/10 | 2912 days | 60% |
| Alison Egan-Jones | 9/10 | 2942 days | 58% |
| Sylvain Schiber | 9/10 | 2942 days | 58% |
| Sylvain Chanton | 10/10 | 2947 days | 59% |
| Julian Gury | 8/10 | 2955 days | 57% |
| R. Damen | 9/10 | 2973 days | 57% |
| Michelle Smit | 10/10 | 3034 days | 55% |
| Gesa Roemer | 8/10 | 3163 days | 49% |
| Anais Roux | 10/10 | 3168 days | 50% |
| Luca Staudt | 8/10 | 3187 days | 48% |
| Florian Bisault | 7/10 | 3188 days | 45% |
| Anna Jungclaus | 9/10 | 3195 days | 48% |
| Signe Broedbaek | 7/10 | 3197 days | 45% |
| Petra Fragner | 10/10 | 3203 days | 48% |
| Koehler Ute | 10/10 | 3216 days | 48% |
| Niclas Ullno | 8/10 | 3218 days | 47% |
| Tamara | 7/10 | 3219 days | 44% |
| Chloe Guerillot | 9/10 | 3229 days | 47% |
| Luisa and Hannes | 9/10 | 3242 days | 46% |
| elena salimzhanova | 10/10 | 3247 days | 46% |
| Jakub Trojanek | 8/10 | 3257 days | 45% |
| Malina | 10/10 | 3263 days | 46% |
| Emma Keegan | 7/10 | 3522 days | 33% |
| Emilie Normand | 7/10 | 3592 days | 30% |
| Christopher Buch Madsen | 8/10 | 3913 days | 19% |
| Phil Bromby | 9/10 | 3915 days | 19% |
| Tobias Thull | 7/10 | 3921 days | 17% |
| Rita Hochstiasser | 8/10 | 3943 days | 17% |
| Nelle Dutilleur | 10/10 | 3964 days | 17% |
| Mathias Butterlin | 8/10 | 3964 days | 17% |
| Daryl | 8/10 | 3972 days | 16% |
| Bert Pubeg | 9/10 | 4038 days | 14% |
| Alex | 8/10 | 4342 days | 1% |
| Lucie | 9/10 | 4378 days | 0% |
| Henzen | 9/10 | 4382 days | 21% |
| Roy Barton | 9/10 | 4645 days | 21% |
| Brian Livesey | 9/10 | 4653 days | 21% |
| Merlyn | 8/10 | 4661 days | 20% |
| Beyeler | 10/10 | 4665 days | 21% |
| Ralf Glaser | 7/10 | 4665 days | 19% |
| Suzanne van Kol | 8/10 | 4670 days | 20% |
| kiwifrenchy | 10/10 | 4677 days | 21% |
| _mel_ | 9/10 | 4708 days | 21% |
| C | 10/10 | 4708 days | 21% |
| Sarah and Soren | 10/10 | 4745 days | 21% |
| Erik Folkersen | 10/10 | 4753 days | 21% |
| Rudlinger | 10/10 | 4756 days | 21% |
| GenH | 10/10 | 4983 days | 21% |
| R Tearle | 10/10 | 4992 days | 21% |
| Franzi & Tobi | 10/10 | 4994 days | 21% |
| Nathalie | 10/10 | 4998 days | 21% |
| Ven | 9/10 | 5000 days | 21% |
| Jerven and Kim | 10/10 | 5007 days | 21% |
| Sarah Luijckx | 1/10 | 5009 days | 8% |
| Alan Jeffery | 7/10 | 5010 days | 19% |
| Birgette Weiner | 9/10 | 5028 days | 21% |
| Tim Van Nispen | 9/10 | 5030 days | 21% |
| Bottcher | 10/10 | 5030 days | 21% |
| Sue & Graham Mullin | 10/10 | 5037 days | 21% |
| John Simpson | 9/10 | 5039 days | 21% |
| Karen Phillips | 9/10 | 5039 days | 21% |
| Michelle Booty | 8/10 | 5041 days | 20% |
| Nadia Husain | 7/10 | 5042 days | 19% |
| Dietmar Gans | 10/10 | 5348 days | 21% |
| Matt Roper | 10/10 | 5370 days | 21% |
| Chris Glasg | 10/10 | 5387 days | 21% |
| Jamie Hallifax | 9/10 | 5398 days | 21% |
| Paul Ritchie | 10/10 | 5402 days | 21% |
| Gerry Donoghue | 10/10 | 5421 days | 21% |
| Yvonne German | 9/10 | 5424 days | 21% |
| DebbieM | 5/10 | 5438 days | 16% |
| mj111 | 10/10 | 5438 days | 21% |
| Susann Koschmeider | 10/10 | 5473 days | 21% |
| X Otte | 10/10 | 5477 days | 21% |
| Hans Hoff | 10/10 | 5477 days | 21% |
| Solveig Mosinski | 10/10 | 5481 days | 21% |
| Val and Barnie Weir | 10/10 | 5492 days | 21% |
| Wim Put | 9/10 | 5495 days | 21% |
| discerner | 10/10 | 5499 days | 21% |
| Phillip Reade | 10/10 | 5499 days | 21% |
| Tim Beuzeval | 9/10 | 5499 days | 21% |
| barp | 9/10 | 5530 days | 21% |
| Becky Fairweather | 10/10 | 5683 days | 21% |
| David | 10/10 | 5713 days | 21% |
| martinat | 10/10 | 5713 days | 21% |
| Mike | 9/10 | 5723 days | 21% |
| MichaelS1 | 9/10 | 5729 days | 21% |
| StefanieGermany | 9/10 | 5731 days | 21% |
| Veronika | 9/10 | 5733 days | 21% |
| Ralph Boese | 7/10 | 5733 days | 19% |
| ToyalFrance | 9/10 | 5733 days | 21% |
| ReneeA | 9/10 | 5761 days | 21% |
| Lorna | 8/10 | 5763 days | 20% |
| Bruce | 10/10 | 5764 days | 21% |
| Sandra | 10/10 | 5771 days | 21% |
| Heidi | 7/10 | 5778 days | 19% |
| Philipp | 9/10 | 5778 days | 21% |
| Simon | 9/10 | 5779 days | 21% |
| Kathryn | 8/10 | 5781 days | 20% |
| Barbara | 9/10 | 5786 days | 21% |
| Joachim | 10/10 | 5786 days | 21% |
| Ans | 7/10 | 5787 days | 19% |
| Minder | 10/10 | 5788 days | 21% |
| Evi | 7/10 | 5819 days | 19% |
| Ann Maree | 9/10 | 5822 days | 21% |
| Trine | 9/10 | 5832 days | 21% |
| Carina Korn | 10/10 | 5929 days | 21% |
| Christian | 7/10 | 5929 days | 19% |
| Nick | 10/10 | 5932 days | 21% |
| Terri Scott | 7/10 | 5949 days | 19% |
| Alan Bellerby | 10/10 | 6099 days | 21% |
| Robert | 4/10 | 6105 days | 14% |
| Elise | 10/10 | 6105 days | 21% |
| Fung | 8/10 | 6105 days | 20% |
| Peter Aston | 9/10 | 6105 days | 21% |
| Tony Wicks | 8/10 | 6110 days | 20% |
| Sue | 8/10 | 6117 days | 20% |
| Carla | 9/10 | 6125 days | 21% |
| Melissa Steedman | 9/10 | 6152 days | 21% |
| Vanessa Brennan | 7/10 | 6152 days | 19% |
| Tim | 9/10 | 6153 days | 21% |
| Mary | 10/10 | 6203 days | 21% |
| Agnes | 9/10 | 6419 days | 21% |
| Cohen | 9/10 | 6439 days | 21% |
| John | 8/10 | 6443 days | 20% |
| SueLinsk | 9/10 | 6443 days | 21% |
| Frauke | 7/10 | 6485 days | 19% |
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 43 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
1.77% 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.