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
89.28%
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 | 1917 days | 100% |
| Amanda Walden | 10/10 | 2800 days | 64% |
| Monique Pos | 9/10 | 2890 days | 60% |
| Alison Egan-Jones | 9/10 | 2920 days | 58% |
| Sylvain Schiber | 9/10 | 2920 days | 58% |
| Sylvain Chanton | 10/10 | 2925 days | 59% |
| Julian Gury | 8/10 | 2933 days | 57% |
| R. Damen | 9/10 | 2951 days | 57% |
| Michelle Smit | 10/10 | 3012 days | 55% |
| Gesa Roemer | 8/10 | 3141 days | 49% |
| Anais Roux | 10/10 | 3146 days | 50% |
| Luca Staudt | 8/10 | 3165 days | 48% |
| Florian Bisault | 7/10 | 3166 days | 45% |
| Anna Jungclaus | 9/10 | 3173 days | 48% |
| Signe Broedbaek | 7/10 | 3175 days | 45% |
| Petra Fragner | 10/10 | 3181 days | 48% |
| Koehler Ute | 10/10 | 3194 days | 48% |
| Niclas Ullno | 8/10 | 3196 days | 47% |
| Tamara | 7/10 | 3197 days | 44% |
| Chloe Guerillot | 9/10 | 3207 days | 47% |
| Luisa and Hannes | 9/10 | 3220 days | 46% |
| elena salimzhanova | 10/10 | 3225 days | 46% |
| Jakub Trojanek | 8/10 | 3235 days | 45% |
| Malina | 10/10 | 3241 days | 46% |
| Emma Keegan | 7/10 | 3500 days | 33% |
| Emilie Normand | 7/10 | 3570 days | 30% |
| Christopher Buch Madsen | 8/10 | 3891 days | 19% |
| Phil Bromby | 9/10 | 3893 days | 19% |
| Tobias Thull | 7/10 | 3899 days | 18% |
| Rita Hochstiasser | 8/10 | 3921 days | 18% |
| Nelle Dutilleur | 10/10 | 3942 days | 17% |
| Mathias Butterlin | 8/10 | 3942 days | 17% |
| Daryl | 8/10 | 3950 days | 16% |
| Bert Pubeg | 9/10 | 4016 days | 14% |
| Alex | 8/10 | 4320 days | 2% |
| Lucie | 9/10 | 4356 days | 0% |
| Henzen | 9/10 | 4360 days | 0% |
| Roy Barton | 9/10 | 4623 days | 20% |
| Brian Livesey | 9/10 | 4631 days | 20% |
| Merlyn | 8/10 | 4639 days | 20% |
| Beyeler | 10/10 | 4643 days | 20% |
| Ralf Glaser | 7/10 | 4643 days | 19% |
| Suzanne van Kol | 8/10 | 4648 days | 20% |
| kiwifrenchy | 10/10 | 4655 days | 20% |
| _mel_ | 9/10 | 4686 days | 20% |
| C | 10/10 | 4686 days | 20% |
| Sarah and Soren | 10/10 | 4723 days | 20% |
| Erik Folkersen | 10/10 | 4731 days | 20% |
| Rudlinger | 10/10 | 4734 days | 20% |
| GenH | 10/10 | 4961 days | 20% |
| R Tearle | 10/10 | 4970 days | 20% |
| Franzi & Tobi | 10/10 | 4972 days | 20% |
| Nathalie | 10/10 | 4976 days | 20% |
| Ven | 9/10 | 4978 days | 20% |
| Jerven and Kim | 10/10 | 4985 days | 20% |
| Sarah Luijckx | 1/10 | 4987 days | 8% |
| Alan Jeffery | 7/10 | 4988 days | 19% |
| Birgette Weiner | 9/10 | 5006 days | 20% |
| Tim Van Nispen | 9/10 | 5008 days | 20% |
| Bottcher | 10/10 | 5008 days | 20% |
| Sue & Graham Mullin | 10/10 | 5015 days | 20% |
| John Simpson | 9/10 | 5017 days | 20% |
| Karen Phillips | 9/10 | 5017 days | 20% |
| Michelle Booty | 8/10 | 5019 days | 20% |
| Nadia Husain | 7/10 | 5020 days | 19% |
| Dietmar Gans | 10/10 | 5326 days | 20% |
| Matt Roper | 10/10 | 5348 days | 20% |
| Chris Glasg | 10/10 | 5365 days | 20% |
| Jamie Hallifax | 9/10 | 5376 days | 20% |
| Paul Ritchie | 10/10 | 5380 days | 20% |
| Gerry Donoghue | 10/10 | 5399 days | 20% |
| Yvonne German | 9/10 | 5402 days | 20% |
| DebbieM | 5/10 | 5416 days | 15% |
| mj111 | 10/10 | 5416 days | 20% |
| Susann Koschmeider | 10/10 | 5451 days | 20% |
| X Otte | 10/10 | 5455 days | 20% |
| Hans Hoff | 10/10 | 5455 days | 20% |
| Solveig Mosinski | 10/10 | 5459 days | 20% |
| Val and Barnie Weir | 10/10 | 5470 days | 20% |
| Wim Put | 9/10 | 5473 days | 20% |
| discerner | 10/10 | 5477 days | 20% |
| Phillip Reade | 10/10 | 5477 days | 20% |
| Tim Beuzeval | 9/10 | 5477 days | 20% |
| barp | 9/10 | 5508 days | 20% |
| Becky Fairweather | 10/10 | 5661 days | 20% |
| David | 10/10 | 5691 days | 20% |
| martinat | 10/10 | 5691 days | 20% |
| Mike | 9/10 | 5700 days | 20% |
| MichaelS1 | 9/10 | 5707 days | 20% |
| StefanieGermany | 9/10 | 5708 days | 20% |
| Veronika | 9/10 | 5710 days | 20% |
| Ralph Boese | 7/10 | 5711 days | 19% |
| ToyalFrance | 9/10 | 5711 days | 20% |
| ReneeA | 9/10 | 5739 days | 20% |
| Lorna | 8/10 | 5740 days | 20% |
| Bruce | 10/10 | 5741 days | 20% |
| Sandra | 10/10 | 5748 days | 20% |
| Heidi | 7/10 | 5755 days | 19% |
| Philipp | 9/10 | 5755 days | 20% |
| Simon | 9/10 | 5757 days | 20% |
| Kathryn | 8/10 | 5758 days | 20% |
| Barbara | 9/10 | 5763 days | 20% |
| Joachim | 10/10 | 5763 days | 20% |
| Ans | 7/10 | 5764 days | 19% |
| Minder | 10/10 | 5765 days | 20% |
| Evi | 7/10 | 5796 days | 19% |
| Ann Maree | 9/10 | 5799 days | 20% |
| Trine | 9/10 | 5809 days | 20% |
| Carina Korn | 10/10 | 5907 days | 20% |
| Christian | 7/10 | 5907 days | 19% |
| Nick | 10/10 | 5909 days | 20% |
| Terri Scott | 7/10 | 5926 days | 19% |
| Alan Bellerby | 10/10 | 6077 days | 20% |
| Robert | 4/10 | 6083 days | 13% |
| Elise | 10/10 | 6083 days | 20% |
| Fung | 8/10 | 6083 days | 20% |
| Peter Aston | 9/10 | 6083 days | 20% |
| Tony Wicks | 8/10 | 6088 days | 20% |
| Sue | 8/10 | 6095 days | 20% |
| Carla | 9/10 | 6103 days | 20% |
| Melissa Steedman | 9/10 | 6130 days | 20% |
| Vanessa Brennan | 7/10 | 6130 days | 19% |
| Tim | 9/10 | 6131 days | 20% |
| Mary | 10/10 | 6181 days | 20% |
| Agnes | 9/10 | 6397 days | 20% |
| Cohen | 9/10 | 6417 days | 20% |
| John | 8/10 | 6421 days | 20% |
| SueLinsk | 9/10 | 6421 days | 20% |
| Frauke | 7/10 | 6463 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
-3.84% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 51 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 | -3.78% |
| 198 | -3.80% |
| 199 | -3.82% |
| 200 | -3.84% |
| 201 | -3.86% |
| 202 | -3.88% |
| 203 | -3.90% |
| … | … |
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.