Hey, 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 Tranz Alpine Train.
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.
Tranz Alpine Train
Valid Reviews
68 Valid Reviews
The Tranz Alpine Train experience has a total of 68 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 68 valid reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 11 |
|
16% |
| 9/10 | 10 |
|
15% |
| 8/10 | 28 |
|
41% |
| 7/10 | 8 |
|
12% |
| 6/10 | 3 |
|
4% |
| 5/10 | 4 |
|
6% |
| 4/10 | 3 |
|
4% |
| 3/10 | 0 |
|
0% |
| 2/10 | 1 |
|
1% |
| 1/10 | 0 |
|
0% |
78.24% Average
The raw data average (mean) for all the Tranz Alpine Train valid reviews is 78.24% and is based on 68 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
63 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 68 valid reviews, the experience has 63 face-to-face reviews collected during interviews by our team.
Below is the distribution of ratings for the 63 face-to-face reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 9 |
|
14% |
| 9/10 | 10 |
|
16% |
| 8/10 | 27 |
|
43% |
| 7/10 | 7 |
|
11% |
| 6/10 | 3 |
|
5% |
| 5/10 | 4 |
|
6% |
| 4/10 | 2 |
|
3% |
| 3/10 | 0 |
|
0% |
| 2/10 | 1 |
|
2% |
| 1/10 | 0 |
|
0% |
78.25% Average
The raw data average (mean) for all the Tranz Alpine Train face-to-face reviews is 78.25% and is based on 63 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.
Weighted Average
77.94%
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 |
|---|---|---|---|
| Steve Sopota | 4/10 | 2423 days | 100% |
| Fanny Hacquart | 5/10 | 2906 days | 88% |
| Jill Stebbing | 7/10 | 3174 days | 88% |
| Petru | 10/10 | 3225 days | 90% |
| Amadeus van Schie | 8/10 | 3257 days | 86% |
| Esther Itier | 7/10 | 3544 days | 60% |
| Thomas Neron | 7/10 | 3544 days | 60% |
| Clare Lambley | 8/10 | 3625 days | 57% |
| Eric Lambley | 5/10 | 3626 days | 44% |
| Ngaire Davies | 7/10 | 3957 days | 30% |
| Cindy Parson | 10/10 | 4249 days | 9% |
| Petra Blumberg | 8/10 | 4286 days | 6% |
| David and Sally Wallis | 8/10 | 4361 days | 0% |
| Steve and Therese Dunne | 8/10 | 4382 days | 38% |
| Michael & Janet | 9/10 | 4655 days | 39% |
| Michael & Rosemary Smith | 8/10 | 4660 days | 38% |
| Mike & April Prince | 8/10 | 4687 days | 38% |
| Warwick Ravell | 9/10 | 4753 days | 39% |
| Alita Smith | 2/10 | 4983 days | 17% |
| Graham Greentree | 9/10 | 4988 days | 39% |
| Bill Cutler | 9/10 | 5001 days | 39% |
| Steve Pearce | 8/10 | 5015 days | 38% |
| Jenny & Barry Sleeman | 8/10 | 5032 days | 38% |
| David Glover | 10/10 | 5033 days | 39% |
| Grada Anderson | 10/10 | 5039 days | 39% |
| Rosey834 | 8/10 | 5070 days | 38% |
| Kerry Wood | 10/10 | 5378 days | 39% |
| David Valentine | 4/10 | 5398 days | 25% |
| Sandra B | 8/10 | 5403 days | 38% |
| Gary Judd | 8/10 | 5403 days | 38% |
| carmenk | 8/10 | 5452 days | 38% |
| Wolfgang Dittrich | 8/10 | 5476 days | 38% |
| Simon Bartholomew | 6/10 | 5478 days | 33% |
| Sarah Smith | 7/10 | 5492 days | 36% |
| regw | 10/10 | 5586 days | 39% |
| nickm | 10/10 | 5665 days | 39% |
| Amy_B | 8/10 | 5698 days | 38% |
| Roy | 9/10 | 5715 days | 39% |
| Richard | 8/10 | 5720 days | 38% |
| Elise | 8/10 | 5761 days | 38% |
| Jordi | 8/10 | 5831 days | 38% |
| purplekat99 | 10/10 | 5831 days | 39% |
| David | 9/10 | 5836 days | 39% |
| Fothergill | 8/10 | 5917 days | 38% |
| Peddy | 7/10 | 5945 days | 36% |
| Ulrike | 10/10 | 5978 days | 39% |
| Helen | 6/10 | 6060 days | 33% |
| Anke | 5/10 | 6060 days | 29% |
| Olga | 4/10 | 6076 days | 25% |
| Aiko Nishimura | 8/10 | 6097 days | 38% |
| Kerstin Brantryd | 5/10 | 6097 days | 29% |
| Marian Mckinney | 9/10 | 6103 days | 39% |
| Greg & Lynette | 9/10 | 6103 days | 39% |
| Sally and David Wallis | 8/10 | 6110 days | 38% |
| Lisa Tame | 7/10 | 6111 days | 36% |
| Katharina | 8/10 | 6122 days | 38% |
| Jim Curley | 6/10 | 6122 days | 33% |
| Kilsby | 10/10 | 6138 days | 39% |
| Lyn Saxon | 8/10 | 6195 days | 38% |
| Phillipa | 9/10 | 6420 days | 39% |
| Sue | 8/10 | 6428 days | 38% |
| Michael | 7/10 | 6428 days | 36% |
| Simon | 10/10 | 6440 days | 39% |
| Fred | 8/10 | 6440 days | 38% |
| Cat | 9/10 | 6440 days | 39% |
| Sandra | 8/10 | 6447 days | 38% |
| Pam Rose | 8/10 | 6450 days | 38% |
| Kerry | 8/10 | 6485 days | 38% |
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 Tranz Alpine Train experience has plenty of reviews and does not meet the criteria for any adjustment.
Recent Reviews Adjustment
-4.03% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 44 days. However the Tranz Alpine Train 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 Tranz Alpine Train experience has been adjusted for 200 days. Adjustments are according to the following table.
| Days | Adjustment |
|---|---|
| … | … |
| 197 | -3.97% |
| 198 | -3.99% |
| 199 | -4.01% |
| 200 | -4.03% |
| 201 | -4.05% |
| 202 | -4.07% |
| 203 | -4.09% |
| … | … |
Balancing Adjustment
5.09% 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
79%
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.