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 Waitomo Caveworld.
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.
Waitomo Caveworld
Valid Reviews
74 Valid Reviews
The Waitomo Caveworld experience has a total of 74 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 74 valid reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 15 |
|
20% |
| 9/10 | 18 |
|
24% |
| 8/10 | 20 |
|
27% |
| 7/10 | 10 |
|
14% |
| 6/10 | 8 |
|
11% |
| 5/10 | 2 |
|
3% |
| 4/10 | 0 |
|
0% |
| 3/10 | 0 |
|
0% |
| 2/10 | 1 |
|
1% |
| 1/10 | 0 |
|
0% |
81.35% Average
The raw data average (mean) for all the Waitomo Caveworld valid reviews is 81.35% and is based on 74 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
68 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 74 valid reviews, the experience has 68 face-to-face reviews collected during interviews by our team.
Below is the distribution of ratings for the 68 face-to-face reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 15 |
|
22% |
| 9/10 | 16 |
|
24% |
| 8/10 | 19 |
|
28% |
| 7/10 | 9 |
|
13% |
| 6/10 | 7 |
|
10% |
| 5/10 | 2 |
|
3% |
| 4/10 | 0 |
|
0% |
| 3/10 | 0 |
|
0% |
| 2/10 | 0 |
|
0% |
| 1/10 | 0 |
|
0% |
82.50% Average
The raw data average (mean) for all the Waitomo Caveworld face-to-face reviews is 82.50% and is based on 68 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.
Weighted Average
82.42%
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 |
|---|---|---|---|
| Cassandra Geyer | 9/10 | 3157 days | 100% |
| Mijke Boesten | 8/10 | 3212 days | 93% |
| Anders Hauke | 8/10 | 3213 days | 93% |
| Lengxi | 8/10 | 3213 days | 93% |
| Arvid Hellquist | 9/10 | 3585 days | 57% |
| Steven Lotrian | 9/10 | 3932 days | 22% |
| Alex Artigues | 10/10 | 3980 days | 17% |
| Serge Garcin | 10/10 | 3980 days | 17% |
| Tourist101 | 2/10 | 4434 days | 0% |
| kayburns | 9/10 | 4495 days | 28% |
| Alison Rosser | 7/10 | 4671 days | 25% |
| Helen & Laurence | 8/10 | 4746 days | 27% |
| Kris Gijbels | 8/10 | 4992 days | 27% |
| Mike | 6/10 | 5030 days | 21% |
| Stefan Morris | 8/10 | 5033 days | 27% |
| Jessie Currie | 7/10 | 5033 days | 25% |
| Barry | 9/10 | 5035 days | 28% |
| Melanie Armbruster | 6/10 | 5038 days | 21% |
| Stefanie Halbrock | 5/10 | 5038 days | 16% |
| Jim Thomsen | 8/10 | 5039 days | 27% |
| Kate Thomsen | 8/10 | 5039 days | 27% |
| Denecke Thorsten | 7/10 | 5388 days | 25% |
| M and H Lunn | 8/10 | 5388 days | 27% |
| Henrik Plichta | 9/10 | 5388 days | 28% |
| Michael | 10/10 | 5389 days | 28% |
| San Ahuia | 5/10 | 5398 days | 16% |
| Amer | 10/10 | 5404 days | 28% |
| Coby Aalbrecht | 7/10 | 5406 days | 25% |
| Andreas Sterki | 8/10 | 5477 days | 27% |
| X Otte | 7/10 | 5477 days | 25% |
| Hansjoerg Ehrmann | 9/10 | 5480 days | 28% |
| Sophie Keate | 8/10 | 5597 days | 27% |
| Catherine Smiles | 10/10 | 5627 days | 28% |
| Martina | 6/10 | 5713 days | 21% |
| IanM | 8/10 | 5714 days | 27% |
| MarielR | 9/10 | 5731 days | 28% |
| Joel | 9/10 | 5733 days | 28% |
| Brigette Guikens | 10/10 | 5734 days | 28% |
| Keith | 7/10 | 5737 days | 25% |
| JuliaG1 | 8/10 | 5746 days | 27% |
| DavidMurray | 8/10 | 5747 days | 27% |
| RosC | 6/10 | 5748 days | 21% |
| AndrewF78 | 9/10 | 5749 days | 28% |
| EmmaB1 | 9/10 | 5759 days | 28% |
| ClaudiaK | 10/10 | 5762 days | 28% |
| ArnarF | 9/10 | 5772 days | 28% |
| SonjaS | 10/10 | 5772 days | 28% |
| Burkhalter | 9/10 | 5785 days | 28% |
| Rene | 7/10 | 5786 days | 25% |
| Paula | 8/10 | 5839 days | 27% |
| Teresa | 10/10 | 5845 days | 28% |
| Kay | 10/10 | 5893 days | 28% |
| Jimmy | 9/10 | 5911 days | 28% |
| Anna | 10/10 | 5911 days | 28% |
| sabine | 10/10 | 5911 days | 28% |
| Elisabeth | 10/10 | 5920 days | 28% |
| Terneal King | 7/10 | 5952 days | 25% |
| Helen | 6/10 | 5962 days | 21% |
| Nicnac | 8/10 | 6079 days | 27% |
| Mark | 10/10 | 6083 days | 28% |
| Joanne M | 7/10 | 6089 days | 25% |
| Anna | 10/10 | 6090 days | 28% |
| Leila | 9/10 | 6093 days | 28% |
| Adam Richards | 8/10 | 6093 days | 27% |
| Lena1 | 9/10 | 6114 days | 28% |
| Stephanie | 9/10 | 6125 days | 28% |
| Hanna | 6/10 | 6126 days | 21% |
| Maree | 8/10 | 6126 days | 27% |
| Orlaith | 9/10 | 6126 days | 28% |
| Lisa | 8/10 | 6126 days | 27% |
| Stephanie Jones | 6/10 | 6153 days | 21% |
| Paula Smith | 7/10 | 6156 days | 25% |
| Bridgy | 8/10 | 6403 days | 27% |
| JanKovar | 6/10 | 6431 days | 21% |
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 Waitomo Caveworld 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 Waitomo Caveworld 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 Waitomo Caveworld 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
3.47% 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
82%
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.