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 Kelly Tarlton's Antarctic Encounter and Underwater World.
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.
Kelly Tarlton's Antarctic Encounter and Underwater World
Valid Reviews
44 Valid Reviews
The Kelly Tarlton's Antarctic Encounter and Underwater World experience has a total of 45 reviews. There are 44 valid reviews that are included when calculating the ranking score and 1 invalid review 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 44 valid reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 4 |
|
9% |
| 9/10 | 9 |
|
20% |
| 8/10 | 7 |
|
16% |
| 7/10 | 8 |
|
18% |
| 6/10 | 4 |
|
9% |
| 5/10 | 5 |
|
11% |
| 4/10 | 4 |
|
9% |
| 3/10 | 3 |
|
7% |
| 2/10 | 0 |
|
0% |
| 1/10 | 0 |
|
0% |
69.77% Average
The raw data average (mean) for all the Kelly Tarlton's Antarctic Encounter and Underwater World valid reviews is 69.77% and is based on 44 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
35 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 44 valid reviews, the experience has 35 face-to-face reviews collected during interviews by our team.
Below is the distribution of ratings for the 35 face-to-face reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 2 |
|
6% |
| 9/10 | 9 |
|
26% |
| 8/10 | 6 |
|
17% |
| 7/10 | 7 |
|
20% |
| 6/10 | 3 |
|
9% |
| 5/10 | 4 |
|
11% |
| 4/10 | 3 |
|
9% |
| 3/10 | 1 |
|
3% |
| 2/10 | 0 |
|
0% |
| 1/10 | 0 |
|
0% |
71.71% Average
The raw data average (mean) for all the Kelly Tarlton's Antarctic Encounter and Underwater World face-to-face reviews is 71.71% and is based on 35 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.
Weighted Average
72.49%
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 |
|---|---|---|---|
| Frederik Fuchs | 7/10 | 3392 days | 100% |
| Xavier Bistodeau | 5/10 | 3659 days | 58% |
| Garry Renton | 8/10 | 4341 days | 0% |
| Jessie Sabine | 6/10 | 4384 days | 46% |
| David Embling | 5/10 | 4401 days | 40% |
| Cindy Bonton | 4/10 | 4432 days | 34% |
| Adam Critchley | 5/10 | 5121 days | 40% |
| Lilja Bjork Hermannsdottir | 7/10 | 5123 days | 50% |
| Remy van Heugten | 7/10 | 5123 days | 50% |
| hendrik king | 7/10 | 5186 days | 50% |
| Tsmith | 6/10 | 5339 days | 46% |
| Andreas Rath | 4/10 | 5446 days | 34% |
| M Holierhoek | 8/10 | 5463 days | 52% |
| Jarob Brezigar | 8/10 | 5482 days | 52% |
| Michael Eck | 5/10 | 5482 days | 40% |
| winglim | 5/10 | 5734 days | 40% |
| Candyfloss | 10/10 | 5765 days | 54% |
| Mr and Mrs Scott | 10/10 | 5826 days | 54% |
| Wender Jakoleseu | 6/10 | 5828 days | 46% |
| Ake Erlandsson | 10/10 | 5850 days | 54% |
| _mel_ | 3/10 | 5885 days | 27% |
| Anita de Boer | 8/10 | 5918 days | 52% |
| Neil | 10/10 | 6088 days | 54% |
| RolandV | 8/10 | 6144 days | 52% |
| Mikey | 9/10 | 6165 days | 53% |
| RichardE | 9/10 | 6195 days | 53% |
| Lars | 7/10 | 6227 days | 50% |
| stephanie | 9/10 | 6264 days | 53% |
| melissa | 9/10 | 6285 days | 53% |
| Ben | 7/10 | 6334 days | 50% |
| Michelle | 9/10 | 6334 days | 53% |
| Liz Brown | 8/10 | 6496 days | 52% |
| Kori Barton | 9/10 | 6502 days | 53% |
| Toni Keown | 4/10 | 6515 days | 34% |
| Myrtille de Vries | 7/10 | 6564 days | 50% |
| Haemnerli | 6/10 | 6565 days | 46% |
| Hans Olthof | 9/10 | 6603 days | 53% |
| Christin | 4/10 | 6650 days | 34% |
| Rob Boston | 3/10 | 6708 days | 27% |
| Kristine | 3/10 | 6872 days | 27% |
| Helen | 8/10 | 6878 days | 52% |
| Nancy Bill | 9/10 | 6884 days | 53% |
| Herman&Ineke | 9/10 | 6929 days | 53% |
| Suzy | 7/10 | 6930 days | 50% |
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 Kelly Tarlton's Antarctic Encounter and Underwater World experience has plenty of reviews and does not meet the criteria for any adjustment.
Recent Reviews Adjustment
-4.15% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 51 days. However the Kelly Tarlton's Antarctic Encounter and Underwater World 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 Kelly Tarlton's Antarctic Encounter and Underwater World experience has been adjusted for 200 days. Adjustments are according to the following table.
| Days | Adjustment |
|---|---|
| … | … |
| 197 | -4.09% |
| 198 | -4.11% |
| 199 | -4.13% |
| 200 | -4.15% |
| 201 | -4.18% |
| 202 | -4.20% |
| 203 | -4.22% |
| … | … |
Balancing Adjustment
7.98% 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
76%
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.