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 Southern Discoveries / Milford Sound Red Boats.
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.
Southern Discoveries / Milford Sound Red Boats
Valid Reviews
74 Valid Reviews
The Southern Discoveries / Milford Sound Red Boats 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 | 21 |
|
28% |
| 9/10 | 28 |
|
38% |
| 8/10 | 10 |
|
14% |
| 7/10 | 14 |
|
19% |
| 6/10 | 0 |
|
0% |
| 5/10 | 0 |
|
0% |
| 4/10 | 0 |
|
0% |
| 3/10 | 1 |
|
1% |
| 2/10 | 0 |
|
0% |
| 1/10 | 0 |
|
0% |
86.89% Average
The raw data average (mean) for all the Southern Discoveries / Milford Sound Red Boats valid reviews is 86.89% 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
69 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 69 face-to-face reviews collected during interviews by our team.
Below is the distribution of ratings for the 69 face-to-face reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 17 |
|
25% |
| 9/10 | 27 |
|
39% |
| 8/10 | 10 |
|
14% |
| 7/10 | 14 |
|
20% |
| 6/10 | 0 |
|
0% |
| 5/10 | 0 |
|
0% |
| 4/10 | 0 |
|
0% |
| 3/10 | 1 |
|
1% |
| 2/10 | 0 |
|
0% |
| 1/10 | 0 |
|
0% |
86.09% Average
The raw data average (mean) for all the Southern Discoveries / Milford Sound Red Boats face-to-face reviews is 86.09% and is based on 69 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.
Weighted Average
87.57%
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 |
|---|---|---|---|
| C Clarke | 7/10 | 3359 days | 95% |
| Alice Ormandy | 9/10 | 3381 days | 100% |
| Manu Liberta | 10/10 | 3426 days | 95% |
| Bram Hoonhout | 8/10 | 3432 days | 92% |
| Sarah | 10/10 | 3453 days | 92% |
| Robertoi | 9/10 | 3471 days | 89% |
| Charly | 9/10 | 3676 days | 62% |
| Liam King | 9/10 | 3688 days | 61% |
| Clare Holden | 10/10 | 3696 days | 61% |
| Oliver Schatz | 10/10 | 3723 days | 57% |
| Nick Young | 10/10 | 3728 days | 57% |
| Lisa | 8/10 | 3742 days | 53% |
| Josephine | 7/10 | 3758 days | 47% |
| Markus Delinsky | 8/10 | 4095 days | 9% |
| Hubert | 10/10 | 4167 days | 0% |
| Anja Weppler | 7/10 | 4401 days | 34% |
| Sandra Frischmann | 9/10 | 4431 days | 38% |
| Simon Galpin | 9/10 | 4432 days | 38% |
| Kletter | 9/10 | 4791 days | 38% |
| Jeanne Moustier | 9/10 | 4840 days | 38% |
| Michael Kretzschmar | 10/10 | 4875 days | 38% |
| Lydia Holleman | 9/10 | 4880 days | 38% |
| John | 9/10 | 4882 days | 38% |
| Jon Barratt | 9/10 | 4895 days | 38% |
| Kali Lohman | 8/10 | 4905 days | 37% |
| Stuart Arrol | 9/10 | 5129 days | 38% |
| melemele | 9/10 | 5133 days | 38% |
| Simon Rawlinson | 9/10 | 5145 days | 38% |
| Jill Homewood | 10/10 | 5157 days | 38% |
| Signe Kaspersen | 7/10 | 5158 days | 34% |
| Robert Steendijk | 7/10 | 5159 days | 34% |
| Jaap & Susanne | 7/10 | 5173 days | 34% |
| Aridne Giraud | 8/10 | 5176 days | 37% |
| Nora | 9/10 | 5177 days | 38% |
| Andy Bridgman | 7/10 | 5178 days | 34% |
| Nikki Bentley | 9/10 | 5179 days | 38% |
| Filsack | 8/10 | 5185 days | 37% |
| Herbert | 7/10 | 5206 days | 34% |
| Stephane Lebel | 10/10 | 5503 days | 38% |
| Florian | 9/10 | 5520 days | 38% |
| Antoine Van Hoovled | 9/10 | 5520 days | 38% |
| K Dahmer | 10/10 | 5523 days | 38% |
| Julia | 9/10 | 5528 days | 38% |
| WeddingMaven | 10/10 | 5530 days | 38% |
| Kasia Robshaw | 9/10 | 5534 days | 38% |
| Roger Lows | 9/10 | 5549 days | 38% |
| Jochen | 7/10 | 5556 days | 34% |
| VisualDelight | 10/10 | 5742 days | 38% |
| John Cox | 9/10 | 5901 days | 38% |
| Susi Schoetzler | 10/10 | 5943 days | 38% |
| Simon Bartholomew | 10/10 | 5997 days | 38% |
| Raewyn | 10/10 | 6226 days | 38% |
| Ger | 9/10 | 6227 days | 38% |
| jjakkeren | 7/10 | 6229 days | 34% |
| PaulC | 9/10 | 6235 days | 38% |
| Dave Ashun | 9/10 | 6236 days | 38% |
| ChristinaV | 8/10 | 6238 days | 37% |
| JanW | 3/10 | 6241 days | 8% |
| KatrinS | 8/10 | 6241 days | 37% |
| Christian Moll | 7/10 | 6245 days | 34% |
| Peter | 8/10 | 6245 days | 37% |
| Charles | 8/10 | 6261 days | 37% |
| JennyD1 | 7/10 | 6335 days | 34% |
| bobmcg | 10/10 | 6342 days | 38% |
| Stephanie Schikora | 10/10 | 6372 days | 38% |
| Paul | 7/10 | 6406 days | 34% |
| Suyin | 10/10 | 6427 days | 38% |
| Tom Ben | 10/10 | 6600 days | 38% |
| Anja Kunert | 9/10 | 6626 days | 38% |
| Zurcher Marco | 10/10 | 6656 days | 38% |
| Sandra Gustafson | 7/10 | 6671 days | 34% |
| Julie | 9/10 | 6915 days | 38% |
| Chatin Perrier | 10/10 | 6966 days | 38% |
| Pete | 9/10 | 6983 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 Southern Discoveries / Milford Sound Red Boats experience has plenty of reviews and does not meet the criteria for any adjustment.
Recent Reviews Adjustment
-3.34% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 70 days. However the Southern Discoveries / Milford Sound Red Boats 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 Southern Discoveries / Milford Sound Red Boats experience has been adjusted for 200 days. Adjustments are according to the following table.
| Days | Adjustment |
|---|---|
| … | … |
| 197 | -3.29% |
| 198 | -3.30% |
| 199 | -3.32% |
| 200 | -3.34% |
| 201 | -3.35% |
| 202 | -3.37% |
| 203 | -3.39% |
| … | … |
Balancing Adjustment
1.98% 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
86%
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.