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 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
87.66%
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 | 2854 days | 95% |
| Alice Ormandy | 9/10 | 2876 days | 100% |
| Manu Liberta | 10/10 | 2921 days | 98% |
| Bram Hoonhout | 8/10 | 2927 days | 96% |
| Sarah | 10/10 | 2948 days | 96% |
| Robertoi | 9/10 | 2966 days | 94% |
| Charly | 9/10 | 3171 days | 80% |
| Liam King | 9/10 | 3183 days | 80% |
| Clare Holden | 10/10 | 3191 days | 80% |
| Oliver Schatz | 10/10 | 3218 days | 78% |
| Nick Young | 10/10 | 3223 days | 78% |
| Lisa | 8/10 | 3237 days | 75% |
| Josephine | 7/10 | 3253 days | 70% |
| Markus Delinsky | 8/10 | 3590 days | 52% |
| Hubert | 10/10 | 3662 days | 48% |
| Anja Weppler | 7/10 | 3896 days | 30% |
| Sandra Frischmann | 9/10 | 3926 days | 30% |
| Simon Galpin | 9/10 | 3927 days | 30% |
| Kletter | 9/10 | 4286 days | 6% |
| Jeanne Moustier | 9/10 | 4335 days | 3% |
| Michael Kretzschmar | 10/10 | 4370 days | 0% |
| Lydia Holleman | 9/10 | 4375 days | 0% |
| John | 9/10 | 4377 days | 0% |
| Jon Barratt | 9/10 | 4390 days | 34% |
| Kali Lohman | 8/10 | 4400 days | 34% |
| Stuart Arrol | 9/10 | 4624 days | 34% |
| melemele | 9/10 | 4628 days | 34% |
| Simon Rawlinson | 9/10 | 4640 days | 34% |
| Jill Homewood | 10/10 | 4652 days | 34% |
| Signe Kaspersen | 7/10 | 4653 days | 32% |
| Robert Steendijk | 7/10 | 4654 days | 32% |
| Jaap & Susanne | 7/10 | 4668 days | 32% |
| Aridne Giraud | 8/10 | 4671 days | 34% |
| Nora | 9/10 | 4672 days | 34% |
| Andy Bridgman | 7/10 | 4673 days | 32% |
| Nikki Bentley | 9/10 | 4674 days | 34% |
| Filsack | 8/10 | 4680 days | 34% |
| Herbert | 7/10 | 4701 days | 32% |
| Stephane Lebel | 10/10 | 4998 days | 34% |
| Florian | 9/10 | 5015 days | 34% |
| Antoine Van Hoovled | 9/10 | 5015 days | 34% |
| K Dahmer | 10/10 | 5018 days | 34% |
| Julia | 9/10 | 5023 days | 34% |
| WeddingMaven | 10/10 | 5025 days | 34% |
| Kasia Robshaw | 9/10 | 5029 days | 34% |
| Roger Lows | 9/10 | 5044 days | 34% |
| Jochen | 7/10 | 5051 days | 32% |
| VisualDelight | 10/10 | 5237 days | 34% |
| John Cox | 9/10 | 5396 days | 34% |
| Susi Schoetzler | 10/10 | 5438 days | 34% |
| Simon Bartholomew | 10/10 | 5492 days | 34% |
| Raewyn | 10/10 | 5721 days | 34% |
| Ger | 9/10 | 5722 days | 34% |
| jjakkeren | 7/10 | 5724 days | 32% |
| PaulC | 9/10 | 5731 days | 34% |
| Dave Ashun | 9/10 | 5731 days | 34% |
| ChristinaV | 8/10 | 5734 days | 34% |
| JanW | 3/10 | 5736 days | 19% |
| KatrinS | 8/10 | 5736 days | 34% |
| Christian Moll | 7/10 | 5740 days | 32% |
| Peter | 8/10 | 5741 days | 34% |
| Charles | 8/10 | 5757 days | 34% |
| JennyD1 | 7/10 | 5830 days | 32% |
| bobmcg | 10/10 | 5837 days | 34% |
| Stephanie Schikora | 10/10 | 5867 days | 34% |
| Paul | 7/10 | 5902 days | 32% |
| Suyin | 10/10 | 5922 days | 34% |
| Tom Ben | 10/10 | 6095 days | 34% |
| Anja Kunert | 9/10 | 6121 days | 34% |
| Zurcher Marco | 10/10 | 6151 days | 34% |
| Sandra Gustafson | 7/10 | 6166 days | 32% |
| Julie | 9/10 | 6410 days | 34% |
| Chatin Perrier | 10/10 | 6461 days | 34% |
| Pete | 9/10 | 6478 days | 34% |
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
-4.07% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 43 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 | -4.01% |
| 198 | -4.03% |
| 199 | -4.05% |
| 200 | -4.07% |
| 201 | -4.09% |
| 202 | -4.11% |
| 203 | -4.13% |
| … | … |
Balancing Adjustment
2.12% 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.