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
87.85%
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 | 2970 days | 94% |
| Alice Ormandy | 9/10 | 2992 days | 100% |
| Manu Liberta | 10/10 | 3037 days | 97% |
| Bram Hoonhout | 8/10 | 3043 days | 94% |
| Sarah | 10/10 | 3064 days | 95% |
| Robertoi | 9/10 | 3082 days | 92% |
| Charly | 9/10 | 3287 days | 73% |
| Liam King | 9/10 | 3299 days | 72% |
| Clare Holden | 10/10 | 3307 days | 73% |
| Oliver Schatz | 10/10 | 3334 days | 70% |
| Nick Young | 10/10 | 3339 days | 70% |
| Lisa | 8/10 | 3353 days | 66% |
| Josephine | 7/10 | 3369 days | 60% |
| Markus Delinsky | 8/10 | 3706 days | 35% |
| Hubert | 10/10 | 3778 days | 30% |
| Anja Weppler | 7/10 | 4012 days | 6% |
| Sandra Frischmann | 9/10 | 4042 days | 5% |
| Simon Galpin | 9/10 | 4043 days | 5% |
| Kletter | 9/10 | 4402 days | 21% |
| Jeanne Moustier | 9/10 | 4451 days | 21% |
| Michael Kretzschmar | 10/10 | 4486 days | 21% |
| Lydia Holleman | 9/10 | 4491 days | 21% |
| John | 9/10 | 4493 days | 21% |
| Jon Barratt | 9/10 | 4506 days | 21% |
| Kali Lohman | 8/10 | 4516 days | 20% |
| Stuart Arrol | 9/10 | 4739 days | 21% |
| melemele | 9/10 | 4744 days | 21% |
| Simon Rawlinson | 9/10 | 4756 days | 21% |
| Jill Homewood | 10/10 | 4768 days | 21% |
| Signe Kaspersen | 7/10 | 4769 days | 18% |
| Robert Steendijk | 7/10 | 4770 days | 18% |
| Jaap & Susanne | 7/10 | 4784 days | 18% |
| Aridne Giraud | 8/10 | 4787 days | 20% |
| Nora | 9/10 | 4788 days | 21% |
| Andy Bridgman | 7/10 | 4789 days | 18% |
| Nikki Bentley | 9/10 | 4790 days | 21% |
| Filsack | 8/10 | 4796 days | 20% |
| Herbert | 7/10 | 4817 days | 18% |
| Stephane Lebel | 10/10 | 5114 days | 21% |
| Florian | 9/10 | 5131 days | 21% |
| Antoine Van Hoovled | 9/10 | 5131 days | 21% |
| K Dahmer | 10/10 | 5134 days | 21% |
| Julia | 9/10 | 5139 days | 21% |
| WeddingMaven | 10/10 | 5141 days | 21% |
| Kasia Robshaw | 9/10 | 5145 days | 21% |
| Roger Lows | 9/10 | 5160 days | 21% |
| Jochen | 7/10 | 5167 days | 18% |
| VisualDelight | 10/10 | 5352 days | 21% |
| John Cox | 9/10 | 5512 days | 21% |
| Susi Schoetzler | 10/10 | 5554 days | 21% |
| Simon Bartholomew | 10/10 | 5608 days | 21% |
| Raewyn | 10/10 | 5837 days | 21% |
| Ger | 9/10 | 5838 days | 21% |
| jjakkeren | 7/10 | 5840 days | 18% |
| PaulC | 9/10 | 5846 days | 21% |
| Dave Ashun | 9/10 | 5847 days | 21% |
| ChristinaV | 8/10 | 5849 days | 20% |
| JanW | 3/10 | 5852 days | 0% |
| KatrinS | 8/10 | 5852 days | 20% |
| Christian Moll | 7/10 | 5856 days | 18% |
| Peter | 8/10 | 5856 days | 20% |
| Charles | 8/10 | 5872 days | 20% |
| JennyD1 | 7/10 | 5946 days | 18% |
| bobmcg | 10/10 | 5952 days | 21% |
| Stephanie Schikora | 10/10 | 5982 days | 21% |
| Paul | 7/10 | 6017 days | 18% |
| Suyin | 10/10 | 6037 days | 21% |
| Tom Ben | 10/10 | 6211 days | 21% |
| Anja Kunert | 9/10 | 6237 days | 21% |
| Zurcher Marco | 10/10 | 6267 days | 21% |
| Sandra Gustafson | 7/10 | 6282 days | 18% |
| Julie | 9/10 | 6525 days | 21% |
| Chatin Perrier | 10/10 | 6576 days | 21% |
| Pete | 9/10 | 6594 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 Southern Discoveries / Milford Sound Red Boats experience has plenty of reviews and does not meet the criteria for any adjustment.
Recent Reviews Adjustment
-3.81% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 59 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 | -3.75% |
| 198 | -3.77% |
| 199 | -3.79% |
| 200 | -3.81% |
| 201 | -3.82% |
| 202 | -3.84% |
| 203 | -3.86% |
| … | … |
Balancing Adjustment
2.02% 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.