Kia ora, 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 HeliServices.NZ.
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.
HeliServices.NZ
Valid Reviews
48 Valid Reviews
The HeliServices.NZ experience has a total of 48 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 48 valid reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 20 |
|
42% |
| 9/10 | 13 |
|
27% |
| 8/10 | 9 |
|
19% |
| 7/10 | 1 |
|
2% |
| 6/10 | 4 |
|
8% |
| 5/10 | 0 |
|
0% |
| 4/10 | 0 |
|
0% |
| 3/10 | 0 |
|
0% |
| 2/10 | 1 |
|
2% |
| 1/10 | 0 |
|
0% |
87.92% Average
The raw data average (mean) for all the HeliServices.NZ valid reviews is 87.92% and is based on 48 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
42 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 48 valid reviews, the experience has 42 face-to-face reviews collected during interviews by our team.
Below is the distribution of ratings for the 42 face-to-face reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 17 |
|
40% |
| 9/10 | 12 |
|
29% |
| 8/10 | 9 |
|
21% |
| 7/10 | 1 |
|
2% |
| 6/10 | 3 |
|
7% |
| 5/10 | 0 |
|
0% |
| 4/10 | 0 |
|
0% |
| 3/10 | 0 |
|
0% |
| 2/10 | 0 |
|
0% |
| 1/10 | 0 |
|
0% |
89.29% Average
The raw data average (mean) for all the HeliServices.NZ face-to-face reviews is 89.29% and is based on 42 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.
Weighted Average
91.31%
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 |
|---|---|---|---|
| S Weslake | 10/10 | 2438 days | 100% |
| Jozef Pinkerton | 10/10 | 2609 days | 91% |
| Audeme Mechain | 10/10 | 2802 days | 81% |
| Brenda Oomen | 10/10 | 3167 days | 62% |
| Fabian Rodriguez | 10/10 | 3807 days | 28% |
| Markus Spitzmueller | 10/10 | 3934 days | 21% |
| Stefanie Menz | 6/10 | 4251 days | 4% |
| Peer Krumrey | 7/10 | 4251 days | 4% |
| Karin Genyn | 10/10 | 4340 days | 0% |
| Evelyn Mackie | 10/10 | 4622 days | 25% |
| Steve Goodyear | 8/10 | 4650 days | 24% |
| Louis Smit | 6/10 | 4653 days | 21% |
| Sarah and Uli Glas | 9/10 | 4975 days | 24% |
| Ian and Ailsa | 10/10 | 4982 days | 25% |
| Cameron and Kim | 8/10 | 4994 days | 24% |
| Dave and Lin Mungham | 10/10 | 5016 days | 25% |
| Wijnhoven | 9/10 | 5020 days | 24% |
| Hilary and Chris Ayton | 9/10 | 5348 days | 24% |
| Ingrid Zell | 10/10 | 5351 days | 25% |
| Pam & Norman | 9/10 | 5353 days | 24% |
| Matthiis & Femke | 8/10 | 5367 days | 24% |
| Jenny | 10/10 | 5368 days | 25% |
| Lewis | 10/10 | 5381 days | 25% |
| R Gilge | 10/10 | 5384 days | 25% |
| Carl Diehl | 9/10 | 5386 days | 24% |
| Diane Chapple | 9/10 | 5387 days | 24% |
| Chris Bulman | 10/10 | 5461 days | 25% |
| Liliana Tello | 9/10 | 5511 days | 24% |
| linus | 8/10 | 5576 days | 24% |
| ElleGermany | 9/10 | 5682 days | 24% |
| Ger | 9/10 | 5692 days | 24% |
| SteveB | 10/10 | 5694 days | 25% |
| JuergenSchnitzer | 10/10 | 5710 days | 25% |
| Lilly Tillman | 2/10 | 5711 days | 10% |
| Kitty | 9/10 | 5711 days | 24% |
| Inger | 8/10 | 5712 days | 24% |
| Stolz | 10/10 | 5718 days | 25% |
| JetteG | 10/10 | 5728 days | 25% |
| Inger Skov | 8/10 | 5737 days | 24% |
| Edric Kwan | 6/10 | 5738 days | 21% |
| Raphael | 9/10 | 5751 days | 24% |
| P&L Mooney | 9/10 | 5869 days | 24% |
| Gorka Rojas | 8/10 | 5967 days | 24% |
| Sanne | 10/10 | 6087 days | 25% |
| Roger & Margaret | 9/10 | 6108 days | 24% |
| Mel | 8/10 | 6146 days | 24% |
| ranker_58 | 8/10 | 6296 days | 24% |
| Schranger | 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 HeliServices.NZ experience has plenty of reviews and does not meet the criteria for any adjustment.
Recent Reviews Adjustment
-3.88% Adjustment
There may be an adjustment if this experience hasn't received any reviews within the last 49 days. However the HeliServices.NZ 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 HeliServices.NZ experience has been adjusted for 200 days. Adjustments are according to the following table.
| Days | Adjustment |
|---|---|
| … | … |
| 197 | -3.82% |
| 198 | -3.84% |
| 199 | -3.86% |
| 200 | -3.88% |
| 201 | -3.90% |
| 202 | -3.92% |
| 203 | -3.94% |
| … | … |
Balancing Adjustment
1.39% 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
89%
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.