Ranking Score Explained

Kia ora there, 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.

Cymen Crick's avatar

Cymen Crick

Rankers Owner


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
9/10 13
8/10 9
7/10 1
6/10 4
5/10 0
4/10 0
3/10 0
2/10 1
1/10 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
9/10 12
8/10 9
7/10 1
6/10 3
5/10 0
4/10 0
3/10 0
2/10 0
1/10 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


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 1586 days 100%
Jozef Pinkerton 10/10 1757 days 91%
Audeme Mechain 10/10 1950 days 81%
Brenda Oomen 10/10 2315 days 62%
Fabian Rodriguez 10/10 2955 days 28%
Markus Spitzmueller 10/10 3082 days 21%
Stefanie Menz 6/10 3399 days 2%
Peer Krumrey 7/10 3399 days 3%
Karin Genyn 10/10 3488 days 0%
Evelyn Mackie 10/10 3770 days 18%
Steve Goodyear 8/10 3798 days 17%
Louis Smit 6/10 3801 days 14%
Sarah and Uli Glas 9/10 4123 days 18%
Ian and Ailsa 10/10 4130 days 18%
Cameron and Kim 8/10 4142 days 17%
Dave and Lin Mungham 10/10 4164 days 18%
Wijnhoven 9/10 4168 days 18%
Hilary and Chris Ayton 9/10 4496 days 18%
Ingrid Zell 10/10 4499 days 18%
Pam & Norman 9/10 4501 days 18%
Matthiis & Femke 8/10 4515 days 17%
Jenny 10/10 4516 days 18%
Lewis 10/10 4529 days 18%
R Gilge 10/10 4532 days 18%
Carl Diehl 9/10 4534 days 18%
Diane Chapple 9/10 4535 days 18%
Chris Bulman 10/10 4609 days 18%
Liliana Tello 9/10 4659 days 18%
linus 8/10 4724 days 17%
ElleGermany 9/10 4830 days 18%
Ger 9/10 4840 days 18%
SteveB 10/10 4842 days 18%
JuergenSchnitzer 10/10 4858 days 18%
Lilly Tillman 2/10 4859 days 12%
Kitty 9/10 4859 days 18%
Inger 8/10 4859 days 17%
Stolz 10/10 4865 days 18%
JetteG 10/10 4876 days 18%
Inger Skov 8/10 4885 days 17%
Edric Kwan 6/10 4886 days 14%
Raphael 9/10 4898 days 18%
P&L Mooney 9/10 5016 days 18%
Gorka Rojas 8/10 5114 days 17%
Sanne 10/10 5235 days 18%
Roger & Margaret 9/10 5256 days 18%
Mel 8/10 5294 days 17%
ranker_58 8/10 5444 days 17%
Schranger 6/10 5579 days 14%


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

-2.03% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 123 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 -1.99%
198 -2.00%
199 -2.02%
200 -2.03%
201 -2.04%
202 -2.05%
203 -2.06%

Final Ranking Score


The final ranking score once any adjustments, ratings, and rounding has been applied. This value is cached and recalculated each day. Therefore it may not be precisely accurate based on the other values presented.

If you have any questions or comments about our ranking score calculation please get in touch at info@rankers.co.nz.