Ranking Score Explained

Hi 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.

Nick Morrison's avatar

Nick Morrison

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 1064 days 100%
Jozef Pinkerton 10/10 1235 days 92%
Audeme Mechain 10/10 1428 days 84%
Brenda Oomen 10/10 1793 days 70%
Fabian Rodriguez 10/10 2433 days 46%
Markus Spitzmueller 10/10 2560 days 41%
Stefanie Menz 6/10 2877 days 24%
Peer Krumrey 7/10 2877 days 27%
Karin Genyn 10/10 2966 days 26%
Evelyn Mackie 10/10 3248 days 15%
Steve Goodyear 8/10 3276 days 13%
Louis Smit 6/10 3279 days 12%
Sarah and Uli Glas 9/10 3601 days 2%
Ian and Ailsa 10/10 3608 days 1%
Cameron and Kim 8/10 3620 days 1%
Dave and Lin Mungham 10/10 3642 days 0%
Wijnhoven 9/10 3646 days 0%
Hilary and Chris Ayton 9/10 3974 days 19%
Ingrid Zell 10/10 3977 days 19%
Pam & Norman 9/10 3979 days 19%
Matthiis & Femke 8/10 3993 days 18%
Jenny 10/10 3994 days 19%
Lewis 10/10 4007 days 19%
R Gilge 10/10 4010 days 19%
Carl Diehl 9/10 4012 days 19%
Diane Chapple 9/10 4013 days 19%
Chris Bulman 10/10 4087 days 19%
Liliana Tello 9/10 4137 days 19%
linus 8/10 4202 days 18%
ElleGermany 9/10 4308 days 19%
Ger 9/10 4318 days 19%
SteveB 10/10 4320 days 19%
JuergenSchnitzer 10/10 4336 days 19%
Lilly Tillman 2/10 4336 days 14%
Kitty 9/10 4337 days 19%
Inger 8/10 4337 days 18%
Stolz 10/10 4343 days 19%
JetteG 10/10 4354 days 19%
Inger Skov 8/10 4363 days 18%
Edric Kwan 6/10 4364 days 16%
Raphael 9/10 4376 days 19%
P&L Mooney 9/10 4494 days 19%
Gorka Rojas 8/10 4592 days 18%
Sanne 10/10 4713 days 19%
Roger & Margaret 9/10 4734 days 19%
Mel 8/10 4772 days 18%
ranker_58 8/10 4922 days 18%
Schranger 6/10 5057 days 16%


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

-4.13% 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 -4.07%
198 -4.09%
199 -4.11%
200 -4.13%
201 -4.15%
202 -4.17%
203 -4.19%

Final Ranking Score


The final ranking score once adjustments 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.