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 1164 days 100%
Jozef Pinkerton 10/10 1335 days 92%
Audeme Mechain 10/10 1528 days 84%
Brenda Oomen 10/10 1893 days 68%
Fabian Rodriguez 10/10 2533 days 39%
Markus Spitzmueller 10/10 2660 days 34%
Stefanie Menz 6/10 2977 days 15%
Peer Krumrey 7/10 2977 days 17%
Karin Genyn 10/10 3066 days 16%
Evelyn Mackie 10/10 3348 days 3%
Steve Goodyear 8/10 3376 days 2%
Louis Smit 6/10 3379 days 0%
Sarah and Uli Glas 9/10 3701 days 13%
Ian and Ailsa 10/10 3708 days 13%
Cameron and Kim 8/10 3720 days 12%
Dave and Lin Mungham 10/10 3742 days 13%
Wijnhoven 9/10 3746 days 13%
Hilary and Chris Ayton 9/10 4074 days 13%
Ingrid Zell 10/10 4077 days 13%
Pam & Norman 9/10 4079 days 13%
Matthiis & Femke 8/10 4093 days 12%
Jenny 10/10 4094 days 13%
Lewis 10/10 4107 days 13%
R Gilge 10/10 4110 days 13%
Carl Diehl 9/10 4112 days 13%
Diane Chapple 9/10 4113 days 13%
Chris Bulman 10/10 4187 days 13%
Liliana Tello 9/10 4237 days 13%
linus 8/10 4302 days 12%
ElleGermany 9/10 4408 days 13%
Ger 9/10 4418 days 13%
SteveB 10/10 4420 days 13%
JuergenSchnitzer 10/10 4436 days 13%
Lilly Tillman 2/10 4437 days 7%
Kitty 9/10 4437 days 13%
Inger 8/10 4437 days 12%
Stolz 10/10 4444 days 13%
JetteG 10/10 4454 days 13%
Inger Skov 8/10 4463 days 12%
Edric Kwan 6/10 4464 days 9%
Raphael 9/10 4477 days 13%
P&L Mooney 9/10 4595 days 13%
Gorka Rojas 8/10 4692 days 12%
Sanne 10/10 4813 days 13%
Roger & Margaret 9/10 4834 days 13%
Mel 8/10 4872 days 12%
ranker_58 8/10 5022 days 12%
Schranger 6/10 5157 days 9%


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

-2.96% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 84 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 -2.91%
198 -2.93%
199 -2.94%
200 -2.96%
201 -2.97%
202 -2.99%
203 -3.00%

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.