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 Glacier Helicopters.

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

Glacier Helicopters

Valid Reviews

50 Valid Reviews

The Glacier Helicopters experience has a total of 50 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 50 valid reviews:

Rating Count Percentage
10/10 30
9/10 9
8/10 8
7/10 3
6/10 0
5/10 0
4/10 0
3/10 0
2/10 0
1/10 0

93.20% Average

The raw data average (mean) for all the Glacier Helicopters valid reviews is 93.20% and is based on 50 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

43 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 50 valid reviews, the experience has 43 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 43 face-to-face reviews:

Rating Count Percentage
10/10 26
9/10 8
8/10 6
7/10 3
6/10 0
5/10 0
4/10 0
3/10 0
2/10 0
1/10 0

93.26% Average

The raw data average (mean) for all the Glacier Helicopters face-to-face reviews is 93.26% and is based on 43 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
Rick Stockdale 10/10 1966 days 100%
Manu Liberta 10/10 2042 days 95%
Faye Kokolakis 10/10 2043 days 95%
Peter Hodgson 10/10 2353 days 75%
Julian Roots 9/10 3415 days 7%
Kali Lohman 8/10 3521 days 0%
Rick Moth 10/10 3789 days 25%
Elaine 10/10 3790 days 25%
Mike & Jennie 9/10 3791 days 25%
Sabine 10/10 3792 days 25%
katel86 8/10 3962 days 23%
Debbie Smithers 10/10 4104 days 25%
Laurent Pouvreau 10/10 4118 days 25%
Ray Banham 9/10 4126 days 25%
Ian & Phyllis 10/10 4138 days 25%
Geert Van Tittelboom 10/10 4150 days 25%
Irene and Thib Schneider 10/10 4162 days 25%
antrobdozer 10/10 4358 days 25%
Chris el capitan 7/10 4516 days 22%
Amanda Iavarone 10/10 4517 days 25%
Janny Meerdinnk Veldboow 10/10 4517 days 25%
Yvonne Ing 10/10 4538 days 25%
Chance McGuire 10/10 4539 days 25%
E.M. Prideaux 10/10 4553 days 25%
Bartlett nz 10/10 4556 days 25%
joannaw 10/10 4586 days 25%
TomL 10/10 4631 days 25%
marleen451 8/10 4662 days 23%
rogerandchristine 10/10 4730 days 25%
joevw 10/10 4800 days 25%
ElizabethF 9/10 4812 days 25%
Philipp 8/10 4845 days 23%
JasminA 8/10 4845 days 23%
brendar 10/10 4845 days 25%
AstridVG 7/10 4862 days 22%
Vivien Williams 10/10 4863 days 25%
JohannaB 8/10 4864 days 23%
Joery 9/10 4868 days 25%
Debbie 9/10 4868 days 25%
Kevin 10/10 4876 days 25%
ChenM 9/10 4879 days 25%
CollyBob 10/10 5117 days 25%
Rachel 9/10 5211 days 25%
Alison Street 9/10 5244 days 25%
Wanda 10/10 5246 days 25%
Blenkoe 8/10 5250 days 23%
ranker_36 8/10 5447 days 23%
Peter 7/10 5615 days 22%
Peter 10/10 5627 days 25%
Brian 10/10 5627 days 25%


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 Glacier Helicopters experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-2.01% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 124 days. However the Glacier Helicopters 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 Glacier Helicopters experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -1.98%
198 -1.99%
199 -2.00%
200 -2.01%
201 -2.02%
202 -2.03%
203 -2.04%

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.