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 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.

Nick Morrison's avatar

Nick Morrison

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
60%
9/10 9
18%
8/10 8
16%
7/10 3
6%
6/10 0
0%
5/10 0
0%
4/10 0
0%
3/10 0
0%
2/10 0
0%
1/10 0
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
60%
9/10 8
19%
8/10 6
14%
7/10 3
7%
6/10 0
0%
5/10 0
0%
4/10 0
0%
3/10 0
0%
2/10 0
0%
1/10 0
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

96.45%

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 Face-to-Face Weight Relative Weight
Rick Stockdale 10/10 946 days true 8.52 100%
Manu Liberta 10/10 1022 days true 5.84 69%
Faye Kokolakis 10/10 1023 days 5.82 68%
Peter Hodgson 10/10 1333 days true 4.59 54%
Julian Roots 9/10 2395 days 2.77 33%
Kali Lohman 8/10 2501 days true 2.46 29%
Rick Moth 10/10 2769 days true 2.13 25%
Elaine 10/10 2770 days true 2.13 25%
Mike & Jennie 9/10 2771 days true 2.13 25%
Sabine 10/10 2772 days true 2.13 25%
katel86 8/10 2942 days 1.75 20%
Debbie Smithers 10/10 3084 days true 1.59 19%
Laurent Pouvreau 10/10 3098 days true 1.57 18%
Ray Banham 9/10 3106 days true 1.56 18%
Ian & Phyllis 10/10 3118 days true 1.54 18%
Geert Van Tittelboom 10/10 3130 days true 1.52 18%
Irene and Thib Schneider 10/10 3142 days true 1.49 18%
antrobdozer 10/10 3338 days 1.16 14%
Chris el capitan 7/10 3496 days true 0.81 9%
Amanda Iavarone 10/10 3497 days true 0.89 10%
Janny Meerdinnk Veldboow 10/10 3497 days true 0.89 10%
Yvonne Ing 10/10 3518 days true 0.85 10%
Chance McGuire 10/10 3519 days 0.85 10%
E.M. Prideaux 10/10 3533 days true 0.83 10%
Bartlett nz 10/10 3536 days true 0.82 10%
joannaw 10/10 3566 days true 0.77 9%
TomL 10/10 3611 days 0.69 8%
marleen451 8/10 3642 days 0.61 7%
rogerandchristine 10/10 3710 days true 0.52 6%
joevw 10/10 3780 days true 0.4 5%
ElizabethF 9/10 3792 days true 0.38 4%
Philipp 8/10 3825 days true 0.31 4%
JasminA 8/10 3825 days true 0.31 4%
brendar 10/10 3825 days true 0.33 4%
AstridVG 7/10 3842 days true 0.27 3%
Vivien Williams 10/10 3843 days true 0.29 3%
JohannaB 8/10 3844 days true 0.28 3%
Joery 9/10 3848 days true 0.29 3%
Debbie 9/10 3848 days true 0.29 3%
Kevin 10/10 3856 days true 0.27 3%
ChenM 9/10 3859 days true 0.27 3%
CollyBob 10/10 4097 days true 0.0 0%
Rachel 9/10 4191 days true 0.0 0%
Alison Street 9/10 4224 days true 0.0 0%
Wanda 10/10 4226 days true 0.0 0%
Blenkoe 8/10 4230 days true 0.0 0%
ranker_36 8/10 4427 days true 0.0 0%
Peter 7/10 4595 days true 0.0 0%
Peter 10/10 4607 days true 0.0 0%
Brian 10/10 4607 days true 0.0 0%

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

Recent Reviews Adjustment

-3.98% Adjustment

There may be an adjustment if an experience hasn't received any reviews within the last 60 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 199 days.

The Glacier Helicopters experience has been adjusted for 199 days. Adjustments are according to the following table.

Days Adjustment
196 -3.92%
197 -3.94%
198 -3.96%
199 -3.98%
200 -4.00%
201 -4.02%
202 -4.04%

Final Ranking Score

92%

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.