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 The Waterworks.

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

The Waterworks

Valid Reviews

47 Valid Reviews

The The Waterworks experience has a total of 49 reviews. There are 47 valid reviews that are included when calculating the ranking score and 2 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 47 valid reviews:

Rating Count Percentage
10/10 24
9/10 10
8/10 9
7/10 2
6/10 1
5/10 1
4/10 0
3/10 0
2/10 0
1/10 0

90.85% Average

The raw data average (mean) for all the The Waterworks valid reviews is 90.85% and is based on 47 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

13 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 47 valid reviews, the experience has 13 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 13 face-to-face reviews:

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

84.62% Average

The raw data average (mean) for all the The Waterworks face-to-face reviews is 84.62% and is based on 13 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
Emma Keegan 7/10 2230 days 92%
Camille Guevel 9/10 2252 days 80%
Naelan Le Borgue 8/10 2252 days 75%
Jonas Nielsen 6/10 2633 days 45%
Leeann Newton 10/10 2653 days 56%
GN100 8/10 2653 days 53%
MichelleG2 10/10 2686 days 69%
William Notcutt 8/10 3051 days 40%
anaelena 10/10 3357 days 20%
Vbeirne 5/10 3417 days 12%
legomobilen 10/10 3478 days 11%
Mary Hamilton 10/10 3478 days 11%
erica130 10/10 3509 days 9%
debs 9/10 3509 days 9%
floflo 10/10 3630 days 0%
Kim652406 10/10 3661 days 36%
AliBe 10/10 3661 days 36%
Jo_harper 10/10 3692 days 36%
Jon_and_Family 9/10 3692 days 36%
bryanhamey 10/10 3692 days 36%
deanmatuka 10/10 3723 days 36%
Mirka Tinterova 9/10 3725 days 28%
Mr and Mrs Scott 8/10 4088 days 34%
Carolina Gonzalez 10/10 4114 days 28%
Ralf Genthe 9/10 4133 days 28%
Numun 9/10 4147 days 36%
kathryngorton 9/10 4178 days 36%
ona74 10/10 4178 days 36%
asiacritics 8/10 4208 days 34%
lizzie 10/10 4208 days 36%
Renee Porter 10/10 4330 days 36%
Jones 10/10 4330 days 36%
Chris Ogilvie 9/10 4330 days 36%
keryhuel patrick 9/10 4330 days 36%
Ben Tee 10/10 4330 days 36%
Lee Hanson 10/10 4391 days 36%
Matene 10/10 4391 days 36%
Charles Lyne 9/10 4391 days 36%
Belinda Muir 8/10 4512 days 34%
xp67 10/10 4524 days 36%
William McFarlanne 10/10 4667 days 36%
Audrey Fairclough 10/10 4683 days 36%
Andria Davis 10/10 4815 days 28%
SueLinsk 8/10 5151 days 26%
beesom 8/10 5188 days 26%
Rolf 8/10 5200 days 26%
Nicole 7/10 5200 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 The Waterworks experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-2.93% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 85 days. However the The Waterworks 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 The Waterworks experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -2.89%
198 -2.90%
199 -2.92%
200 -2.93%
201 -2.95%
202 -2.96%
203 -2.98%

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.