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 Roselands Waitomo Caves.

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

Roselands Waitomo Caves

Valid Reviews

23 Valid Reviews

The Roselands Waitomo Caves experience has a total of 26 reviews. There are 23 valid reviews that are included when calculating the ranking score and 3 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.

Within these 23 valid reviews, the experience has 2 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 23 valid reviews:

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

90.43% Average

The raw data average (mean) for all the Roselands Waitomo Caves valid reviews is 90.43% and is based on 23 valid reviews. This value is not used to calculate the ranking score and it only provided here as a comparison to the weighted average.

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 Face-to-Face Weight Relative Weight
Elle 10/10 39 days 99.76 100%
Cody 8/10 131 days 92.42 92%
Ruth 10/10 160 days 95.94 96%
James F 9/10 191 days 94.22 94%
Peter 9/10 191 days 94.22 94%
Javier Williams 8/10 222 days 87.58 87%
Trace Ann 10/10 313 days 84.48 84%
Flatlanders 8/10 556 days 48.48 46%
Indy 8/10 617 days 39.15 36%
Rugby 9/10 648 days 36.66 34%
Mike Fricker 10/10 678 days 32.55 29%
Yang Chong 10/10 678 days 32.55 29%
Leslie Anderson 10/10 709 days 28.61 25%
Boa 9/10 709 days 28.61 25%
May 8/10 709 days 27.18 24%
Robert Gatford 9/10 886 days 11.92 8%
Luis Vigil Vidal 9/10 904 days true 10.78 7%
Ronald Daigneault 9/10 945 days true 8.57 4%
Vander Plancke Julien 10/10 974 days 7.32 3%
Stacey Cheong 8/10 988 days 6.47 2%
Erin Brown 10/10 998 days 6.49 2%
Jo Dawson 7/10 1105 days 4.53 0%
Hannah Jones 10/10 1152 days 4.89 0%


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 Roselands Waitomo Caves experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-0.35% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 125 days. However the Roselands Waitomo Caves 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 Roselands Waitomo Caves experience has been adjusted for 35 days. Adjustments are according to the following table.

Days Adjustment
32 -0.32%
33 -0.33%
34 -0.34%
35 -0.35%
36 -0.36%
37 -0.37%
38 -0.38%

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.