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 River Valley Rafting.

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

River Valley Rafting

Valid Reviews

48 Valid Reviews

The River Valley Rafting experience has a total of 49 reviews. There are 48 valid reviews that are included when calculating the ranking score and 1 invalid review 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 21
9/10 14
8/10 9
7/10 2
6/10 2
5/10 0
4/10 0
3/10 0
2/10 0
1/10 0

90.42% Average

The raw data average (mean) for all the River Valley Rafting valid reviews is 90.42% 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 15
9/10 14
8/10 9
7/10 2
6/10 2
5/10 0
4/10 0
3/10 0
2/10 0
1/10 0

89.05% Average

The raw data average (mean) for all the River Valley Rafting face-to-face reviews is 89.05% 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
R R 10/10 1330 days 100%
Juliane Mueller 10/10 1853 days 72%
Dave Lamb 9/10 1894 days 70%
Chris Simpson 10/10 1929 days 68%
Josefin Lind 8/10 2589 days 31%
Herman Holmgist 10/10 2589 days 34%
Kate Morgan 10/10 3694 days 5%
Theta 10/10 4071 days 5%
Michael 10/10 4081 days 5%
Canuck85 10/10 4405 days 5%
danam 10/10 4407 days 5%
PBouwmessten 9/10 4425 days 5%
boz 10/10 4438 days 5%
Tom 9/10 4439 days 5%
Tom 8/10 4439 days 3%
Karen 9/10 4467 days 5%
Sophie 8/10 4477 days 3%
Richard Rodd 10/10 4484 days 5%
tarahenrys 10/10 4526 days 5%
David 9/10 4625 days 5%
Terri Scott 10/10 4641 days 5%
Mike Dudey 6/10 4687 days 0%
Nick 9/10 4791 days 5%
Robert 10/10 4797 days 5%
Elise 10/10 4797 days 5%
Fung 10/10 4797 days 5%
Shannon 7/10 4797 days 2%
Hannah Holmes 7/10 4805 days 2%
Sue 9/10 4809 days 5%
Gina 6/10 4814 days 0%
Issy 9/10 4814 days 5%
Chris 8/10 4830 days 3%
Stacey 8/10 4830 days 3%
Christina 10/10 5075 days 5%
Tomomi 8/10 5133 days 3%
Dave 9/10 5135 days 5%
Uri 10/10 5135 days 5%
James 9/10 5135 days 5%
Valerie 9/10 5142 days 5%
Karen Nellist 8/10 5160 days 3%
GillianW 8/10 5161 days 3%
Camilla 9/10 5181 days 5%
Twan 8/10 5181 days 3%
PaulineTurner 10/10 5182 days 5%
RosalindBoyes 9/10 5182 days 5%
Paul 10/10 5183 days 5%
Stauros 9/10 5183 days 5%
ranker_410 10/10 5194 days 5%


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 River Valley Rafting experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-3.29% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 71 days. However the River Valley Rafting 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 River Valley Rafting experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -3.24%
198 -3.26%
199 -3.28%
200 -3.29%
201 -3.31%
202 -3.32%
203 -3.34%

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.