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 10/10 170 days 100%
Juliane Mueller 10/10 693 days 38%
Dave Lamb 9/10 734 days 31%
Chris Simpson 10/10 769 days 27%
Josefin Lind 8/10 1429 days 5%
Herman Holmgist 10/10 1429 days 5%
Kate Morgan 10/10 2534 days 3%
Theta 10/10 2911 days 1%
Michael 10/10 2921 days 2%
Canuck85 10/10 3245 days 1%
danam 10/10 3247 days 1%
PBouwmessten 9/10 3265 days 1%
boz 10/10 3278 days 1%
Tom 9/10 3279 days 1%
Tom 8/10 3279 days 1%
Karen 9/10 3307 days 1%
Sophie 8/10 3317 days 1%
Richard Rodd 10/10 3323 days 1%
tarahenrys 10/10 3366 days 1%
David 9/10 3465 days 1%
Terri Scott 10/10 3481 days 1%
Mike Dudey 6/10 3527 days 1%
Nick 9/10 3631 days 1%
Robert 10/10 3637 days 1%
Elise 10/10 3637 days 1%
Fung 10/10 3637 days 1%
Shannon 7/10 3637 days 1%
Hannah Holmes 7/10 3645 days 1%
Sue 9/10 3649 days 1%
Gina 6/10 3654 days 1%
Issy 9/10 3654 days 1%
Chris 8/10 3670 days 1%
Stacey 8/10 3670 days 1%
Christina 10/10 3915 days 0%
Tomomi 8/10 3973 days 0%
Dave 9/10 3975 days 0%
Uri 10/10 3975 days 0%
James 9/10 3975 days 0%
Valerie 9/10 3982 days 0%
Karen Nellist 8/10 4000 days 0%
GillianW 8/10 4001 days 0%
Camilla 9/10 4021 days 0%
Twan 8/10 4021 days 0%
PaulineTurner 10/10 4022 days 0%
RosalindBoyes 9/10 4022 days 0%
Paul 10/10 4023 days 0%
Stauros 9/10 4023 days 0%
ranker_410 10/10 4034 days 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 River Valley Rafting experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-2.78% Adjustment

There may be an adjustment if an experience hasn't received any reviews within the last 60 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 364 days.

The River Valley Rafting experience has been adjusted for 139 days. Adjustments are according to the following table.

Days Adjustment
136 -2.72%
137 -2.74%
138 -2.76%
139 -2.78%
140 -2.80%
141 -2.82%
142 -2.84%

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.