Ranking Score Explained

Kia ora 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.

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Cymen Crick

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 1812 days 100%
Juliane Mueller 10/10 2335 days 63%
Dave Lamb 9/10 2376 days 60%
Chris Simpson 10/10 2411 days 58%
Josefin Lind 8/10 3071 days 9%
Herman Holmgist 10/10 3071 days 11%
Kate Morgan 10/10 4176 days 6%
Theta 10/10 4553 days 6%
Michael 10/10 4563 days 6%
Canuck85 10/10 4887 days 6%
danam 10/10 4888 days 6%
PBouwmessten 9/10 4907 days 6%
boz 10/10 4919 days 6%
Tom 9/10 4921 days 6%
Tom 8/10 4921 days 4%
Karen 9/10 4949 days 6%
Sophie 8/10 4959 days 4%
Richard Rodd 10/10 4965 days 6%
tarahenrys 10/10 5008 days 6%
David 9/10 5106 days 6%
Terri Scott 10/10 5123 days 6%
Mike Dudey 6/10 5169 days 0%
Nick 9/10 5273 days 6%
Robert 10/10 5279 days 6%
Elise 10/10 5279 days 6%
Fung 10/10 5279 days 6%
Shannon 7/10 5279 days 3%
Hannah Holmes 7/10 5287 days 3%
Sue 9/10 5291 days 6%
Gina 6/10 5296 days 0%
Issy 9/10 5296 days 6%
Chris 8/10 5312 days 4%
Stacey 8/10 5312 days 4%
Christina 10/10 5557 days 6%
Tomomi 8/10 5615 days 4%
Dave 9/10 5617 days 6%
Uri 10/10 5617 days 6%
James 9/10 5617 days 6%
Valerie 9/10 5624 days 6%
Karen Nellist 8/10 5642 days 4%
GillianW 8/10 5643 days 4%
Camilla 9/10 5663 days 6%
Twan 8/10 5663 days 4%
PaulineTurner 10/10 5664 days 6%
RosalindBoyes 9/10 5664 days 6%
Paul 10/10 5665 days 6%
Stauros 9/10 5665 days 6%
ranker_410 10/10 5676 days 6%


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

-2.35% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 111 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 -2.31%
198 -2.32%
199 -2.33%
200 -2.35%
201 -2.36%
202 -2.37%
203 -2.38%

Final Ranking Score


The final ranking score once any adjustments, ratings, 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.