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 Norwest Adventures.

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.

Cymen Crick's avatar

Cymen Crick

Rankers Owner

Norwest Adventures

Valid Reviews

35 Valid Reviews

The Norwest Adventures experience has a total of 36 reviews. There are 35 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 35 valid reviews:

Rating Count Percentage
10/10 21
9/10 6
8/10 1
7/10 4
6/10 1
5/10 1
4/10 1
3/10 0
2/10 0
1/10 0

90.00% Average

The raw data average (mean) for all the Norwest Adventures valid reviews is 90.00% and is based on 35 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

19 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 35 valid reviews, the experience has 19 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 19 face-to-face reviews:

Rating Count Percentage
10/10 11
9/10 4
8/10 1
7/10 2
6/10 0
5/10 0
4/10 1
3/10 0
2/10 0
1/10 0

90.53% Average

The raw data average (mean) for all the Norwest Adventures face-to-face reviews is 90.53% and is based on 19 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
Ingrid 10/10 408 days 100%
Mike Fricker 5/10 1412 days 5%
S H 10/10 1777 days 5%
Mietta Feery 9/10 1998 days 4%
Michelle Dalgliesh 10/10 2172 days 4%
Karin Karlsson 10/10 2344 days 3%
Katharina Block 8/10 2712 days 2%
Annika Fletemeyer 9/10 2712 days 2%
techno69 10/10 2873 days 2%
Yiying Zhang 10/10 2934 days 2%
Markus Eckert 10/10 3083 days 1%
Philip Schumann 10/10 3083 days 1%
Jason MacLeod 7/10 3115 days 1%
Kim 10/10 3421 days 1%
Ingeborg Ruysscher 10/10 3511 days 0%
Lydia Holleman 10/10 3533 days 0%
Stephanie Levepue 9/10 3546 days 0%
Loesje 7/10 3633 days 0%
Sethkins 10/10 3817 days 1%
Stephanie Wirthlin 4/10 3840 days 1%
hands 6/10 3877 days 1%
Gunter 10/10 4166 days 1%
Seonaid 10/10 4183 days 1%
Suz 10/10 4273 days 1%
Anna 10/10 4466 days 1%
Jeannot Robert 10/10 4586 days 1%
rosil 7/10 4882 days 1%
Martina Bumiller 10/10 4887 days 1%
Stefanie 7/10 4907 days 1%
Nikki Annand 9/10 5003 days 1%
Linda and Peter 9/10 5261 days 1%
Klaus Uhl 10/10 5265 days 1%
Fung 10/10 5274 days 1%
Charles Price 10/10 5286 days 1%
Sue 9/10 5286 days 1%


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 Norwest Adventures experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-2.26% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 116 days. However the Norwest Adventures 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 Norwest Adventures experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -2.23%
198 -2.24%
199 -2.25%
200 -2.26%
201 -2.27%
202 -2.29%
203 -2.30%

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.