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 Koha Experience.

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

Koha Experience

Valid Reviews

24 Valid Reviews

The Koha Experience experience has a total of 25 reviews. There are 24 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.

Within these 24 valid reviews, the experience has 1 face-to-face review collected during interviews by our team.

Below is the distribution of ratings for the 24 valid reviews:

Rating Count Percentage
10/10 24
9/10 0
8/10 0
7/10 0
6/10 0
5/10 0
4/10 0
3/10 0
2/10 0
1/10 0

100.00% Average

The raw data average (mean) for all the Koha Experience valid reviews is 100.00% and is based on 24 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
Pat Burns 10/10 49 days 99.62 100%
Emma and Ray 10/10 77 days 99.06 99%
Pieter & Inge 10/10 108 days 98.15 98%
Geertje and Rein 10/10 108 days 98.15 98%
ian kennedy 10/10 169 days 95.47 96%
Charlie and Michelle 10/10 230 days 91.62 92%
Jill McGrath 10/10 437 days true 83.69 83%
Patricia, Norbert, Sam and Jo 10/10 442 days 69.04 68%
Adrian Trumper 10/10 442 days 69.04 68%
Sjoerd Tolsma 10/10 757 days 23.1 19%
Dirk Wolf 10/10 768 days 21.94 18%
Laura Brown 10/10 777 days 21.02 17%
Tobias Hollerith 10/10 783 days 20.43 16%
Yoana Gospodinova 10/10 838 days 15.47 11%
Chadd Holland 10/10 1115 days 4.97 0%
Peter Kozlik 10/10 1130 days 4.95 0%
magdalena gomez haedo 10/10 1170 days 4.9 0%
Amala Martin 10/10 1170 days 4.9 0%
Steve Newton 10/10 1173 days 4.89 0%
Frederik Lambrecht 10/10 1190 days 4.87 0%
Stefanie Giese 10/10 1193 days 4.87 0%
Matthew Hallowell 10/10 1201 days 4.85 0%
Chalie Dotesek 10/10 1223 days 4.82 0%
Jitka Hruskova 10/10 1235 days 4.81 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 Koha Experience experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-0.04% Adjustment

There may be an adjustment if an experience hasn't received any reviews within the last 60 days. However the Koha Experience 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 Koha Experience experience has been adjusted for 2 days. Adjustments are according to the following table.

Days Adjustment
0 -0.00%
1 -0.02%
2 -0.04%
3 -0.06%
4 -0.08%
5 -0.10%

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.

Love Christchurch