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 Wai Hire Cars.

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

Wai Hire Cars

Valid Reviews

20 Valid Reviews

The Wai Hire Cars experience has a total of 22 reviews. There are 20 valid reviews that are included when calculating the ranking score and 2 invalid reviews 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 20 valid reviews:

Rating Count Percentage
10/10 18
9/10 1
8/10 0
7/10 0
6/10 0
5/10 0
4/10 0
3/10 0
2/10 0
1/10 1

95.00% Average

The raw data average (mean) for all the Wai Hire Cars valid reviews is 95.00% and is based on 20 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
Tanya Snowden 10/10 1352 days 4.56 100%
David H 1/10 1443 days 3.22 0%
Andrew Braun 10/10 1504 days 4.3 81%
Helena Miles 10/10 1504 days 4.3 81%
Henry Lim 10/10 1535 days 4.25 77%
Nicholas W 10/10 1566 days 4.19 73%
Monique Kerrisk 10/10 1657 days 4.04 61%
Cathy O'Shea 10/10 1657 days 4.04 61%
Gareth McMiles 10/10 1658 days 4.04 61%
Brian McKinlay 10/10 1688 days 3.98 57%
Thomas 10/10 1716 days 3.94 54%
Laura Harris 10/10 1747 days 3.88 50%
Jason Panett 10/10 1808 days 3.78 42%
Olivia Milton 10/10 1839 days 3.73 38%
Dawn Simmons 10/10 1839 days 3.73 38%
Owen S. Ley 10/10 1839 days 3.73 38%
Hollis Heidelberg 10/10 1839 days 3.73 38%
Arthur Garland 10/10 1869 days 3.67 34%
Jo Clare 10/10 1869 days 3.67 34%
Ben Brockway 9/10 1900 days 3.62 30%


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 Wai Hire Cars experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-6.98% Adjustment

Recent reviews reflect the experience as it currently operates. This means it's important to get fresh reviews. Some experiences discovered they could get a few good reviews and then, resting on their laurels, discourage any further reviews. This adjustment stimulates experiences to be positively involved in the review generating process and discourages them from manipulating the ranking system in this manner. There may be an adjustment if an experience hasn't received any reviews within the last 60 days.

The Wai Hire Cars experience has 0 recent rankings. Adjustments are according to the following table:

Recent Reviews Adjustment
0 -3.00%
1 -2.83%
2 -2.33%
3 -1.50%
4 -0.67%
5 -0.17%
6 -0.00%

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 199 days.

The Wai Hire Cars experience has been adjusted for 199 days. Adjustments are according to the following table.

Days Adjustment
196 -3.92%
197 -3.94%
198 -3.96%
199 -3.98%
200 -4.00%
201 -4.02%
202 -4.04%

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.