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 NZ Discount Car Rentals Limited.

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

NZ Discount Car Rentals Limited

Valid Reviews

38 Valid Reviews

The NZ Discount Car Rentals Limited experience has a total of 40 reviews. There are 38 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.

Within these 38 valid reviews, the experience has 1 face-to-face review collected during interviews by our team.

Below is the distribution of ratings for the 38 valid reviews:

Rating Count Percentage
10/10 34
89%
9/10 2
5%
8/10 1
3%
7/10 0
0%
6/10 0
0%
5/10 0
0%
4/10 0
0%
3/10 0
0%
2/10 0
0%
1/10 1
3%

96.58% Average

The raw data average (mean) for all the NZ Discount Car Rentals Limited valid reviews is 96.58% and is based on 38 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

85.07%

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
Paul Bradfield 1/10 318 days 61.3 79%
Trevor S 10/10 380 days 77.12 100%
Ian 10/10 532 days 55.15 71%
Kerry 10/10 593 days 44.93 57%
Alison 10/10 683 days 31.9 40%
Kim Smith 10/10 958 days 7.97 8%
Elaine Yang 10/10 1262 days 4.67 3%
Mark Ma 10/10 1262 days 4.67 3%
Lixia Ren 10/10 1323 days 4.55 3%
Gerbrand Smidt 10/10 1368 days true 4.47 3%
Ray Freeman 10/10 1414 days 4.38 3%
Graeme Farmer 10/10 1444 days 4.32 3%
Alan Casey 10/10 1536 days 4.14 3%
Mike 10/10 1689 days 3.84 2%
John Calder 10/10 1689 days 3.84 2%
Derek 8/10 1750 days 3.53 2%
Greg Ross 9/10 1779 days 3.66 2%
Huei Lai 10/10 1809 days 3.6 2%
Robert Warner 10/10 1809 days 3.6 2%
peter hicks 9/10 1993 days 3.24 1%
Shelley DAVIE 10/10 1993 days 3.24 1%
Dean Rooke 10/10 1993 days 3.24 1%
aussieastrogirl 10/10 2236 days 2.77 1%
Sara Lynam 10/10 2327 days 2.59 1%
Franklin Wu 10/10 2358 days 2.53 0%
Noel Bartley 10/10 2388 days 2.47 0%
Neill O'REILLY 10/10 2419 days 2.41 0%
Phillip Johnson 10/10 2419 days 2.41 0%
Angela Caldin 10/10 2450 days 2.35 0%
Dennis Hogan 10/10 2450 days 2.35 0%
Melijuampi 10/10 2450 days 2.35 0%
Glynne Suckling 10/10 2450 days 2.35 0%
Elaine Vreeling 10/10 2540 days 2.17 0%
kelvin_P 10/10 2540 days 2.17 0%
Mandy Herron 10/10 2540 days 2.17 0%
Diane8 10/10 2540 days 2.17 0%
Ken Leaming 10/10 2540 days 2.17 0%
panda33 10/10 2540 days 2.17 0%

Adjustments

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 NZ Discount Car Rentals Limited 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 NZ Discount Car Rentals Limited 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 NZ Discount Car Rentals Limited 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

78%

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.