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 Drive NZ Rental Vehicles.

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

Drive NZ Rental Vehicles

Valid Reviews

52 Valid Reviews

The Drive NZ Rental Vehicles experience has a total of 55 reviews. There are 52 valid reviews that are included when calculating the ranking score and 3 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 52 valid reviews, the experience has 3 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 52 valid reviews:

Rating Count Percentage
10/10 14
9/10 10
8/10 4
7/10 1
6/10 0
5/10 0
4/10 0
3/10 1
2/10 0
1/10 22

56.54% Average

The raw data average (mean) for all the Drive NZ Rental Vehicles valid reviews is 56.54% and is based on 52 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 Relative Weight
Erica L 1/10 357 days 100%
Max 1/10 357 days 100%
Pip Summerville 1/10 449 days 85%
Never Again 1/10 541 days 67%
Nikki Schumaker 1/10 572 days 61%
raymond bennett 1/10 633 days 49%
Alan Manson 3/10 663 days 46%
Kevin Holland 1/10 663 days 43%
SeanB 1/10 722 days 34%
Ulrich Ackermann 1/10 722 days 34%
Tim 1/10 753 days 29%
Shiven 1/10 906 days 13%
Ian from Brisbane 9/10 906 days 18%
Julie 1/10 1059 days 7%
Hayley Pullyn 10/10 1087 days 9%
Chelsea 1/10 1087 days 6%
Dan Turner 10/10 1149 days 8%
Ingrid Johansen 1/10 1210 days 6%
Ellie Cumming 1/10 1302 days 6%
Bo Yang 10/10 1332 days 8%
Clinton Whyte 1/10 1483 days 5%
Sam Aussie 1/10 1483 days 5%
Christine Young 10/10 1758 days 6%
DanielNZ 1/10 1789 days 5%
Michael NZ 10/10 1789 days 6%
Cameron Jeal 8/10 1877 days 3%
Kylie May 9/10 1910 days 6%
Keely Laycock 1/10 1910 days 4%
Bette Middly 9/10 1910 days 6%
Ian Bright 10/10 2063 days 5%
Jean L 9/10 2183 days 5%
Nick Masters 1/10 2245 days 3%
WellyTourist 1/10 2245 days 3%
gordygreenbat 10/10 3463 days 1%
TonyN 8/10 3463 days 1%
Quantum 9/10 3463 days 1%
DavidS 10/10 3463 days 1%
jules012 10/10 3463 days 1%
NBartosh 10/10 3463 days 1%
VickiR 10/10 3463 days 1%
rgb 10/10 3463 days 1%
rogb 9/10 3463 days 1%
kawasaki69 10/10 3494 days 1%
cordwell 10/10 3494 days 1%
brianpatrick 9/10 3616 days 0%
Ross Hughes 8/10 3635 days 0%
steelreserve 9/10 3644 days 0%
fumba 9/10 3675 days 2%
Chris_Hazel 8/10 3706 days 2%
Paul Frew 9/10 4018 days 1%
hogey74 7/10 4071 days 2%
JustATraveller 1/10 4397 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 Drive NZ Rental Vehicles experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-7.11% 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.

What constitutes a recent review is based on the how old it is, what type of experience it is applied to and and what time of year it currently is. Due to the seasonal nature of many businesses, what is considered recent is dynamically adjusted throughout the year.

There may be an adjustment if this experience hasn't received enough reviews within the last 48 days. The Drive NZ Rental Vehicles 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 200 days. Due to the seasonal nature of many businesses, this adjustment is applied dynamically throughout the year.

The Drive NZ Rental Vehicles experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -4.05%
198 -4.07%
199 -4.09%
200 -4.11%
201 -4.13%
202 -4.16%
203 -4.18%

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.