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

55 Valid Reviews

The Drive NZ Rental Vehicles experience has a total of 59 reviews. There are 55 valid reviews that are included when calculating the ranking score and 4 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 55 valid reviews, the experience has 3 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 55 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 25

54.00% Average

The raw data average (mean) for all the Drive NZ Rental Vehicles valid reviews is 54.00% and is based on 55 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
Clintpurches@msn.com 1/10 12 days 100%
Felicity 1/10 43 days 100%
Jane Bilik 1/10 194 days 94%
Erica L 1/10 498 days 61%
Max 1/10 498 days 61%
Pip Summerville 1/10 590 days 45%
Never Again 1/10 682 days 32%
Nikki Schumaker 1/10 713 days 28%
raymond bennett 1/10 774 days 21%
Alan Manson 3/10 804 days 19%
Kevin Holland 1/10 804 days 18%
SeanB 1/10 863 days 13%
Ulrich Ackermann 1/10 863 days 13%
Tim 1/10 894 days 11%
Shiven 1/10 1047 days 5%
Ian from Brisbane 9/10 1047 days 7%
Julie 1/10 1200 days 5%
Hayley Pullyn 10/10 1228 days 6%
Chelsea 1/10 1228 days 5%
Dan Turner 10/10 1290 days 6%
Ingrid Johansen 1/10 1350 days 4%
Ellie Cumming 1/10 1442 days 4%
Bo Yang 10/10 1472 days 6%
Clinton Whyte 1/10 1623 days 4%
Sam Aussie 1/10 1623 days 4%
Christine Young 10/10 1898 days 5%
DanielNZ 1/10 1929 days 3%
Michael NZ 10/10 1929 days 5%
Cameron Jeal 8/10 2018 days 2%
Kylie May 9/10 2050 days 4%
Keely Laycock 1/10 2051 days 3%
Bette Middly 9/10 2051 days 4%
Ian Bright 10/10 2203 days 4%
Jean L 9/10 2323 days 4%
Nick Masters 1/10 2385 days 2%
WellyTourist 1/10 2385 days 2%
gordygreenbat 10/10 3604 days 0%
TonyN 8/10 3604 days 0%
Quantum 9/10 3604 days 0%
DavidS 10/10 3604 days 0%
jules012 10/10 3604 days 0%
NBartosh 10/10 3604 days 0%
VickiR 10/10 3604 days 0%
rgb 10/10 3604 days 0%
rogb 9/10 3604 days 0%
kawasaki69 10/10 3635 days 0%
cordwell 10/10 3635 days 0%
brianpatrick 9/10 3757 days 1%
Ross Hughes 8/10 3776 days 1%
steelreserve 9/10 3785 days 1%
fumba 9/10 3816 days 1%
Chris_Hazel 8/10 3847 days 1%
Paul Frew 9/10 4159 days 1%
hogey74 7/10 4212 days 1%
JustATraveller 1/10 4538 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

-1.53% 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 114 days. The Drive NZ Rental Vehicles experience has 3 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 3 days. Adjustments are according to the following table.

Days Adjustment
0 -0.00%
1 -0.01%
2 -0.02%
3 -0.03%
4 -0.04%
5 -0.06%
6 -0.07%

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.