Hi, 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.
Drive NZ Rental Vehicles
Valid Reviews
61 Valid Reviews
The Drive NZ Rental Vehicles experience has a total of 67 reviews. There are 61 valid reviews that are included when calculating the ranking score and 6 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 61 valid reviews, the experience has 3 face-to-face reviews collected during interviews by our team.
Below is the distribution of ratings for the 61 valid reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 15 |
|
25% |
| 9/10 | 10 |
|
16% |
| 8/10 | 4 |
|
7% |
| 7/10 | 1 |
|
2% |
| 6/10 | 0 |
|
0% |
| 5/10 | 0 |
|
0% |
| 4/10 | 0 |
|
0% |
| 3/10 | 1 |
|
2% |
| 2/10 | 0 |
|
0% |
| 1/10 | 30 |
|
49% |
51.15% Average
The raw data average (mean) for all the Drive NZ Rental Vehicles valid reviews is 51.15% and is based on 61 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
32.51%
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 |
|---|---|---|---|
| D&K | 1/10 | 220 days | 100% |
| Jay | 1/10 | 1196 days | 28% |
| Christopher Akroyd | 1/10 | 1287 days | 22% |
| James | 1/10 | 1347 days | 18% |
| Kate | 1/10 | 1378 days | 17% |
| Mike Paterson | 10/10 | 1896 days | 12% |
| Clintpurches@msn.com | 1/10 | 1926 days | 5% |
| Felicity | 1/10 | 1957 days | 5% |
| Jane Bilik | 1/10 | 2108 days | 4% |
| Erica L | 1/10 | 2412 days | 4% |
| Max | 1/10 | 2412 days | 4% |
| Pip Summerville | 1/10 | 2504 days | 4% |
| Never Again | 1/10 | 2596 days | 3% |
| Nikki Schumaker | 1/10 | 2627 days | 3% |
| raymond bennett | 1/10 | 2688 days | 3% |
| Alan Manson | 3/10 | 2718 days | 4% |
| Kevin Holland | 1/10 | 2718 days | 3% |
| SeanB | 1/10 | 2777 days | 3% |
| Ulrich Ackermann | 1/10 | 2777 days | 3% |
| Tim | 1/10 | 2808 days | 3% |
| Shiven | 1/10 | 2961 days | 3% |
| Ian from Brisbane | 9/10 | 2961 days | 7% |
| Julie | 1/10 | 3114 days | 2% |
| Hayley Pullyn | 10/10 | 3142 days | 6% |
| Chelsea | 1/10 | 3142 days | 2% |
| Dan Turner | 10/10 | 3204 days | 6% |
| Ingrid Johansen | 1/10 | 3264 days | 2% |
| Ellie Cumming | 1/10 | 3356 days | 2% |
| Bo Yang | 10/10 | 3386 days | 5% |
| Clinton Whyte | 1/10 | 3537 days | 2% |
| Sam Aussie | 1/10 | 3537 days | 2% |
| Christine Young | 10/10 | 3812 days | 3% |
| DanielNZ | 1/10 | 3843 days | 1% |
| Michael NZ | 10/10 | 3843 days | 3% |
| Cameron Jeal | 8/10 | 3932 days | 1% |
| Kylie May | 9/10 | 3964 days | 2% |
| Keely Laycock | 1/10 | 3965 days | 1% |
| Bette Middly | 9/10 | 3965 days | 2% |
| Ian Bright | 10/10 | 4117 days | 1% |
| Jean L | 9/10 | 4237 days | 1% |
| Nick Masters | 1/10 | 4299 days | 0% |
| WellyTourist | 1/10 | 4299 days | 0% |
| gordygreenbat | 10/10 | 5518 days | 2% |
| TonyN | 8/10 | 5518 days | 2% |
| Quantum | 9/10 | 5518 days | 2% |
| DavidS | 10/10 | 5518 days | 2% |
| jules012 | 10/10 | 5518 days | 2% |
| NBartosh | 10/10 | 5518 days | 2% |
| VickiR | 10/10 | 5518 days | 2% |
| rgb | 10/10 | 5518 days | 2% |
| rogb | 9/10 | 5518 days | 2% |
| kawasaki69 | 10/10 | 5549 days | 2% |
| cordwell | 10/10 | 5549 days | 2% |
| brianpatrick | 9/10 | 5671 days | 2% |
| Ross Hughes | 8/10 | 5690 days | 1% |
| steelreserve | 9/10 | 5699 days | 2% |
| fumba | 9/10 | 5730 days | 2% |
| Chris_Hazel | 8/10 | 5761 days | 2% |
| Paul Frew | 9/10 | 6073 days | 1% |
| hogey74 | 7/10 | 6126 days | 2% |
| JustATraveller | 1/10 | 6452 days | 1% |
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 Drive NZ Rental Vehicles experience has plenty of reviews and does not meet the criteria for any adjustment.
Recent Reviews Adjustment
-5.12% 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 85 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 | -2.63% |
| 2 | -1.50% |
| 3 | -0.38% |
| 4 | -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 152 days. Adjustments are according to the following table.
| Days | Adjustment |
|---|---|
| … | … |
| 149 | -2.07% |
| 150 | -2.09% |
| 151 | -2.10% |
| 152 | -2.12% |
| 153 | -2.13% |
| 154 | -2.14% |
| 155 | -2.16% |
| … | … |
Balancing Adjustment
33.50% Adjustment
Every experience's review score is adjusted to balance out the disproportional number of negative reviews that are contributed.
You won't be surprised to learn that disgruntled customers are more likely to leave a review than happy ones. They are motivated to share their experience and warn others. We consider this a good thing and it's why reading the reviews is important. However we've learned it can misrepresent the experience in a more overall sense.
We apply a balancing adjustment to counteract this effect and ensure the ranking score is a more fair representation of the experience. This adjustment is applied equally to all experiences.
Final Ranking Score
61%
The final ranking score once any adjustments, ratings, and rounding has been applied. This value is recalculated each day and a short rolling average is applied. Therefore it may not be precisely accurate based on the other values presented.