G'day, 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 Hertz Rent a Car.
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.
Hertz Rent a Car
Valid Reviews
40 Valid Reviews
The Hertz Rent a Car experience has a total of 44 reviews. There are 40 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.
Below is the distribution of ratings for the 40 valid reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 2 |
|
5% |
| 9/10 | 8 |
|
20% |
| 8/10 | 9 |
|
23% |
| 7/10 | 2 |
|
5% |
| 6/10 | 2 |
|
5% |
| 5/10 | 0 |
|
0% |
| 4/10 | 0 |
|
0% |
| 3/10 | 1 |
|
3% |
| 2/10 | 3 |
|
8% |
| 1/10 | 13 |
|
33% |
53.00% Average
The raw data average (mean) for all the Hertz Rent a Car valid reviews is 53.00% and is based on 40 valid reviews. This value is not used to calculate the ranking score and it only provided here as a comparison to the weighted average.
Face-to-Face Reviews
21 Face-to-Face Reviews
The Rankers team meets with travellers while they’re in New Zealand and conducts face-to-face surveys. These reviews, in our opinion, are the most trusted in the industry and represent a critical control sample. To our knowledge, we are the only travel review website in the world that has gone to this extent.
More about face-to-face reviews
Within the 40 valid reviews, the experience has 21 face-to-face reviews collected during interviews by our team.
Below is the distribution of ratings for the 21 face-to-face reviews:
| Rating | Count | Percentage | |
|---|---|---|---|
| 10/10 | 2 |
|
10% |
| 9/10 | 8 |
|
38% |
| 8/10 | 9 |
|
43% |
| 7/10 | 2 |
|
10% |
| 6/10 | 0 |
|
0% |
| 5/10 | 0 |
|
0% |
| 4/10 | 0 |
|
0% |
| 3/10 | 0 |
|
0% |
| 2/10 | 0 |
|
0% |
| 1/10 | 0 |
|
0% |
84.76% Average
The raw data average (mean) for all the Hertz Rent a Car face-to-face reviews is 84.76% and is based on 21 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.
Weighted Average
22.58%
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 |
|---|---|---|---|
| Claire | 1/10 | 511 days | 89% |
| Viv | 2/10 | 511 days | 100% |
| Khan | 1/10 | 602 days | 83% |
| Beware! Don't use Hertz! | 1/10 | 1026 days | 43% |
| Monique | 1/10 | 1363 days | 18% |
| Disappointed | 1/10 | 1697 days | 6% |
| Rory K | 1/10 | 2002 days | 5% |
| Milan | 1/10 | 2033 days | 5% |
| Ely | 1/10 | 2063 days | 5% |
| Leah | 1/10 | 2122 days | 5% |
| Kyla | 1/10 | 2275 days | 4% |
| A very grumpy customer | 1/10 | 2428 days | 4% |
| Ashley Butler | 8/10 | 2828 days | 8% |
| Saili Shah | 2/10 | 3158 days | 3% |
| Megan Anonymous | 1/10 | 3249 days | 2% |
| bob marshall | 2/10 | 3555 days | 2% |
| Tris Sol | 1/10 | 3645 days | 1% |
| Patricia Erni | 9/10 | 3898 days | 2% |
| Manuel Bleiker | 9/10 | 3898 days | 2% |
| John Adams | 6/10 | 4344 days | 0% |
| yardley54 | 3/10 | 4375 days | 0% |
| Frank Band | 8/10 | 4654 days | 3% |
| David & Sue Lokkerbol | 8/10 | 4665 days | 3% |
| Urban Reifler | 9/10 | 4690 days | 3% |
| Dane & Julz | 7/10 | 5015 days | 2% |
| Valerie | 9/10 | 5030 days | 3% |
| Angela Stringer | 6/10 | 5440 days | 2% |
| Steve | 8/10 | 5722 days | 3% |
| DimitriD | 8/10 | 5732 days | 3% |
| InkenGermany | 9/10 | 5757 days | 3% |
| Sid | 9/10 | 5856 days | 3% |
| Fothergill | 10/10 | 5922 days | 3% |
| Corinne Henville | 9/10 | 6091 days | 3% |
| Roger Mills | 9/10 | 6158 days | 3% |
| Dorris Schwarz | 8/10 | 6161 days | 3% |
| Anu | 8/10 | 6161 days | 3% |
| Connor | 10/10 | 6184 days | 3% |
| lawrence Walker | 8/10 | 6189 days | 3% |
| Ard | 8/10 | 6190 days | 3% |
| Detlef | 7/10 | 6459 days | 2% |
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 Hertz Rent a Car experience has plenty of reviews and does not meet the criteria for any adjustment.
Recent Reviews Adjustment
-7.06% 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 43 days. The Hertz Rent a Car 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 Hertz Rent a Car experience has been adjusted for 200 days. Adjustments are according to the following table.
| Days | Adjustment |
|---|---|
| … | … |
| 197 | -4.00% |
| 198 | -4.02% |
| 199 | -4.04% |
| 200 | -4.06% |
| 201 | -4.08% |
| 202 | -4.10% |
| 203 | -4.12% |
| … | … |
Balancing Adjustment
33.36% 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
49%
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.