Ranking Score Explained

Hey, 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 Kelly Tarlton's Antarctic Encounter and Underwater World.

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.

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Cymen Crick

Rankers Owner

Kelly Tarlton's Antarctic Encounter and Underwater World

Valid Reviews

44 Valid Reviews

The Kelly Tarlton's Antarctic Encounter and Underwater World experience has a total of 45 reviews. There are 44 valid reviews that are included when calculating the ranking score and 1 invalid review 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 44 valid reviews:

Rating Count Percentage
10/10 4
9%
9/10 9
20%
8/10 7
16%
7/10 8
18%
6/10 4
9%
5/10 5
11%
4/10 4
9%
3/10 3
7%
2/10 0
0%
1/10 0
0%

69.77% Average

The raw data average (mean) for all the Kelly Tarlton's Antarctic Encounter and Underwater World valid reviews is 69.77% and is based on 44 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

35 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 44 valid reviews, the experience has 35 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 35 face-to-face reviews:

Rating Count Percentage
10/10 2
6%
9/10 9
26%
8/10 6
17%
7/10 7
20%
6/10 3
9%
5/10 4
11%
4/10 3
9%
3/10 1
3%
2/10 0
0%
1/10 0
0%

71.71% Average

The raw data average (mean) for all the Kelly Tarlton's Antarctic Encounter and Underwater World face-to-face reviews is 71.71% and is based on 35 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.

Weighted Average

72.72%

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
Frederik Fuchs 7/10 3036 days 100%
Xavier Bistodeau 5/10 3303 days 59%
Garry Renton 8/10 3985 days 18%
Jessie Sabine 6/10 4028 days 10%
David Embling 5/10 4045 days 5%
Cindy Bonton 4/10 4076 days 0%
Adam Critchley 5/10 4765 days 18%
Lilja Bjork Hermannsdottir 7/10 4767 days 26%
Remy van Heugten 7/10 4767 days 26%
hendrik king 7/10 4830 days 26%
Tsmith 6/10 4982 days 23%
Andreas Rath 4/10 5090 days 13%
M Holierhoek 8/10 5107 days 29%
Jarob Brezigar 8/10 5126 days 29%
Michael Eck 5/10 5126 days 18%
winglim 5/10 5377 days 18%
Candyfloss 10/10 5408 days 30%
Mr and Mrs Scott 10/10 5470 days 30%
Wender Jakoleseu 6/10 5472 days 23%
Ake Erlandsson 10/10 5494 days 30%
_mel_ 3/10 5529 days 8%
Anita de Boer 8/10 5562 days 29%
Neil 10/10 5731 days 30%
RolandV 8/10 5787 days 29%
Mikey 9/10 5809 days 29%
RichardE 9/10 5839 days 29%
Lars 7/10 5871 days 26%
stephanie 9/10 5908 days 29%
melissa 9/10 5929 days 29%
Ben 7/10 5978 days 26%
Michelle 9/10 5978 days 29%
Liz Brown 8/10 6140 days 29%
Kori Barton 9/10 6145 days 29%
Toni Keown 4/10 6159 days 13%
Myrtille de Vries 7/10 6208 days 26%
Haemnerli 6/10 6209 days 23%
Hans Olthof 9/10 6247 days 29%
Christin 4/10 6294 days 13%
Rob Boston 3/10 6352 days 8%
Kristine 3/10 6515 days 8%
Helen 8/10 6521 days 29%
Nancy Bill 9/10 6527 days 29%
Herman&Ineke 9/10 6573 days 29%
Suzy 7/10 6574 days 26%

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 Kelly Tarlton's Antarctic Encounter and Underwater World experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-4.14% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 53 days. However the Kelly Tarlton's Antarctic Encounter and Underwater World experience does not meet the criteria for any adjustment.

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 Kelly Tarlton's Antarctic Encounter and Underwater World experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -4.08%
198 -4.10%
199 -4.12%
200 -4.14%
201 -4.16%
202 -4.19%
203 -4.21%

Balancing Adjustment

7.83% 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

76%

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.