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 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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Nick Morrison

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

64.70%

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 Face-to-Face Weight Relative Weight
Frederik Fuchs 7/10 1087 days true 4.56 100%
Xavier Bistodeau 5/10 1354 days true 3.69 81%
Garry Renton 8/10 2036 days true 3.22 71%
Jessie Sabine 6/10 2079 days true 2.75 60%
David Embling 5/10 2096 days true 2.66 58%
Cindy Bonton 4/10 2127 days true 2.55 56%
Adam Critchley 5/10 2816 days true 1.66 36%
Lilja Bjork Hermannsdottir 7/10 2818 days true 1.87 41%
Remy van Heugten 7/10 2818 days true 1.87 41%
hendrik king 7/10 2881 days 1.77 39%
Tsmith 6/10 3034 days 1.39 31%
Andreas Rath 4/10 3141 days true 1.18 26%
M Holierhoek 8/10 3158 days true 1.39 31%
Jarob Brezigar 8/10 3177 days true 1.36 30%
Michael Eck 5/10 3177 days true 1.16 25%
winglim 5/10 3429 days 0.81 18%
Candyfloss 10/10 3460 days 0.95 21%
Mr and Mrs Scott 10/10 3521 days 0.85 19%
Wender Jakoleseu 6/10 3523 days true 0.7 15%
Ake Erlandsson 10/10 3545 days true 0.8 18%
_mel_ 3/10 3580 days 0.57 13%
Anita de Boer 8/10 3613 days true 0.65 14%
Neil 10/10 3783 days true 0.4 9%
RolandV 8/10 3839 days true 0.29 6%
Mikey 9/10 3860 days true 0.27 6%
RichardE 9/10 3890 days true 0.21 5%
Lars 7/10 3922 days true 0.14 3%
stephanie 9/10 3959 days true 0.1 2%
melissa 9/10 3980 days true 0.06 1%
Ben 7/10 4029 days true 0.0 0%
Michelle 9/10 4029 days true 0.0 0%
Liz Brown 8/10 4191 days 0.0 0%
Kori Barton 9/10 4197 days true 0.0 0%
Toni Keown 4/10 4210 days 0.0 0%
Myrtille de Vries 7/10 4259 days true 0.0 0%
Haemnerli 6/10 4260 days true 0.0 0%
Hans Olthof 9/10 4298 days true 0.0 0%
Christin 4/10 4345 days true 0.0 0%
Rob Boston 3/10 4403 days 0.0 0%
Kristine 3/10 4567 days true 0.0 0%
Helen 8/10 4573 days true 0.0 0%
Nancy Bill 9/10 4579 days true 0.0 0%
Herman&Ineke 9/10 4624 days true 0.0 0%
Suzy 7/10 4625 days true 0.0 0%

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

-3.98% Adjustment

There may be an adjustment if an experience hasn't received any reviews within the last 60 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 199 days.

The Kelly Tarlton's Antarctic Encounter and Underwater World experience has been adjusted for 199 days. Adjustments are according to the following table.

Days Adjustment
196 -3.92%
197 -3.94%
198 -3.96%
199 -3.98%
200 -4.00%
201 -4.02%
202 -4.04%

Final Ranking Score

61%

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.