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 The National Aquarium of New Zealand.

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

The National Aquarium of New Zealand

Valid Reviews

38 Valid Reviews

The The National Aquarium of New Zealand experience has a total of 39 reviews. There are 38 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 38 valid reviews:

Rating Count Percentage
10/10 4
11%
9/10 8
21%
8/10 9
24%
7/10 5
13%
6/10 4
11%
5/10 4
11%
4/10 2
5%
3/10 2
5%
2/10 0
0%
1/10 0
0%

72.89% Average

The raw data average (mean) for all the The National Aquarium of New Zealand valid reviews is 72.89% and is based on 38 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 38 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 4
11%
9/10 8
23%
8/10 7
20%
7/10 4
11%
6/10 4
11%
5/10 4
11%
4/10 2
6%
3/10 2
6%
2/10 0
0%
1/10 0
0%

72.57% Average

The raw data average (mean) for all the The National Aquarium of New Zealand face-to-face reviews is 72.57% 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

73.99%

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
Michael Bley 5/10 904 days true 12.94 100%
Claudia Hobbs 9/10 925 days true 11.5 89%
Michael 8/10 951 days true 9.94 76%
Suzannah Hill 9/10 958 days true 9.57 73%
Selma Franke 9/10 993 days true 7.98 61%
Benjamin Schyler 4/10 1205 days true 5.48 41%
Thomas Michel 9/10 1210 days true 5.81 43%
Hana Rachfalik 8/10 1229 days 4.82 35%
Tim Ronke 10/10 1239 days true 5.76 43%
Maxim Motheus 5/10 1262 days true 5.73 43%
Brennan Jungling 8/10 1276 days true 5.7 42%
Anita Wallace 8/10 1276 days true 5.7 42%
Flora Kiessling 5/10 1283 days true 5.69 42%
Mattias 7/10 1940 days true 4.61 34%
Pavel Macek 8/10 1940 days true 4.61 34%
Friederike Kranzin 6/10 1976 days true 4.55 33%
Sophia 6/10 1986 days true 4.54 33%
Melissa Hermansson 7/10 1996 days true 4.52 33%
Maxime 3/10 2346 days true 3.65 26%
Lis Bon 8/10 2362 days 3.26 23%
Darina Kvasnicova 9/10 2701 days true 3.36 24%
Johann Maier 10/10 2712 days true 3.34 24%
Leander Siegert 7/10 2726 days true 3.32 23%
Remco te Lintum 10/10 2806 days true 3.19 22%
Bob & Lynda Miller 9/10 3059 days true 2.77 19%
Wender Jakoleseu 9/10 3432 days true 2.16 14%
Anna 5/10 3528 days true 2.0 13%
Katharina 8/10 3768 days true 1.61 10%
Christian Troendle 6/10 3770 days true 1.6 10%
Tanya 4/10 3781 days true 1.49 9%
Marlena 10/10 3787 days true 1.57 10%
VictoriaH 7/10 3799 days true 1.56 9%
Kellie Teichmann 7/10 4064 days 0.93 5%
Tobias Rahm 6/10 4169 days true 0.95 5%
Linda 3/10 4245 days true 0.76 3%
Manuel 8/10 4253 days true 0.81 4%
Christin 9/10 4254 days true 0.81 4%
Rietveld 8/10 4522 days true 0.37 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 The National Aquarium of New Zealand experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-7.28% Adjustment

There may be an adjustment if an experience hasn't received any reviews within the last 60 days. However the The National Aquarium of New Zealand 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 364 days.

The The National Aquarium of New Zealand experience has been adjusted for 364 days. Adjustments are according to the following table.

Days Adjustment
361 -7.22%
362 -7.24%
363 -7.26%
364 -7.28%
365 -7.30%
366 -7.32%
367 -7.34%

Final Ranking Score

67%

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.