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 Southern Discoveries / Milford Sound Red Boats.

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

Southern Discoveries / Milford Sound Red Boats

Valid Reviews

74 Valid Reviews

The Southern Discoveries / Milford Sound Red Boats experience has a total of 74 valid reviews. There are no 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 74 valid reviews:

Rating Count Percentage
10/10 21
28%
9/10 28
38%
8/10 10
14%
7/10 14
19%
6/10 0
0%
5/10 0
0%
4/10 0
0%
3/10 1
1%
2/10 0
0%
1/10 0
0%

86.89% Average

The raw data average (mean) for all the Southern Discoveries / Milford Sound Red Boats valid reviews is 86.89% and is based on 74 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

69 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 74 valid reviews, the experience has 69 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 69 face-to-face reviews:

Rating Count Percentage
10/10 17
25%
9/10 27
39%
8/10 10
14%
7/10 14
20%
6/10 0
0%
5/10 0
0%
4/10 0
0%
3/10 1
1%
2/10 0
0%
1/10 0
0%

86.09% Average

The raw data average (mean) for all the Southern Discoveries / Milford Sound Red Boats face-to-face reviews is 86.09% and is based on 69 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.

Weighted Average

87.54%

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
C Clarke 7/10 553 days true 61.86 100%
Alice Ormandy 9/10 575 days true 57.42 93%
Manu Liberta 10/10 620 days true 48.9 79%
Bram Hoonhout 8/10 626 days true 47.83 77%
Sarah 10/10 647 days true 44.16 71%
Robertoi 9/10 665 days true 41.16 66%
Charly 9/10 870 days true 15.63 24%
Liam King 9/10 882 days true 14.63 22%
Clare Holden 10/10 890 days true 13.99 21%
Oliver Schatz 10/10 917 days true 12.02 18%
Nick Young 10/10 922 days true 11.69 18%
Lisa 8/10 936 days true 10.81 16%
Josephine 7/10 952 days true 9.89 15%
Markus Delinsky 8/10 1289 days true 5.68 8%
Hubert 10/10 1361 days true 5.56 8%
Anja Weppler 7/10 1595 days true 5.18 7%
Sandra Frischmann 9/10 1625 days true 5.13 7%
Simon Galpin 9/10 1626 days true 5.13 7%
Kletter 9/10 1985 days true 4.54 6%
Jeanne Moustier 9/10 2034 days true 4.46 6%
Michael Kretzschmar 10/10 2069 days true 4.4 6%
Lydia Holleman 9/10 2074 days true 4.39 6%
John 9/10 2076 days true 4.39 6%
Jon Barratt 9/10 2089 days true 4.37 6%
Kali Lohman 8/10 2099 days true 4.35 6%
Stuart Arrol 9/10 2323 days true 3.98 5%
melemele 9/10 2327 days 3.31 4%
Simon Rawlinson 9/10 2339 days true 3.96 5%
Jill Homewood 10/10 2351 days true 3.94 5%
Signe Kaspersen 7/10 2352 days true 3.93 5%
Robert Steendijk 7/10 2353 days true 3.93 5%
Jaap & Susanne 7/10 2367 days true 3.91 5%
Aridne Giraud 8/10 2370 days true 3.9 5%
Nora 9/10 2371 days true 3.9 5%
Andy Bridgman 7/10 2372 days true 3.9 5%
Nikki Bentley 9/10 2373 days true 3.9 5%
Filsack 8/10 2379 days true 3.89 5%
Herbert 7/10 2400 days true 3.85 5%
Stephane Lebel 10/10 2697 days true 3.37 4%
Florian 9/10 2714 days true 3.34 4%
Antoine Van Hoovled 9/10 2714 days true 3.34 4%
K Dahmer 10/10 2717 days true 3.33 4%
Julia 9/10 2722 days true 3.33 4%
WeddingMaven 10/10 2724 days 2.77 3%
Kasia Robshaw 9/10 2728 days true 3.32 4%
Roger Lows 9/10 2743 days true 3.29 4%
Jochen 7/10 2750 days true 3.28 4%
VisualDelight 10/10 2936 days 2.48 3%
John Cox 9/10 3095 days true 2.71 3%
Susi Schoetzler 10/10 3137 days true 2.64 3%
Simon Bartholomew 10/10 3191 days true 2.55 3%
Raewyn 10/10 3420 days true 2.18 2%
Ger 9/10 3421 days true 2.18 2%
jjakkeren 7/10 3423 days true 2.17 2%
PaulC 9/10 3429 days true 2.16 2%
Dave Ashun 9/10 3430 days true 2.16 2%
ChristinaV 8/10 3432 days true 2.16 2%
JanW 3/10 3435 days true 1.99 2%
KatrinS 8/10 3435 days true 2.15 2%
Christian Moll 7/10 3439 days true 2.15 2%
Peter 8/10 3439 days true 2.15 2%
Charles 8/10 3455 days true 2.12 2%
JennyD1 7/10 3529 days true 2.0 2%
bobmcg 10/10 3536 days 1.66 1%
Stephanie Schikora 10/10 3566 days 1.62 1%
Paul 7/10 3600 days true 1.88 2%
Suyin 10/10 3621 days true 1.85 2%
Tom Ben 10/10 3794 days true 1.56 1%
Anja Kunert 9/10 3820 days true 1.52 1%
Zurcher Marco 10/10 3850 days true 1.47 1%
Sandra Gustafson 7/10 3865 days true 1.45 1%
Julie 9/10 4109 days true 1.05 0%
Chatin Perrier 10/10 4160 days true 0.96 0%
Pete 9/10 4177 days true 0.93 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 Southern Discoveries / Milford Sound Red Boats experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-5.32% Adjustment

There may be an adjustment if an experience hasn't received any reviews within the last 60 days. However the Southern Discoveries / Milford Sound Red Boats 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 Southern Discoveries / Milford Sound Red Boats experience has been adjusted for 266 days. Adjustments are according to the following table.

Days Adjustment
263 -5.26%
264 -5.28%
265 -5.30%
266 -5.32%
267 -5.34%
268 -5.36%
269 -5.38%

Final Ranking Score

82%

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.