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

87.82%

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 7/10 474 days true 77.28 100%
Alice Ormandy 9/10 496 days true 73.22 95%
Manu Liberta 10/10 541 days true 64.35 83%
Bram Hoonhout 8/10 547 days true 63.1 81%
Sarah 10/10 568 days true 58.81 76%
Robertoi 9/10 586 days true 55.27 71%
Charly 9/10 791 days true 23.57 30%
Liam King 9/10 803 days true 22.21 28%
Clare Holden 10/10 811 days true 21.34 27%
Oliver Schatz 10/10 838 days true 18.56 23%
Nick Young 10/10 843 days true 18.08 22%
Lisa 8/10 857 days true 16.77 21%
Josephine 7/10 873 days true 15.37 19%
Markus Delinsky 8/10 1210 days true 5.81 6%
Hubert 10/10 1282 days true 5.69 6%
Anja Weppler 7/10 1516 days true 5.31 6%
Sandra Frischmann 9/10 1546 days true 5.26 6%
Simon Galpin 9/10 1547 days true 5.26 6%
Kletter 9/10 1906 days true 4.67 5%
Jeanne Moustier 9/10 1955 days true 4.59 5%
Michael Kretzschmar 10/10 1990 days true 4.53 5%
Lydia Holleman 9/10 1995 days true 4.52 5%
John 9/10 1997 days true 4.52 5%
Jon Barratt 9/10 2010 days true 4.5 5%
Kali Lohman 8/10 2020 days true 4.48 4%
Stuart Arrol 9/10 2243 days true 4.11 4%
melemele 9/10 2248 days 3.42 3%
Simon Rawlinson 9/10 2260 days true 4.08 4%
Jill Homewood 10/10 2272 days true 4.07 4%
Signe Kaspersen 7/10 2273 days true 4.06 4%
Robert Steendijk 7/10 2274 days true 4.06 4%
Jaap & Susanne 7/10 2288 days true 4.04 4%
Aridne Giraud 8/10 2291 days true 4.03 4%
Nora 9/10 2292 days true 4.03 4%
Andy Bridgman 7/10 2293 days true 4.03 4%
Nikki Bentley 9/10 2294 days true 4.03 4%
Filsack 8/10 2300 days true 4.02 4%
Herbert 7/10 2321 days true 3.98 4%
Stephane Lebel 10/10 2618 days true 3.5 3%
Florian 9/10 2635 days true 3.47 3%
Antoine Van Hoovled 9/10 2635 days true 3.47 3%
K Dahmer 10/10 2638 days true 3.46 3%
Julia 9/10 2643 days true 3.46 3%
WeddingMaven 10/10 2645 days 2.88 2%
Kasia Robshaw 9/10 2649 days true 3.45 3%
Roger Lows 9/10 2664 days true 3.42 3%
Jochen 7/10 2671 days true 3.41 3%
VisualDelight 10/10 2856 days 2.59 2%
John Cox 9/10 3016 days true 2.84 2%
Susi Schoetzler 10/10 3058 days true 2.77 2%
Simon Bartholomew 10/10 3112 days true 2.68 2%
Raewyn 10/10 3341 days true 2.31 2%
Ger 9/10 3342 days true 2.31 2%
jjakkeren 7/10 3344 days true 2.3 2%
PaulC 9/10 3350 days true 2.29 2%
Dave Ashun 9/10 3351 days true 2.29 2%
ChristinaV 8/10 3353 days true 2.29 2%
JanW 3/10 3356 days true 2.11 1%
KatrinS 8/10 3356 days true 2.28 2%
Christian Moll 7/10 3360 days true 2.28 2%
Peter 8/10 3360 days true 2.28 2%
Charles 8/10 3376 days true 2.25 2%
JennyD1 7/10 3450 days true 2.13 1%
bobmcg 10/10 3456 days 1.77 1%
Stephanie Schikora 10/10 3486 days 1.72 1%
Paul 7/10 3521 days true 2.01 1%
Suyin 10/10 3541 days true 1.98 1%
Tom Ben 10/10 3715 days true 1.69 1%
Anja Kunert 9/10 3741 days true 1.65 1%
Zurcher Marco 10/10 3771 days true 1.6 1%
Sandra Gustafson 7/10 3786 days true 1.58 1%
Julie 9/10 4029 days true 1.18 0%
Chatin Perrier 10/10 4080 days true 1.09 0%
Pete 9/10 4098 days true 1.06 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

-3.72% 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 186 days. Adjustments are according to the following table.

Days Adjustment
183 -3.66%
184 -3.68%
185 -3.70%
186 -3.72%
187 -3.74%
188 -3.76%
189 -3.78%

Final Ranking Score

84%

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.