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.

Nick Morrison's avatar

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

88.16%

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
C Clarke 7/10 375 days 100%
Alice Ormandy 9/10 397 days 96%
Manu Liberta 10/10 442 days 89%
Bram Hoonhout 8/10 448 days 88%
Sarah 10/10 469 days 84%
Robertoi 9/10 487 days 80%
Charly 9/10 692 days 39%
Liam King 9/10 704 days 37%
Clare Holden 10/10 712 days 35%
Oliver Schatz 10/10 739 days 31%
Nick Young 10/10 744 days 31%
Lisa 8/10 758 days 29%
Josephine 7/10 774 days 26%
Markus Delinsky 8/10 1111 days 5%
Hubert 10/10 1183 days 5%
Anja Weppler 7/10 1417 days 5%
Sandra Frischmann 9/10 1447 days 5%
Simon Galpin 9/10 1448 days 5%
Kletter 9/10 1807 days 4%
Jeanne Moustier 9/10 1856 days 4%
Michael Kretzschmar 10/10 1891 days 4%
Lydia Holleman 9/10 1896 days 4%
John 9/10 1898 days 4%
Jon Barratt 9/10 1911 days 4%
Kali Lohman 8/10 1921 days 4%
Stuart Arrol 9/10 2145 days 3%
melemele 9/10 2149 days 3%
Simon Rawlinson 9/10 2161 days 3%
Jill Homewood 10/10 2173 days 3%
Signe Kaspersen 7/10 2174 days 3%
Robert Steendijk 7/10 2175 days 3%
Jaap & Susanne 7/10 2189 days 3%
Aridne Giraud 8/10 2192 days 3%
Nora 9/10 2193 days 3%
Andy Bridgman 7/10 2194 days 3%
Nikki Bentley 9/10 2195 days 3%
Filsack 8/10 2201 days 3%
Herbert 7/10 2222 days 3%
Stephane Lebel 10/10 2519 days 3%
Florian 9/10 2536 days 3%
Antoine Van Hoovled 9/10 2536 days 3%
K Dahmer 10/10 2539 days 3%
Julia 9/10 2544 days 3%
WeddingMaven 10/10 2546 days 2%
Kasia Robshaw 9/10 2550 days 3%
Roger Lows 9/10 2565 days 3%
Jochen 7/10 2572 days 3%
VisualDelight 10/10 2758 days 2%
John Cox 9/10 2917 days 2%
Susi Schoetzler 10/10 2959 days 2%
Simon Bartholomew 10/10 3013 days 2%
Raewyn 10/10 3242 days 1%
Ger 9/10 3243 days 1%
jjakkeren 7/10 3245 days 1%
PaulC 9/10 3251 days 1%
Dave Ashun 9/10 3252 days 1%
ChristinaV 8/10 3254 days 1%
JanW 3/10 3257 days 1%
KatrinS 8/10 3257 days 1%
Christian Moll 7/10 3261 days 1%
Peter 8/10 3261 days 1%
Charles 8/10 3277 days 1%
JennyD1 7/10 3351 days 1%
bobmcg 10/10 3358 days 1%
Stephanie Schikora 10/10 3388 days 1%
Paul 7/10 3422 days 1%
Suyin 10/10 3442 days 1%
Tom Ben 10/10 3616 days 1%
Anja Kunert 9/10 3642 days 1%
Zurcher Marco 10/10 3672 days 1%
Sandra Gustafson 7/10 3687 days 1%
Julie 9/10 3931 days 0%
Chatin Perrier 10/10 3982 days 0%
Pete 9/10 3999 days 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

-1.74% 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 87 days. Adjustments are according to the following table.

Days Adjustment
84 -1.68%
85 -1.70%
86 -1.72%
87 -1.74%
88 -1.76%
89 -1.78%
90 -1.80%

Final Ranking Score

86%

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.