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 Tranz Alpine Train.

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

Tranz Alpine Train

Valid Reviews

68 Valid Reviews

The Tranz Alpine Train experience has a total of 68 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 68 valid reviews:

Rating Count Percentage
10/10 11
16%
9/10 10
15%
8/10 28
41%
7/10 8
12%
6/10 3
4%
5/10 4
6%
4/10 3
4%
3/10 0
0%
2/10 1
1%
1/10 0
0%

78.24% Average

The raw data average (mean) for all the Tranz Alpine Train valid reviews is 78.24% and is based on 68 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

63 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 68 valid reviews, the experience has 63 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 63 face-to-face reviews:

Rating Count Percentage
10/10 9
14%
9/10 10
16%
8/10 27
43%
7/10 7
11%
6/10 3
5%
5/10 4
6%
4/10 2
3%
3/10 0
0%
2/10 1
2%
1/10 0
0%

78.25% Average

The raw data average (mean) for all the Tranz Alpine Train face-to-face reviews is 78.25% and is based on 63 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.

Weighted Average

76.41%

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
Steve Sopota 4/10 1169 days 100%
Fanny Hacquart 5/10 1652 days 81%
Jill Stebbing 7/10 1920 days 79%
Petru 10/10 1971 days 84%
Amadeus van Schie 8/10 2003 days 78%
Esther Itier 7/10 2290 days 60%
Thomas Neron 7/10 2290 days 60%
Clare Lambley 8/10 2371 days 59%
Eric Lambley 5/10 2372 days 49%
Ngaire Davies 7/10 2703 days 39%
Cindy Parson 10/10 2995 days 28%
Petra Blumberg 8/10 3032 days 24%
David and Sally Wallis 8/10 3107 days 20%
Steve and Therese Dunne 8/10 3128 days 19%
Michael & Janet 9/10 3401 days 5%
Michael & Rosemary Smith 8/10 3406 days 4%
Mike & April Prince 8/10 3433 days 3%
Warwick Ravell 9/10 3499 days 0%
Alita Smith 2/10 3729 days 13%
Graham Greentree 9/10 3734 days 20%
Bill Cutler 9/10 3747 days 20%
Steve Pearce 8/10 3761 days 18%
Jenny & Barry Sleeman 8/10 3778 days 18%
David Glover 10/10 3779 days 20%
Grada Anderson 10/10 3785 days 20%
Rosey834 8/10 3816 days 18%
Kerry Wood 10/10 4124 days 20%
David Valentine 4/10 4144 days 14%
Sandra B 8/10 4149 days 18%
Gary Judd 8/10 4149 days 18%
carmenk 8/10 4198 days 18%
Wolfgang Dittrich 8/10 4222 days 18%
Simon Bartholomew 6/10 4224 days 15%
Sarah Smith 7/10 4238 days 17%
regw 10/10 4332 days 20%
nickm 10/10 4411 days 20%
Amy_B 8/10 4444 days 18%
Roy 9/10 4460 days 20%
Richard 8/10 4465 days 18%
Elise 8/10 4506 days 18%
Jordi 8/10 4576 days 18%
purplekat99 10/10 4577 days 20%
David 9/10 4581 days 20%
Fothergill 8/10 4662 days 18%
Peddy 7/10 4691 days 17%
Ulrike 10/10 4723 days 20%
Helen 6/10 4806 days 15%
Anke 5/10 4806 days 15%
Olga 4/10 4822 days 14%
Aiko Nishimura 8/10 4843 days 18%
Kerstin Brantryd 5/10 4843 days 15%
Marian Mckinney 9/10 4849 days 20%
Greg & Lynette 9/10 4849 days 20%
Sally and David Wallis 8/10 4856 days 18%
Lisa Tame 7/10 4857 days 17%
Katharina 8/10 4868 days 18%
Jim Curley 6/10 4868 days 15%
Kilsby 10/10 4884 days 20%
Lyn Saxon 8/10 4941 days 18%
Phillipa 9/10 5166 days 20%
Sue 8/10 5174 days 18%
Michael 7/10 5174 days 17%
Simon 10/10 5186 days 20%
Fred 8/10 5186 days 18%
Cat 9/10 5186 days 20%
Sandra 8/10 5193 days 18%
Pam Rose 8/10 5196 days 18%
Kerry 8/10 5231 days 18%

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 Tranz Alpine Train experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-2.25% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 114 days. However the Tranz Alpine Train 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 200 days. Due to the seasonal nature of many businesses, this adjustment is applied dynamically throughout the year.

The Tranz Alpine Train experience has been adjusted for 200 days. Adjustments are according to the following table.

Days Adjustment
197 -2.21%
198 -2.23%
199 -2.24%
200 -2.25%
201 -2.26%
202 -2.27%
203 -2.28%

Final Ranking Score

74%

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.