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

67.01%

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
Steve Sopota 4/10 790 days 15.6 100%
Fanny Hacquart 5/10 1273 days true 3.77 24%
Jill Stebbing 7/10 1541 days true 3.76 24%
Petru 10/10 1592 days true 4.03 26%
Amadeus van Schie 8/10 1624 days true 3.77 24%
Esther Itier 7/10 1911 days true 3.1 20%
Thomas Neron 7/10 1911 days true 3.1 20%
Clare Lambley 8/10 1992 days true 3.08 20%
Eric Lambley 5/10 1993 days true 2.63 17%
Ngaire Davies 7/10 2324 days true 2.36 15%
Cindy Parson 10/10 2616 days 2.02 13%
Petra Blumberg 8/10 2653 days true 1.85 12%
David and Sally Wallis 8/10 2728 days true 1.71 11%
Steve and Therese Dunne 8/10 2749 days true 1.68 11%
Michael & Janet 9/10 3022 days true 1.23 8%
Michael & Rosemary Smith 8/10 3027 days true 1.16 7%
Mike & April Prince 8/10 3054 days true 1.11 7%
Warwick Ravell 9/10 3120 days true 1.04 7%
Alita Smith 2/10 3350 days true 0.44 3%
Graham Greentree 9/10 3355 days true 0.58 4%
Bill Cutler 9/10 3368 days true 0.55 4%
Steve Pearce 8/10 3382 days true 0.5 3%
Jenny & Barry Sleeman 8/10 3399 days true 0.47 3%
David Glover 10/10 3400 days true 0.49 3%
Grada Anderson 10/10 3406 days true 0.48 3%
Rosey834 8/10 3437 days 0.4 3%
Kerry Wood 10/10 3745 days true 0.0 0%
David Valentine 4/10 3765 days true 0.0 0%
Sandra B 8/10 3770 days true 0.0 0%
Gary Judd 8/10 3770 days true 0.0 0%
carmenk 8/10 3819 days true 0.0 0%
Wolfgang Dittrich 8/10 3843 days true 0.0 0%
Simon Bartholomew 6/10 3845 days true 0.0 0%
Sarah Smith 7/10 3859 days true 0.0 0%
regw 10/10 3953 days true 0.0 0%
nickm 10/10 4032 days true 0.0 0%
Amy_B 8/10 4065 days true 0.0 0%
Roy 9/10 4081 days true 0.0 0%
Richard 8/10 4086 days true 0.0 0%
Elise 8/10 4127 days true 0.0 0%
Jordi 8/10 4197 days true 0.0 0%
purplekat99 10/10 4198 days 0.0 0%
David 9/10 4202 days true 0.0 0%
Fothergill 8/10 4283 days true 0.0 0%
Peddy 7/10 4312 days 0.0 0%
Ulrike 10/10 4344 days true 0.0 0%
Helen 6/10 4427 days true 0.0 0%
Anke 5/10 4427 days true 0.0 0%
Olga 4/10 4443 days true 0.0 0%
Aiko Nishimura 8/10 4464 days true 0.0 0%
Kerstin Brantryd 5/10 4464 days true 0.0 0%
Marian Mckinney 9/10 4470 days true 0.0 0%
Greg & Lynette 9/10 4470 days true 0.0 0%
Sally and David Wallis 8/10 4477 days true 0.0 0%
Lisa Tame 7/10 4478 days true 0.0 0%
Katharina 8/10 4489 days true 0.0 0%
Jim Curley 6/10 4489 days true 0.0 0%
Kilsby 10/10 4505 days true 0.0 0%
Lyn Saxon 8/10 4562 days true 0.0 0%
Phillipa 9/10 4787 days true 0.0 0%
Sue 8/10 4795 days true 0.0 0%
Michael 7/10 4795 days true 0.0 0%
Simon 10/10 4807 days true 0.0 0%
Fred 8/10 4807 days true 0.0 0%
Cat 9/10 4807 days true 0.0 0%
Sandra 8/10 4814 days true 0.0 0%
Pam Rose 8/10 4817 days true 0.0 0%
Kerry 8/10 4852 days true 0.0 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 Tranz Alpine Train experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-2.47% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 105 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 -2.43%
198 -2.45%
199 -2.46%
200 -2.47%
201 -2.48%
202 -2.50%
203 -2.51%

Final Ranking Score

64%

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.