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

70.74%

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 4/10 975 days 5.75 100%
Fanny Hacquart 5/10 1458 days true 3.47 60%
Jill Stebbing 7/10 1726 days true 3.43 60%
Petru 10/10 1777 days true 3.67 64%
Amadeus van Schie 8/10 1809 days true 3.42 59%
Esther Itier 7/10 2096 days true 2.77 48%
Thomas Neron 7/10 2096 days true 2.77 48%
Clare Lambley 8/10 2177 days true 2.74 48%
Eric Lambley 5/10 2178 days true 2.33 41%
Ngaire Davies 7/10 2509 days true 2.03 35%
Cindy Parson 10/10 2801 days 1.66 29%
Petra Blumberg 8/10 2838 days true 1.51 26%
David and Sally Wallis 8/10 2913 days true 1.37 24%
Steve and Therese Dunne 8/10 2934 days true 1.33 23%
Michael & Janet 9/10 3207 days true 0.87 15%
Michael & Rosemary Smith 8/10 3212 days true 0.81 14%
Mike & April Prince 8/10 3239 days true 0.76 13%
Warwick Ravell 9/10 3305 days true 0.68 12%
Alita Smith 2/10 3535 days true 0.17 3%
Graham Greentree 9/10 3540 days true 0.22 4%
Bill Cutler 9/10 3553 days true 0.19 3%
Steve Pearce 8/10 3567 days true 0.15 3%
Jenny & Barry Sleeman 8/10 3584 days true 0.12 2%
David Glover 10/10 3585 days true 0.13 2%
Grada Anderson 10/10 3591 days true 0.12 2%
Rosey834 8/10 3622 days 0.05 1%
Kerry Wood 10/10 3930 days true 0.0 0%
David Valentine 4/10 3950 days true 0.0 0%
Sandra B 8/10 3955 days true 0.0 0%
Gary Judd 8/10 3955 days true 0.0 0%
carmenk 8/10 4004 days true 0.0 0%
Wolfgang Dittrich 8/10 4028 days true 0.0 0%
Simon Bartholomew 6/10 4030 days true 0.0 0%
Sarah Smith 7/10 4044 days true 0.0 0%
regw 10/10 4138 days true 0.0 0%
nickm 10/10 4217 days true 0.0 0%
Amy_B 8/10 4250 days true 0.0 0%
Roy 9/10 4266 days true 0.0 0%
Richard 8/10 4271 days true 0.0 0%
Elise 8/10 4312 days true 0.0 0%
Jordi 8/10 4382 days true 0.0 0%
purplekat99 10/10 4383 days 0.0 0%
David 9/10 4387 days true 0.0 0%
Fothergill 8/10 4468 days true 0.0 0%
Peddy 7/10 4497 days 0.0 0%
Ulrike 10/10 4529 days true 0.0 0%
Helen 6/10 4612 days true 0.0 0%
Anke 5/10 4612 days true 0.0 0%
Olga 4/10 4628 days true 0.0 0%
Aiko Nishimura 8/10 4649 days true 0.0 0%
Kerstin Brantryd 5/10 4649 days true 0.0 0%
Marian Mckinney 9/10 4655 days true 0.0 0%
Greg & Lynette 9/10 4655 days true 0.0 0%
Sally and David Wallis 8/10 4662 days true 0.0 0%
Lisa Tame 7/10 4663 days true 0.0 0%
Katharina 8/10 4674 days true 0.0 0%
Jim Curley 6/10 4674 days true 0.0 0%
Kilsby 10/10 4690 days true 0.0 0%
Lyn Saxon 8/10 4747 days true 0.0 0%
Phillipa 9/10 4972 days true 0.0 0%
Sue 8/10 4980 days true 0.0 0%
Michael 7/10 4980 days true 0.0 0%
Simon 10/10 4992 days true 0.0 0%
Fred 8/10 4992 days true 0.0 0%
Cat 9/10 4992 days true 0.0 0%
Sandra 8/10 4999 days true 0.0 0%
Pam Rose 8/10 5002 days true 0.0 0%
Kerry 8/10 5037 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

-4.07% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 43 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 -4.01%
198 -4.03%
199 -4.05%
200 -4.07%
201 -4.09%
202 -4.11%
203 -4.13%

Final Ranking Score

67%

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.