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

69.55%

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 4/10 902 days 8.61 100%
Fanny Hacquart 5/10 1385 days true 3.59 42%
Jill Stebbing 7/10 1653 days true 3.56 41%
Petru 10/10 1704 days true 3.81 44%
Amadeus van Schie 8/10 1736 days true 3.56 41%
Esther Itier 7/10 2023 days true 2.9 34%
Thomas Neron 7/10 2023 days true 2.9 34%
Clare Lambley 8/10 2104 days true 2.87 33%
Eric Lambley 5/10 2105 days true 2.45 28%
Ngaire Davies 7/10 2436 days true 2.16 25%
Cindy Parson 10/10 2728 days 1.8 21%
Petra Blumberg 8/10 2765 days true 1.65 19%
David and Sally Wallis 8/10 2840 days true 1.51 17%
Steve and Therese Dunne 8/10 2861 days true 1.47 17%
Michael & Janet 9/10 3134 days true 1.01 12%
Michael & Rosemary Smith 8/10 3139 days true 0.95 11%
Mike & April Prince 8/10 3166 days true 0.9 10%
Warwick Ravell 9/10 3232 days true 0.82 9%
Alita Smith 2/10 3462 days true 0.28 3%
Graham Greentree 9/10 3467 days true 0.36 4%
Bill Cutler 9/10 3480 days true 0.33 4%
Steve Pearce 8/10 3494 days true 0.29 3%
Jenny & Barry Sleeman 8/10 3511 days true 0.26 3%
David Glover 10/10 3512 days true 0.27 3%
Grada Anderson 10/10 3518 days true 0.26 3%
Rosey834 8/10 3549 days 0.19 2%
Kerry Wood 10/10 3857 days true 0.0 0%
David Valentine 4/10 3877 days true 0.0 0%
Sandra B 8/10 3882 days true 0.0 0%
Gary Judd 8/10 3882 days true 0.0 0%
carmenk 8/10 3931 days true 0.0 0%
Wolfgang Dittrich 8/10 3955 days true 0.0 0%
Simon Bartholomew 6/10 3957 days true 0.0 0%
Sarah Smith 7/10 3971 days true 0.0 0%
regw 10/10 4065 days true 0.0 0%
nickm 10/10 4144 days true 0.0 0%
Amy_B 8/10 4177 days true 0.0 0%
Roy 9/10 4194 days true 0.0 0%
Richard 8/10 4199 days true 0.0 0%
Elise 8/10 4240 days true 0.0 0%
Jordi 8/10 4310 days true 0.0 0%
purplekat99 10/10 4310 days 0.0 0%
David 9/10 4315 days true 0.0 0%
Fothergill 8/10 4396 days true 0.0 0%
Peddy 7/10 4424 days 0.0 0%
Ulrike 10/10 4457 days true 0.0 0%
Helen 6/10 4539 days true 0.0 0%
Anke 5/10 4539 days true 0.0 0%
Olga 4/10 4555 days true 0.0 0%
Aiko Nishimura 8/10 4576 days true 0.0 0%
Kerstin Brantryd 5/10 4576 days true 0.0 0%
Marian Mckinney 9/10 4582 days true 0.0 0%
Greg & Lynette 9/10 4582 days true 0.0 0%
Sally and David Wallis 8/10 4589 days true 0.0 0%
Lisa Tame 7/10 4590 days true 0.0 0%
Katharina 8/10 4601 days true 0.0 0%
Jim Curley 6/10 4601 days true 0.0 0%
Kilsby 10/10 4617 days true 0.0 0%
Lyn Saxon 8/10 4674 days true 0.0 0%
Phillipa 9/10 4899 days true 0.0 0%
Sue 8/10 4907 days true 0.0 0%
Michael 7/10 4907 days true 0.0 0%
Simon 10/10 4919 days true 0.0 0%
Fred 8/10 4919 days true 0.0 0%
Cat 9/10 4919 days true 0.0 0%
Sandra 8/10 4926 days true 0.0 0%
Pam Rose 8/10 4929 days true 0.0 0%
Kerry 8/10 4964 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

-3.03% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 75 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 -2.98%
198 -3.00%
199 -3.01%
200 -3.03%
201 -3.04%
202 -3.06%
203 -3.07%

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.