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 Christchurch Tramway.

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

Christchurch Tramway

Valid Reviews

42 Valid Reviews

The Christchurch Tramway experience has a total of 42 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 42 valid reviews:

Rating Count Percentage
10/10 11
26%
9/10 11
26%
8/10 10
24%
7/10 1
2%
6/10 4
10%
5/10 2
5%
4/10 1
2%
3/10 0
0%
2/10 2
5%
1/10 0
0%

80.48% Average

The raw data average (mean) for all the Christchurch Tramway valid reviews is 80.48% and is based on 42 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

36 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 42 valid reviews, the experience has 36 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 36 face-to-face reviews:

Rating Count Percentage
10/10 10
28%
9/10 7
19%
8/10 9
25%
7/10 1
3%
6/10 4
11%
5/10 2
6%
4/10 1
3%
3/10 0
0%
2/10 2
6%
1/10 0
0%

78.89% Average

The raw data average (mean) for all the Christchurch Tramway face-to-face reviews is 78.89% and is based on 36 face-to-face reviews. This value is not used to calculate the ranking score and it only provided here for comparison purposes.

Weighted Average

82.35%

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
Ara Moore-Tuwhangai 10/10 1912 days 3.76 100%
Sue Robertson 10/10 2747 days true 2.49 66%
Jim Addicott 10/10 2747 days true 2.49 66%
Derek Puplett 8/10 3104 days true 1.85 49%
Frank Lehe 9/10 3113 days true 1.93 51%
David Heads 2/10 3115 days true 1.44 38%
Chris 6/10 3120 days true 1.59 42%
Rosey834 9/10 3190 days 1.81 48%
jenniferuk 7/10 3404 days true 1.35 36%
Brigitta Reil 9/10 3449 days true 1.42 38%
Marcus Kippner 5/10 3456 days true 1.14 30%
Robertson 8/10 3475 days true 1.31 35%
Coby Aalbrecht 6/10 3492 days true 1.12 30%
W David R Thomas 9/10 3498 days true 1.34 36%
Maarten 9/10 3502 days true 1.34 36%
John J 8/10 3507 days true 1.26 34%
Stevens Frans 2/10 3510 days true 0.99 26%
Greg Kennedy 10/10 3512 days true 1.32 35%
Heino keyssler 10/10 3513 days true 1.32 35%
asselman 8/10 3540 days true 1.21 32%
X Neils 5/10 3577 days true 0.99 26%
DustyLaptop 9/10 3738 days 0.98 26%
RogerW 10/10 3789 days true 0.9 24%
Mark Coffey 9/10 3799 days 0.88 24%
HenizV 8/10 3808 days true 0.83 22%
JohnN 6/10 3816 days true 0.71 19%
Jan 10/10 3829 days true 0.84 22%
Debbie Mossman 9/10 3874 days 0.77 21%
Laura 9/10 4005 days true 0.57 15%
Amy Shields 9/10 4009 days true 0.56 15%
CollyBob 10/10 4071 days true 0.47 13%
Mariah 8/10 4183 days true 0.28 8%
Paul Weston 8/10 4192 days true 0.27 7%
David Buckley 10/10 4199 days true 0.28 7%
Jurgen Westphal 9/10 4199 days true 0.28 7%
Roger & Margaret 8/10 4199 days 0.26 7%
Jim Curley 10/10 4211 days true 0.26 7%
Wayne Best 4/10 4235 days true 0.17 5%
Maruja 6/10 4242 days true 0.17 5%
Edwin 10/10 4280 days true 0.15 4%
Hanna Tidebrant 8/10 4366 days true 0.02 1%
beesom 8/10 4565 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 Christchurch Tramway experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-3.98% Adjustment

There may be an adjustment if an experience hasn't received any reviews within the last 60 days. However the Christchurch Tramway 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 199 days.

The Christchurch Tramway experience has been adjusted for 199 days. Adjustments are according to the following table.

Days Adjustment
196 -3.92%
197 -3.94%
198 -3.96%
199 -3.98%
200 -4.00%
201 -4.02%
202 -4.04%

Final Ranking Score

78%

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.