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 Grumpy’s Geraldine Kiwi Holiday Park.

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.

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Nick Morrison

Rankers owner

Grumpy’s Geraldine Kiwi Holiday Park

Valid Reviews

30 Valid Reviews

The Grumpy’s Geraldine Kiwi Holiday Park experience has a total of 32 reviews. There are 30 valid reviews that are included when calculating the ranking score and 2 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.

Within these 30 valid reviews, the experience has 3 face-to-face reviews collected during interviews by our team.

Below is the distribution of ratings for the 30 valid reviews:

Rating Count Percentage
10/10 16
9/10 4
8/10 4
7/10 3
6/10 1
5/10 0
4/10 1
3/10 0
2/10 0
1/10 1

86.67% Average

The raw data average (mean) for all the Grumpy’s Geraldine Kiwi Holiday Park valid reviews is 86.67% and is based on 30 valid reviews. This value is not used to calculate the ranking score and it only provided here as a comparison to the weighted average.

Weighted Average


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
Glenn Davidson 1/10 15 days 83%
Ying 7/10 137 days 100%
Sandra Forstner 10/10 350 days 91%
Sandra Forstner 10/10 350 days 91%
Lauren 10/10 350 days 91%
Sharon 10/10 656 days 40%
Vicki Hoskinson 10/10 687 days 36%
Nadja Kampfhenkel 6/10 746 days 23%
Rhiannon 10/10 930 days 11%
wanchai anantikulchai 10/10 991 days 8%
Saleena Ham 8/10 1021 days 6%
Celine Galmant 10/10 1085 days 6%
Frank Bos 8/10 1107 days 5%
Monique Keeper 10/10 1228 days 5%
Michael Menrath 4/10 1778 days 3%
Tony Maroulis 10/10 1792 days 4%
Sammy Cronin 10/10 1829 days 4%
Yung Ok Yoo 8/10 1844 days 4%
Avery Wong 10/10 1862 days 4%
Oscar Brun Urzaiz 10/10 1882 days 4%
Alison Cary 9/10 1934 days 4%
Luis . 7/10 1964 days 3%
Thomas Blom 7/10 2176 days 3%
Manuela Opprecht 10/10 2187 days 3%
Claudia 10/10 2329 days 3%
Anouck Roudet 9/10 2534 days 1%
Claire Storey 10/10 2633 days 2%
Steve 9/10 2878 days 2%
Laura vanGool 9/10 3228 days 1%
Remke 8/10 3638 days 0%


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 Grumpy’s Geraldine Kiwi Holiday Park experience has plenty of reviews and does not meet the criteria for any adjustment.

Recent Reviews Adjustment

-0.08% Adjustment

There may be an adjustment if this experience hasn't received any reviews within the last 46 days. However the Grumpy’s Geraldine Kiwi Holiday Park 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 Grumpy’s Geraldine Kiwi Holiday Park experience has been adjusted for 4 days. Adjustments are according to the following table.

Days Adjustment
1 -0.02%
2 -0.04%
3 -0.06%
4 -0.08%
5 -0.10%
6 -0.12%
7 -0.14%

Final Ranking Score


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.