Would you like to know how the percentages you see on the members page are calculated? Read more about the calculation formula behind the percentages on the WebwinkelKeur member page here:
On the members page percentages are displayed. These are the percentages behind the green thumbs up (positive), orange/yellow exclamation mark (neutral), the red thumbs down (negative). In the example above, the positive percentage is 60%, Neutral 4% and negative 36%. We see 4 and 5 star ratings as positive, 3 stars as neutral and 1 and 2 stars as negative.
Now the calculation of the percentages seems simple. Still, you are faced with rounding problems and we would like the total to come out to 100%. Therefore, we would like to explain exactly how we calculate the percentages. First, we calculate the percentage of positive ratings. Next, we calculate the percentage of negative reviews. We then calculate the neutral percentage by looking at "what percentage is left to arrive at the total of 100%."
An example
All these collected experiences together is the total for the calculation. In this example, we call this PNN. For the above example, at the time of writing: POS = 15 NEU = 1 NEG = 9 PNN = 25
Then the percentages are calculated as follows:
- Positive percentage: round(POS/PNN*100)
- Neutral percentage: 100 - round(POS/PNN*100) - round(NEG/PNN*100)
- Negative percentage: round(NEG/PNN*100)
Calculated for the above example, this is:
- Positive percentage: 15/25*100 = 60%
- Neutral percentage: 1/25*100 = 4%
- Negative percentage: 9/25*100 = 36%
In this example, the 4% corresponds exactly to 1 rating. However, due to rounding, this neutral percentage may be higher than you would expect. For example, if there are 17 positive ratings and 9 negative ones. The new calculation is then as follows:
- Positive percentage: 17/26*100 = 65%
- Neutral percentage: 0/26*100 = 1%
- Negative percentage: 9/26*100 = 34%
As you can see, there are no neutral ratings in this example, but 1% is still displayed. This is due to rounding. In our opinion, in practice this is the fairest way to display the percentages.
Ratings without stars
Reviews without stars do not count for our calculation, reviews without stars actually only occur if a consumer posts a review more than once within a short period of time. We then display the text, but do not count such a review towards the score.