Show percentile rank

Question

The survey would give feedback on personality traits, and in which percentile each participant ranks for each respective trait. Calculating the percentile of someone's results requires that we reference a pre-existing database of many prior survey results. Does your platform provide a way to do this? We would need the survey to somehow access data other than that which was created in the survey.

Answer 1

The way we generally handle this is by pre-computing the means and standard deviations for each subscale (offline, on prior data). Then, if as long as the distribution is reasonably close to a normal distribution, percentiles can be calculated using z-scores.

Here's a program that does that:

--Percentile Calculator from zscore

--takes zscore where zscore=(value - mean)/standard_deviation as input, produces percentile as output (percentile ranges from 0 to 100)

Here is an example of how to use it: https://www.guidedtrack.com/programs/13585

>> userScore = 4

>> knownMean = 3.61
>> knownStandardDeviation = 2.1

>> zscore = (userScore - knownMean)/knownStandardDeviation
*program: Percentile Calculator from zscore

>> userPercentile = percentile
Your percentile score is {userPercentile}!