Originally Posted by
schnee
... and still it would mean nothing because of people's self-reporting bias, selection bias, need to please the test administrator, variations due to their health, etc.
You keep thinking that if you control for enough data and variables that the people part will naturally fall into place. That's a fallacy.
Our brains only process an approximation of actual events, our memories are faulty and have predictably unpredictable oddities, and what people say is never what they mean. If you require any information that they filter then it's unreliable. People just aren't rational, at the core. That's why marketing is more about emotional appeal, presentation and manipulation than objective information clarity.
Now, if I misunderstood you and you just want to measure frequencies and pop them into a spreadsheet, sure, go for it. But that still won't tell you anything about people.
It may be a fallacy, it may not. You can record a person's opinion on ride qualities against the vibration frequencies. If you have a large enough sample size you can statistically determine if there is a correlation between the opinions and frequencies or if there is not.
Your hypothesis is that there is not a correlation. The opposite of your hypothesis may be true.