Function response_rate_percent 

pub fn response_rate_percent(
    responses_received: f64,
    invitations_sent: f64,
) -> Option<f64>

Survey response rate as a percentage: responses received / invitations sent x 100.

Treat this as a diagnostic signal in its own right (chapter 3.7): a declining rate often indicates eroding trust in the survey process.

Arguments

• responses_received — count of survey responses received.
• invitations_sent — count of survey invitations sent.

Returns

Some(percentage), or None when invitations_sent is zero (rate undefined).

Examples

use software_engineering::developer_experience_metrics::response_rate_percent;

assert_eq!(response_rate_percent(72.0, 100.0), Some(72.0));
assert_eq!(response_rate_percent(1.0, 0.0), None);