Nonproportional
Nonproportional is an adjective used to describe a relationship in which one quantity is not a constant multiple of another. In mathematics, a proportional relationship has the form y = kx, where k is a constant. When a pair of variables is nonproportional, no single constant k relates them across all values: the ratio y/x varies with x or the relationship is nonlinear.
Common nonproportional relationships include quadratic, cubic, exponential, or logarithmic forms, such as y = ax^2, y = e^x,
Nonproportionality is also a standard concern in measurement and instrumentation. Sensor response that deviates from linearity
In other domains such as biology, nonproportional scaling (allometry) describes how traits do not increase in
Because nonproportionality implies nonlinearity, it often necessitates more complex models, piecewise fits, or numerical methods to