Skip to main content
Version: Next

Fit Issues

This page covers expression, fitting, inversion, and optimization failures in Fit module.

Symptom: Expression validation fails​

Checks:

  1. Verify all variables are bound.
  2. Verify coefficient names do not collide with variable names.
  3. Verify expression contains only supported identifiers.

Symptom: Fit not converged​

Checks:

  1. Adjust initial coefficient values.
  2. Narrow or re-center coefficient bounds.
  3. Improve sample coverage and remove obvious outliers.
  4. Check for singular model form in current data range.

Symptom: Optimization target validation fails​

Checks:

  1. Ensure every target expression is valid.
  2. Ensure every target weight is greater than zero.
  3. Ensure target values are numerically reachable.

Symptom: Solved variables look unreasonable​

Checks:

  1. Verify variable bounds and units.
  2. Verify default values are not too far from feasible region.
  3. Validate results on independent verification rows.
  1. Fit Quick Start
  2. Fit Result Validation