Define the parameters and expression of a Curve Fit Definition from the Signals Configuration

For Administrators only.

Prior to this task:

✔ A Curve Fit Definition must be created.

*Required.

Supporting Knowledge

Note: At least one parameter must be configured before the Definition can be enabled. Providing appropriate starting values and constraints is essential for custom models for the fitting algorithm to converge reliably. If a custom model does not fit successfully, review the start values and parameter boundaries first.

† Fields options for each parameter

Field	Description
Name (required)	Alphanumeric only; must start with a letter.
Label	Description of the parameter (max 50 characters).
Start Type	Initial numeric value for fitting; default is Value; other options: Min X, Min Y, Max X, Max Y, Mid X, Mid Y.
Fix	When checked, parameter value is held constant during fitting and not optimized.
Lower Limit	Minimum allowable value for the parameter during fitting.
Upper Limit	Maximum allowable value for the parameter during fitting.

‡ Supported syntax for the expression

Syntax Type	Supported Options
Arithmetic operators	+, -, *, /, ^ (power)
Grouping	( )
Built-in functions	abs, acos, asin, atan, ceil, cos, exp, floor, log, log10, log1p, log2, pow, round, sin, sqrt, tan, clamp
Parameter references	Use parameter names exactly as defined (e.g., A * X + B)

Other available options

To lock a parameter, under Parameters, select the [Lock parameter] icon to fix its current values. Locked parameters are read-only in all views—definition, template configuration, and In Vitro Analysis execution—and are indicated by a lock icon.
To remove a parameter, under Parameters, select the [Delete parameter] icon. From the Confirm Delete window, select [Delete].
To upload a visual preview of the curve shape, from the Curve Fit Definition details view, select [Actions], then select Upload Preview, and select a PNG, JPG, JPEG, or SVG file. The definition must be in Draft status to upload, replace, or delete a preview image.

1️⃣ Signals Configuration ➡ select [Analytics]
2️⃣ Analytics ➡ select Analytics Definition
3️⃣ Curve Fit Definition ➡ Parameters ➡ select [Add Parameter]
4️⃣ Curve Fit Definition ➡ Parameters ➡ enter field information † Name* Label Start Type Fix Lower Limit Upper Limit
5️⃣ Curve Fit Definition ➡ Expression editor ➡ type mathematical expression ‡
6️⃣ Curve Fit Definition ➡ select [Save]

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