4. Process Modeling
4.6. Case Studies in Process Modeling
4.6.1. Load Cell Calibration

4.6.1.2.

Selection of Initial Model

Start Simple

The first step in analyzing the data is to select a candidate model. In the case of a measurement system like this one, a fairly simple function should describe the relationship between the load and the response of the load cell. One of the hallmarks of an effective measurement system is a straightforward link between the instrumental response and the property being quantified.

Plot the Data

Plotting the data indicates that the hypothesized, simple relationship between load and deflection is reasonable. The plot below shows the data. It indicates that a straight-line model is likely to fit the data. It does not indicate any other problems, such as presence of outliers or nonconstant standard deviation of the response.

Initial Model: Straight Line