These estimates can be obtained using the linear-least-squares technique just discussed. In order to cany out the search efficiently, in some cases one has to enter initial estimates of the parameter values close to the actual values. The POLYMATH software will be used to illustrate this technique. Many software programs are available to find these parameter values and all one has to do is to enter the data. In nonlinear least squares analysis we search for those parameter values that minimize the sum of squares of the differences between the measured values and the calculated values for all the data points. Living Example Problems POLYMATH software that allows students to explore ttie. (5.572) and (5.575)) can be solved only by numerical methods, e.g. The total pressure drop is evaluated by the general model (case 1), i.e.
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