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The NLMIXED Procedure |

**ESTIMATE***'label' expression <options>***;**

The ESTIMATE statement enables you to compute an additional estimate that is a function of the parameter values. You must provide a quoted string to identify the estimate and then a valid SAS expression. Multiple ESTIMATE statements are permitted, and results from all statements are listed in a common table. PROC NLMIXED computes approximate standard errors for the estimates using the delta method (Billingsley 1986). It uses these standard errors to compute corresponding

The ECOV option in the PROC NLMIXED statement produces a table containing the approximate covariance matix of all of the additional estimates you specify. The ECORR option produces the corresponding correlation matrix. The EDER option produces a table of the derivatives of the additional estimates with respect to each of the model parameters.

The following options are available in the ESTIMATE statement:

**ALPHA=**-
specifies the alpha level to be used in computing confidence
limits. The default value corresponds to the ALPHA= option in
the PROC NLMIXED statement.
**DF=***d*-
specifies the degrees of freedom to be used in computing
*p*-values and confidence limits. The default value corresponds to the DF= option in the PROC NLMIXED statement.

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