dccvModel {RcmdrPlugin.DCCV}

Fit Model to DCCV Data

Description

Fit a model to DCCV data.

Details

This dialog box implements a parametric analysis of DCCV data using function sbchoice (single-bounded DCCV), oohbchoice (one-and-one-half-bounded DCCV), or dbchoice (double-bounded DCCV) in package DCchoice. This dialog box is activated if a data frame is selected as the active data set. For details on the results of this dialog box, refer to the help content for functions sbchoice, oohbchoice, and dbchoice.

GUI elements of this dialog box are as follows.

• Name for model: An R object name into which the results of a fitted model obtained through this dialog box are stored. The default name ‘DCCVmodel.x’, where x indicates the integer number assigned automatically from 1, can be changed following R's rules for naming objects.

• Choice format: A choice format type for DCCV to be analyzed. Select one of the three radio buttons corresponding to ‘Single-bounded (SB)’, ‘One-and-one-half-bounded (OOHB)’, and ‘Double-bounded (DB)’.

• 1st response variable: A response variable for the suggested price in the first stage of an SB-, OOHB-, or DB-DCCV question. Select it from a drop-down list of variables.

• 2nd response variable: A response variable for the suggested price in the second stage of an OOHB- or DB-DCCV question. Select it from a drop-down list of variables.

• Covariates (optional): Variables to be used as covariates in the model to be fitted. Select none or more variables from a list box of variables.

• 1st bid variable: A bid variable containing the suggested price in the first stage of an SB-, OOHB-, or DB-DCCV question. Select it from a drop-down list of variables.

• 2nd bid variable: A bid variable containing the suggested price in the second stage of an OOHB- or DB-DCCV question. Select it from a drop-down list of variables.

• Take the log of bid: A check box for taking the logarithm of the bid variables. When checked, take the logarithm of the bid variable(s) selected by the ‘1st bid variable’ and ‘2nd bid variable’ drop-down lists.

• Distribution: An error distribution of the model. Select one from radio buttons corresponding to ‘Logistic’, ‘Normal’, ‘Log-logistic’, ‘Log-normal’, and ‘Weibull’.

• Subset expression: A logical expression for specifying a subset of the observations in the active data set to be used for the fitting. If necessary, type a valid logical expression into this box.

• Initial parameters (optional): Initial parameters of independent variables (covariates and bid variables selected above) used in the optimization process of fitting a model. If necessary, type comma-separated values (e.g., 0.3, 1.5, -0.9, ...) into this box.