Before using the assistant, you have to start *Excel*
and open the worksheet where your data is. Then you navigate
into the **tools** menu, go to the **eirt** sub-menu
and choose the **start the assistant** option.

The *eirt* program is an assistant like program with four step.
At each step, the program gives a brief instruction, you give the
information asked and then click on the **next** button. At the end
of this process a report is generated.

At any step of the assistant, you can click on the **back** button
to go at the previous step, on the **cancel** button to stop the program,
or on the **help** button to get help.

- Step 1 : the data selection
- Step 2 : the data type definition

- Step 3 : the model or method choice
- The one parameter logistic model
- The two parameters logistic model
- The three parameters logistic model
- The nominal response model
- The graded response model
- The kernel estimator
- The penalized maximum marginal likelihood estimator

- Step 4 : the report options
- The classical test theory statistics
- The test of fit
- The test of local independance
- The item parameters
- The ability estimates
- The item and option characteristic curves
- The information functions
- The standard errors
- All the data points from the plots

- The report

2011-09-23