Hi, I have just started teaching a basic econometric class. I found an error in gretl GUI: when you have a qualitative variable, you obtain the dummies for this variable and try to define a new variable, for example multiplying one of the dummies by another variable (quantitative or dummy from other qualitative). You will go now to the menu "Add->Define new variable", you write a new name and a '=' but now if you click on the name of the dummy for building the operation, the name written into the dialog is the name of the original (qualitative), not the name of the dummy. For doing this correctly you have to write the name of the dummy by hand. The suggestion is about the scatterplot. Normally, when I start a new class on Econometrics, I like to show the scatterplot of two variables for illustrating the linear relationship. But it is a litte bit uncomfortable that the gretl scatterplot by default shows the OLS estimated line. I suggest to put this line as an option, may be in the same dialog in which you have to select the variable for X axis. Ignacio