What does XI mean in Stata?

Description. xi expands terms containing categorical variables into indicator (also called dummy) variable sets. by creating new variables and, in the second syntax (xi: any stata command), executes the specified. command with the expanded terms.

What is IX in Stata?

By contrast, i.x notation tells any Stata regression command (and many non-regression commands as well) that the variable x is to be regarded as a discrete categorical variable and that each category (except one reference category) is to be represented in the model by a virtual indicator variable.

What does i variable do in Stata?

Stata: Data Analysis and Statistical Software You can prefix a variable with i. to specify indicators for each level (category) of the variable. You can put a # between two variables to create an interaction–indicators for each combination of the categories of the variables.

What does C do in Stata?

“c.” of course is for “continuous”. will create a series of dummy variables from variable “occupation”. will create a series of dummy variables from variable “occupation” with the second category (whatever it is) as base category.

What is Dprobit?

The dprobit command shows you the marginal effects which you new to assess sustative interpretations of the results. You can estimate the model and after this compute the marginal effects but for example, if you use stata you can use dprobiy directly.

Why does Stata omit dummy variables?

Since firms usually belong to one industry the dummy variable for industry does not vary with time. Hence it is excluded from your model by Stata, since after subtracting the group mean from such variable you will get that it is equal to zero.

What does != Mean in Stata?

13.2.3 Relational operators The relational operators are > (greater than), < (less than), >= (greater than or equal), <= (less than or equal), == (equal), and != (not equal).

What are factor variables?

Factor variables are categorical variables that can be either numeric or string variables. Factor variables are also very useful in many different types of graphics. Furthermore, storing string variables as factor variables is a more efficient use of memory. To create a factor variable we use the factor function.

What is a Dprobit in Stata?