What is sub variable?

What is sub variable?

A sub-variable is a variable (question or loop) which is indented to another parent variable. Furthermore, a sub-variable is subordinate to its parent variable, meaning that if, for example, a do not ask routing targets a parent variable, its sub-variable will also not be asked.

What are different types of variables?

Types of variables

• Independent variables. An independent variable is a singular characteristic that the other variables in your experiment cannot change.
• Dependent variables.
• Intervening variables.
• Moderating variables.
• Control variables.
• Extraneous variables.
• Quantitative variables.
• Qualitative variables.

Can you combine variables in Stata?

Merging is another way of combining datasets. Where the append command adds rows, or observations, merge adds columns, or variables. Thus, you would use merge when there are the same observations across datasets, with different variables, and you want to combine those datasets into one larger dataset.

How do you add sub variables to a variable?

Sub-Variables. Given a location and type within a variable and a name, it creates an sub-variable, installs it in the proper symbol table if the parent variable was in a symbol table, and adds it as a sub-variable, all at once.

How do you find the standard deviation of a combined distribution?

We can find the standard deviation of the combined distributions by taking the square root of the combined variances. To combine the variances of two random variables, we need to know, or be willing to assume, that the two variables are independent. For which pairs of variables would it be reasonable to assume independence?

What happens when you subtract two random variables?

Even when we subtract two random variables, we still add their variances; subtracting two variables increases the overall variability in the outcomes. We can find the standard deviation of the combined distributions by taking the square root of the combined variances.

How are sub variables independent of their parent variables?

Sub-variable names are independent of their parent variable symbols. Whether or not they have the userdefflag set is also independent of the parent.