#NATURAL LOG STATA MANUAL#

In many Stata commands, conditions can be specified so that the command will be run only on observations for which the condition holds. We need to first generate a variable named educ_parent that will be equal to the father's education, for boys:

#NATURAL LOG STATA MANUAL#

Actually, if you will type help gen and help replace, you'll get to the same manual page. The only difference between replace and gen is that gen creates a new variable and puts values in it, while replace takes an already existing variable and puts values in it. In order to do this, you will need to use both the gen and the replace command. Now, suppose you want to create a variable like this:Д®duc_parent = father's education if the student is male and mother's education if the student is female.Д®ducation_level = 0 if education equals 0Д®ducation_level = 1 if education is higher than 0 and lower-or-equal than 6Д®ducation_level = 2 if education is higher than 6 and lower-or-equal than 9Д®ducation_level = 3 if education is higher than 9 and lower-or-equal than 12Д®ducation_level = 4 if education is higher than 12 Variables which are determined by a condition This way, the variable will be constant over all observations. You may use an expression that is independent of any variable.

In the first example, for an observation with an income of 200, income_squared will contain 40,000, but for an observation with an income of 100, income_squared will contain 10,000. Stata will generate a new variable, and for each of the observations, it will evaluate the expression specified according to the values in the variables we use in the expression. To create a variable, you should use the gen command. Variables which are simple functions of other variables From the project's point of view, the data handling from now on will take place in parallel with the statistical analysis. Also, it is very common to see log-level and log-log models, in which the natural log of some variables are run instead of the variables themselves. If your Econometric model is quadratic, for instance, or in other words, if you measure the effect x on y with both x and x-squared, you need to create a variable with x-squared. To do so, you will first need to think about the statistical analyses you will want to do later on. OK, so you have all your data gathered from all sources, and now you need to define additional variables, or drop some data that is irrelevant for your sample.

Natural log stata