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How many observations dummy variables?
There is a very rough rule of thumb that ten observations per group is the minimum needed to adequately power an ANOVA, but the truth is that it depends on the standard errors of the means for each group and the size of the effect in the populations.
What values can dummy variables take?
Technically, dummy variables are dichotomous, quantitative variables. Their range of values is small; they can take on only two quantitative values. As a practical matter, regression results are easiest to interpret when dummy variables are limited to two specific values, 1 or 0.
How to include dummy variables for year y?
These variables will be named year1996 and year1999 and will help you compare the mean value of Y between the years 1996 and 1995, and between the years 1999 and 1995 (all else being equal).
How can I create time dummy variables for timeseries data?
(NOTE: I am assuming your date variable is in stata’s date format). The same idea can by applied to the other period as well. There may be a more efficient way to do this, but here is one solution. (NOTE: I am assuming your date variable is in stata’s date format).
Do you need to create dummy variables in Stata?
Dummy variables are also called indicator variables. As we will see shortly, in most cases, if you use factor-variable notation, you do not need to create dummy variables. In cases where factor variables are not the answer, you may use generate to create one dummy variable at a time and tabulate to create a set of dummies at once.
How do you create dummy variables in Excel?
Using tabulate to create dummy variables. tabulate with the generate() option will generate whole sets of dummy variables. Say that variable group takes on the values 1, 2, and 3. you will see a frequency table of how many times group takes on each of those values.