00:01
Describe an example of a research question where dummy variables should be used.
00:05
So an example would be our placebos effective.
00:13
So in our actual research question, it would most likely be more specific.
00:19
But if we are researching placebo, then we can use a dummy variable.
00:24
A dummy variable can be used to distinguish different treatment groups.
00:54
So if we are testing a placebo, then we would use.
00:58
Zero and one as dummy variables.
01:04
So a person would be given a value of zero if they are in the control group and given a placebo.
01:22
And a person in the experimental group who has given the actual drug will be given the value of one.
01:36
So the dummy variable represents subgroups of the sample in our study.
01:43
Describe the characteristics of the categorical variable and its usage in explaining the variance in the dependent variable.
01:51
So the categorical variable is the qualitative variable.
02:13
You can take on one of a limited and usually fixed number of possible values.
02:24
It assigns each unit of observation to a particular group or nominal category based on some qualitative property.
02:36
An example would be a person's gender because we know that gender is a qualitative variable and not quantitative...
