you can have categorical outcome variables! It's just that they would not be represented in a histogram.
Which of these two variables is the outcome variable?
The outcome variable is also called the response or dependent variable, and the risk factors and con founders are called the predictors, or explanatory or independent variables. In regression analysis, the dependent variable is denoted "Y" and the independent variables are denoted by "X
ABOUT HISTOGRAM :
A histogram is a graphical representation of data points organized into user-specified ranges. Similar in appearance to a bar graph, the histogram condenses a data series into an easily interpreted visual by taking many data points and grouping them into logical ranges or bins.
Learn more about histogram :
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