Assertion: variable's effect | /r/HasProperty | captured for example
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Source sentences:
text: For example, seasonal effects may be captured by creating dummy variables for each of the seasons: D 1 = 1 {\displaystyle D_{1}=1} if the observation is for summer, and equals zero otherwise; D 2 = 1 {\displaystyle D_{2}=1} if and only if autumn, otherwise equals zero; D 3 = 1 {\displaystyle D_{3}=1} if and only if winter, otherwise equals zero; and D 4 = 1 {\displaystyle D_{4}=1} if and only if spring, otherwise equals zero.