Question: The following table represents data for emergency department visits. NOTE:. indicates missing value Year Q1 Q2 Q3 Q4 2014 . . 1,613 1,262 2015 1,311

The following table represents data for emergency department visits. NOTE:. indicates missing value

Year Q1 Q2 Q3 Q4
2014 . . 1,613 1,262
2015 1,311 1,235 944 879
2016 1,385 996 1,516 975
2017 1,276 1,063 1,318 1,087
2018 1,242 1,102 1,536 831
2019 1,122 1,059 . .

If the data were entered into MS Excel as shown below using dummy variables to identify the quarter in which the visits occurred:

Year Visits Q1 Q2 Q3
2014 1,613 0 0 1
2014 1,262 0 0 0
2015 1,311 1 0 0
2015 1,235 0 1 0
2015 944 0 0 1
2015 879 0 0 0
2016 1,385 1 0 0
2016 996 0 1 0
2016 1,516 0 0 1
2016 975 0 0 0
2017 1,276 1 0 0
2017 1,063 0 1 0
2017 1,318 0 0 1
2017 1,087 0 0 0
2018 1,242 1 0 0
2018 1,102 0 1 0
2018 1,536 0 0 1
2018 831 0 0 0
2019 1,122 1 0 0
2019 1,059 0 1 0

Which quarter represents the base, or reference category?

a.Q2

b.Q4

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