Assume the following variables:
BreathingTestResult - continuous variable indicating how well a
person is breathing
Gender - binary variable with gender
BMI - continuous body mass index
FluStatus - whether a person had the flu (positive by test)
LastTestDate - days since last text exam, only valid if the
patient had a positive flu test and indicates
the period from when the person had the flu
Can you do the following: lm(BreathingTestResult ~ Gender + BMI + FluStatus + FluStatus:LastTestDate, data = data)
If I understand correctly, the FluStatus:LastTestDate term should only be calculated for when FluStatus is true and shouldn't be used in the case of FluStatus = False, however somehow there are estimates calculated for both false and true. Is there a way to do this correctly?
Would appreciate any guidance on this!
