Doubts in applying Linear Regression

@fornanthu wrote:

Hi,

My data,

 Exercise Econ  Job Position
       50    1    A    Owner
       30    0 <NA>     <NA>
       25    1    B Employee
       44    1    B    Owner
       32    0 <NA>     <NA>
       50    0 <NA>     <NA>
       22    1    A Employee
       14    1    C Director

lm(formula = Exercise ~ Job + Position)

The coefficients comes as
Coefficients:
(Intercept) JobB JobC PositionEmployee PositionOwner
50 3 -36 -28 NA

My Question is,

1. Why “NA” for PositionOwner ? and How do i resolve it ?
2. When i change the value to “C” for exercise “44” then i am not getting NA for postiionOwner ?
3. Generally, how can i dealt these NA in coefficents for factor variables ?

Regards,
Nantha.

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