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In stats-speak, you'd say that the gender categorical variable has only two degrees of freedom, because the degrees of freedom are always one less than the possible values the variable can take.
The F statistic-The F statistic is the ratio of explained to unexplained squared error (X3/X1 in the sheet) times the ratio of degrees of freedom to dependent variables.
You can then calculate the Degrees of Freedom in Z3 by subtracting the model coefficient count from the
You'll get a value of 980 degrees of freedom.
As noted above, this is just the ratio of explained to unexplained squared error (X3/X1) times the ratio of degrees of freedom to dependent variables (Z3/(Z2-1)):
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