*If <math>r=1</math> and <math>c>1</math>, then <math>df = c-1</math> or if <math>r>1</math> and <math>c=1</math>, then <math>df = r-1</math>. | *If <math>r=1</math> and <math>c>1</math>, then <math>df = c-1</math> or if <math>r>1</math> and <math>c=1</math>, then <math>df = r-1</math>. |