Concentration in
µg/ml

Mean area Response achieved

Response calculated thru Trend line equation

Residual (Response practical -Response theoretical)

Residual square

34.2

294426

288932.80

-5493.2

98899047.0

51.3

430896

436335.20

5439.2

1133160.3

68.4

580852

583737.60

2885.6

207613517.4

85.5

731256

731140.00

-116.0

200366856.0

102.6

881258

878542.40

-2715.6

308163981.2

Residual sum of squares

75474769.6
                                  Correlation coefficient 0.999

Trend line equation        y = 8620x - 5872
Table 2a: Residual summary of Linearity results of Sumatriptan succinate