Two physicians were asked to classify 100 chest Xrays as abn

Two physicians were asked to classify 100 chest X-rays as abnormal or normal independently. The comparison of their classification is shown in the following table:

Classification of Chest X-Rays by Physician 1 compared with Physician 2

Physician 2

Physician 1

Abnormal

Normal

Total

Abnormal

Normal

Total

40

10

50

20

30

50

60

40

100

                                                                50%                                                        50%

The simple overall percent agreement between the two physicians out of the total is:

Solution