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In one journal article you found that the 5 year probability for diabetes is 0. In another you find the 4 year probability for diabetes is 0....
In one journal article you found that the 5 year probability for diabetes is 0.8. In another you find the 4 year probability for diabetes is 0.5. Calculate the 1 year probability of getting diabetes.
Would the answer be .8/5 + .5/4 = 0.285?