For weeks 14 calculate the prevalence and incidence rates an

For weeks 1–4, calculate the prevalence and incidence rates, and express them as decimals. (i.e., 0.125)

You will have an incidence and a prevalence for each individual week 1-4.

	Newly Diagnosed with Parasite	Number of Population NEGATIVE for Diagnosis with Parasite
0 (week/)s	0 (positive)	1025 (negative)
1	105	920
2	180	740
3	390	350
4	325	25

prevalence= number of cases positive for disease/ population size.

PREVALENCE RATIOS---

prevalence, week 0= 0/1025=0

prevalence, week 1=105/1025=0.102

prevalence, week 2=180/920=0.195

prevalence, week 3=390/740.=0.527

prevalence, week 4=325/350=0.928.

incidence=number of cases positive for disease/ number of negative cases.

INCIDENCE RATIOS----

1)WEEK 0, 0/1025=0,

2)WEEK 1, 105/920=0.114

3)WEEK 2,180/740= 0.243

4)week 3, 390/350=1.114

5)week 4, 325/25=13.