Table 4 NVDRS Summary Data and Calculations for a Rate Ratio Confidence Interval.

Incident Count

Homicides in Incident

Age <21

Age 21+

ΣC_S1·k

ΣC_S1·k ²

ΣC_S2·k

ΣC_S2·k ²

ΣC_S1·k × C_S2·k

14

1

1

0

14

14

113

1

0

1

113

113

4

2

2

0

8

16

5

2

1

1

5

5

5

5

5

6

2

0

2

12

24

1

3

2

1

2

4

1

1

2

1

4

2

2

2

4

2

4

4

144

31

43

133

147

11