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Table 1 Confusion matrix for Tier 2 evaluation of the System-4 malaria forecast seasonal time series

From: Towards seasonal forecasting of malaria in India

a.) JAS

Event forecast in System-4

 

Event in ERAI (1981–2010)

>UT

Yes

No

 

>M

Yes

No

 

<LT

Yes

No

 

Yes

10

0

 

Yes

14

1

 

Yes

8

2

 

No

5

15

 

No

9

6

 

No

9

11

Event in IMD (1981–2002)

>UT

Yes

No

 

>M

Yes

No

 

<LT

Yes

No

 

Yes

6

1

 

Yes

11

0

 

Yes

5

2

 

No

4

11

 

No

5

6

 

No

8

7

Event in TRMM-ERAI (1998–2010)

>UT

Yes

No

 

>M

Yes

No

 

<LT

Yes

No

 

Yes

3

1

 

Yes

5

1

 

Yes

3

1

 

No

4

5

 

No

4

3

 

No

5

4

b.) SON

Event forecast in System-4

 

Event in ERAI (1981–2010)

>UT

Yes

No

 

>M

Yes

No

 

<LT

Yes

No

 

Yes

8

2

 

Yes

14

1

 

Yes

8

2

 

No

5

15

 

No

7

8

 

No

5

15

Event in IMD (1981–2002)

>UT

Yes

No

 

>M

Yes

No

 

<LT

Yes

No

 

Yes

6

1

 

Yes

10

1

 

Yes

5

2

 

No

5

10

 

No

5

6

 

No

3

12

Event in TRMM-ERAI (1998–2010)

>UT

Yes

No

 

>M

Yes

No

 

<LT

Yes

No

 

Yes

3

1

 

Yes

6

0

 

Yes

3

1

 

No

1

8

 

No

3

4

 

No

3

6

  1. The confusion matrix, or contingency table, collates hit, miss, false alarm and correct rejection rates in Figures 10 and 11 for the System-4 seasonal time series against the three meteorological observation/reanalysis datasets used to drive LMM for a.) the target season of July, August and September for the NE India region (forecasts issued in May) and b.) the target season of September, October and November for the NW India region (forecasts issued in July). The different event categories (read horizontally) are abbreviated as “ > UT” for malaria incidence above the upper tercile, “ > M” for malaria incidence above the median and “ < LT” for malaria incidence below the lower tercile.