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Table 1 Month conversion of circular distribution method

From: Spatial and temporal clusters of avian influenza a (H7N9) virus in humans across five epidemics in mainland China: an epidemiological study of laboratory-confirmed cases

Month Days of each month (days) Mid-point days (days) Median angle (degree) Median angle (radian)
1 1–31 15.5 15.288 0.267
2 32–59 45.0 44.384 0.775
3 60–90 74.5 73.479 1.283
4 91–120 105.0 103.562 1.808
5 121–151 135.5 133.644 2.333
6 152–181 166.0 163.726 2.857
7 182–212 196.5 193.808 3.383
8 213–243 227.5 224.383 3.916
9 244–273 258.0 254.465 4.441
10 274–304 288.5 284.548 4.966
11 305–334 319.0 314.630 5.491
12 335–365 349.5 344.712 6.016
  1. Note: The days of a year are distributed to a circular equally