source: orange/orange/doc/datasets/flare1.htm @ 1760:9d4bb141fb0e

Revision 1760:9d4bb141fb0e, 2.8 KB checked in by blaz <blaz.zupan@…>, 9 years ago (diff)

data info file

Line 
1<html>
2<head>
3<title>Solar Flare Data Base (Data Set #1)</title>
4</head>
5<body>
6<h1>Info on Solar Flare Data Base (Data Set #1)</h1>
7<pre>
81. TItle: Solar Flare database
9
102. Source Information
11   -- Donor: Gary Bradshaw <gbradshaw@clipr.colorado.EDU>
12   -- Date: 3/89
13
143. Past Usage:
15   -- Gary Bradshaw: (Class Attributes were collapsed to 0 and >0)
16   -- See the past-usage file for a note written by Gary Bradshaw
17
184. Relevant Information:
19   -- The database contains 3 potential classes, one for the number of times a
20      certain type of solar flare occured in a 24 hour period.
21   -- Each instance represents captured features for 1 active region on the
22      sun.
23   -- The data are divided into two sections. The second section (flare.data2)
24      has had much more error correction applied to the it, and has
25      consequently been treated as more reliable.
26
275. Number of Instances:  flare.data1: 323, flare.data2: 1066
28
296. Number of attributes:  13 (includes 3 class attributes)
30
317. Attribute Information:
32   1. Code for class (modified Zurich class)  (A,B,C,D,E,F,H)
33   2. Code for largest spot size              (X,R,S,A,H,K)
34   3. Code for spot distribution              (X,O,I,C)
35   4. Activity                                (1 = reduced, 2 = unchanged)
36   5. Evolution                               (1 = decay, 2 = no growth,
37                                               3 = growth)
38   6. Previous 24 hour flare activity code    (1 = nothing as big as an M1,
39                                               2 = one M1,
40                                               3 = more activity than one M1)
41   7. Historically-complex                    (1 = Yes, 2 = No)
42   8. Did region become historically complex  (1 = yes, 2 = no)
43      on this pass across the sun's disk
44   9. Area                                    (1 = small, 2 = large)
45  10. Area of the largest spot                (1 = <=5, 2 = >5)
46
47 From all these predictors three classes of flares are predicted, which are
48 represented in the last three columns.
49
50  11. C-class flares production by this region    Number 
51      in the following 24 hours (common flares)
52  12. M-class flares production by this region    Number
53      in the following 24 hours (moderate flares)
54  13. X-class flares production by this region    Number
55      in the following 24 hours (severe flares)
56
578. Missing values: None
58
599. Class Distribution:
60
61   flare.data1:   
62                    0   1  2  4 Total
63   C-class flares 287  29  7  0 323
64   M-class flares 291  24  6  2 323
65   X-class flares 316   7  0  0 323
66
67   flare.data2:
68
69                    0    1  2  3  4  5  6  7  8  Total
70   C-class flares  884 112 33 20  9  4  3  0  1  1066
71   M-class flares 1030  29  3  2  1  0  1  0  0  1066
72   X-class flares 1061   4  1  0  0  0  0  0  0  1066
73</pre>
74</body>
75</html>
Note: See TracBrowser for help on using the repository browser.