|
Philip,
I cannot agree more with your
statement:
" So whilst the graph presented is
instructive, I would suggest against
analysing it beyond its use"
Your points illustrate why it is important to
understand what is behind data when analysing it in detail. Incorrect
conclusions can too easily be drawn from data influenced by the data
collection methodology and processing. The question of what constitutes an
incidental record in the COG data and how it is treated when presenting and
analysing the data is of particular interest to me. I have attached below a
summary of the distribution of incidental records for the Australian Hobby
across bird years.
Hopefully the main outcome of presenting any COG data
will be that people become more interested in understanding the
birds.
Steve
Australian Hobby
| Number of
records |
|
|
|
|
| |
Survey Code |
|
|
|
| Bird
Year |
Other than
INC |
INC |
Grand
Total |
INC as
% |
| 2011 |
32 |
|
32 |
0% |
| 2010 |
54 |
|
54 |
0% |
| 2009 |
28 |
3 |
31 |
10% |
| 2008 |
35 |
3 |
38 |
8% |
| 2007 |
41 |
6 |
47 |
13% |
| 2006 |
64 |
5 |
69 |
7% |
| 2005 |
48 |
8 |
56 |
14% |
| 2004 |
18 |
6 |
24 |
25% |
| 2003 |
17 |
8 |
25 |
32% |
| 2002 |
21 |
5 |
26 |
19% |
| 2001 |
18 |
1 |
19 |
5% |
| 2000 |
32 |
|
32 |
0% |
| 1999 |
27 |
|
27 |
0% |
| 1998 |
45 |
4 |
49 |
8% |
| 1997 |
12 |
4 |
16 |
25% |
| 1996 |
15 |
10 |
25 |
40% |
| 1995 |
31 |
|
31 |
0% |
| 1994 |
27 |
|
27 |
0% |
| 1993 |
17 |
|
17 |
0% |
| 1992 |
13 |
|
13 |
0% |
| 1991 |
18 |
|
18 |
0% |
| 1990 |
11 |
|
11 |
0% |
| 1989 |
39 |
|
39 |
0% |
| 1988 |
101 |
|
101 |
0% |
| 1987 |
97 |
|
97 |
0% |
| 1986 |
97 |
|
97 |
0% |
| 1985 |
8 |
|
8 |
0% |
| 1984 |
4 |
|
4 |
0% |
| 1982 |
1 |
|
1 |
0% |
| Grand
Total |
971 |
63 |
1034 |
6% |
| 