Dear all,
I have data on number of certain species in a rotational grazed plot and also
the number of same species in a continuosly grazed one collected for 8 years.
The idea is to check whether there is a change in their proportion as year
progressed. I have tried repeated measures, but was discouraged. A suggestion
to compare proportions was put forward, and i don`t know how to test
significant differences in proportions between the two plots. Part of the data
looks like this:
year Species Continuous Rotational Prop_Cont
Prop_Rot 1992 AB 440 701 0.0484 0.0842 1992 BE 110 165 0.0121
0.0198 1992 BI 308 218 0.0339 0.0262 1992 CP 764 1571 0.0840
0.1886 1992 CV 296 428 0.0325 0.0514 1992 DM 927 681 0.1019
0.0818 1992 ES 114 131 0.0125 0.0157 1992 ESP 531 659 0.0584
0.0791 1992 FB 810 739 0.0891 0.0887 1992 HC 3825 1624 0.4206
0.1950 1992 PN 42 37 0.0046 0.0044 1992 RN 135 47 0.0148 0.0056
1992 SI 177 73 0.0195 0.0088 1992 TB 247 559 0.0272 0.0671
1992 TT 348 694 0.0383 0.0833 1992 UM 21 3 0.0023 0.0004 1992
Total 9095 8330 1993 AB 1031 1270 0.0328 0.0464 1993 BE 8049
4673 0.2557 0.1706 1993 BI 184 318 0.0058 0.0116 1993 CP 680
1333 0.0216 0.0487 1993 CV 2163 1679 0.0687 0.0613 1993 DM 372
444 0.0118 0.0162 1993 ES 71 128
0.0023 0.0047 1993 ESP 709 474 0.0225 0.0173 1993 FB 3913 3946
0.1243 0.1441 1993 HC 4063 1925 0.1291 0.0703 1993 PN 4558 4891
0.1448 0.1786 1993 RN 408 367 0.0130 0.0134 1993 SI 171 520
0.0054 0.0190 1993 TB 4481 4803 0.1423 0.1754 1993 TT 160 406
0.0051 0.0148 1993 UM 467 209 0.0148 0.0076 1993 Total 31480
27386
How do I show that for example there has been a signicant change in
proportion of species AB, in 1993. I want a statistical method of dertemining
that, especially using proportions.
Thanx for the help
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Mr B Moyo
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