sp.assoc(spaa)
sp.assoc()所属R语言包:spaa
Total species association
总种数的关联
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Calculate species association as a whole
作为一个整体,计算种间联结
用法----------Usage----------
sp.assoc(matr)
参数----------Arguments----------
参数:matr
standard species matrix , with rows for plots and columns for species.
标准的物种矩阵,与图的行和列的物种。
Details
详细信息----------Details----------
Calculate species association using the following formula.
使用下面的公式来计算物种关联。
Number of plots.
数图。
N
N
Number of species.
物种数量。
S
S
Number of plots occupied by certain species.
某些物种所占用的图数。
n
n
total number of species for each plot.
每个小区的物种的总数。
Tj
Tj
mean species number for all the plots.
平均物种数为所有的图谋。
t
t
Variance of species relative frequency:
的物种的相对频率的差异:
sigma^{2}{T}= sum{i}=1^{s}P{i}(1-P{i}).
sigma^{2}{T}= sum{i}=1^{s}P{i}(1-P{i})。
Variance of species number:
变异的物种数:
S^{2}{T}=({1}{N})sum{j=1}^{N}(T{j}-t)^{2} .
S^{2}{T}=({1}{N})sum{j=1}^{N}(T{j}-t)^{2} 。
Species reative frequency
种reative频率
P{i}={n{i}}{N}.
P{i}={n{i}}{N}。
Variance ratio:
方差比率:
If VR > 1 Positively associated,
如果VR > 1正相关,
If VR < 1 Negative associated
如果VR < 1负相关
VR = {S{T}^{2}}/{sigma{T}^{2}}
VR = {S{T}^{2}}/{sigma{T}^{2}}
W: used in comparison with chi square with n degrees of freedom.
W:在n个自由度的卡方比较。
W = VR * N
W = VR * N
值----------Value----------
Return Variance ratio, W, Chisq, etc, see details <table summary="R valueblock"> <tr valign="top"><td>pi</td> <td> Species frequency</td></tr> <tr valign="top"><td>N </td> <td> Number of plots</td></tr> <tr valign="top"><td>S</td> <td> Number of species</td></tr> <tr valign="top"><td>Tj</td> <td> Total number of species for each plot</td></tr> <tr valign="top"><td>Numspmean</td> <td> Mean number of species</td></tr> <tr valign="top"><td>sigmaTsq</td> <td> Variance of species relative frequency</td></tr> <tr valign="top"><td>STsq</td> <td> Variance of species number</td></tr> <tr valign="top"><td>var.ratio</td> <td> Variance ratio</td></tr> <tr valign="top"><td>W</td> <td> W statiscit value: used in comparison with chi square.(n)</td></tr> </table>
返回方差比,W,Chisq等,details表summary="R valueblock"> <tr valign="top"> <TD>pi </ TD> <TD>种频率</ TD> </ TR> <tr valign="top"> <TD>N </ TD> <TD>图</ TD> </ TR> <tr valign="top"> <TD> S </ TD> <TD>种数</ TD> </ TR> <tr valign="top"> <TD> Tj </ TD> <TD>总每个小区的物种数</ TD> </ TR> <tr valign="top"> <TD>Numspmean </ TD> <TD>平均物种数</ TD> </ TR> < TR VALIGN =“”> <TD>sigmaTsq </ TD> <TD>物种变异的相对频率</ TD> </ TR> <tr valign="top"> <TD>STsq </ TD> <TD>变异的物种数</ TD> </ TR> <tr valign="top"> <TD>var.ratio </ TD> <TD>方差比</ TD> < / TR> <tr valign="top"> <TD> W </ TD> <TD> W statiscit值与卡方比较(N)</ TD> </ TR> </表>
(作者)----------Author(s)----------
Jinlong Zhang <a href="mailto:jinlongzhang01@gmail.com">jinlongzhang01@gmail.com</a>
参考文献----------References----------
Zhang Qiaoying, Peng Shaolin, Zhang Sumei, Zhang Yunchun, Hou Yuping. (2008) Association of dormintant species in Guia hill Municipal Park of Macao. Ecology and Environment. 17:1541-1547
GUO zhongling, MA yuandan, ZHENG Jiping, LIU Wande , JIN Zefeng.(2004) Biodiversity of tree species,their populations'spatial distribution pattern and interspecific association in mixed deciduous broadleaved forest in Changbai Mountains. Chinese Journal of Applied Ecology. 15:2013-2018
Shi Zuomin, Liu Shirong, Cheng Ruimei, Jiang Youxu.(2001) Interspecific association of plant populations in deciduous broad leaved forest in Baotianman. Scientia Silvae Sinicae. 37:30-35
参见----------See Also----------
See also sp.pair for association between each pair of species.
sp.pair对物种之间的关联。
实例----------Examples----------
data(testdata)
spmatrix <- data2mat(testdata)
sp.assoc(spmatrix)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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