logLik.ppm(spatstat)
logLik.ppm()所属R语言包:spatstat
Log Likelihood and AIC for Point Process Model
点过程模型的对数似然和AIC
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Extracts the log likelihood, deviance, and AIC of a fitted Poisson point process model, or analogous quantities based on the pseudolikelihood for a fitted Gibbs point process model.
提取的合身Poisson点过程模型,数量或类似的基础上的pseudolikelihood的拟合吉布斯点过程模型的对数似然,偏差,和AIC。
用法----------Usage----------
## S3 method for class 'ppm'
logLik(object, ..., warn=TRUE)
## S3 method for class 'ppm'
extractAIC(fit, scale=0, k=2, ...)
## S3 method for class 'ppm'
nobs(object, ...)
参数----------Arguments----------
参数:object,fit
Fitted point process model. An object of class "ppm".
合身点的流程模型。对象的类"ppm"。
参数:...
Ignored.
忽略。
参数:warn
If TRUE, a warning is given when the pseudolikelihood is returned instead of the likelihood.
如果TRUE,就会发出报警信号时的pseudolikelihood,而不是返回的可能性。
参数:scale
Ignored.
忽略。
参数:k
Numeric value specifying the weight of the equivalent degrees of freedom in the AIC. See Details.
数值指定在AIC自由的同等程度的重量。查看详细信息。
Details
详细信息----------Details----------
These functions are methods for the generic commands logLik, extractAIC and nobs for the class "ppm".
这些功能的通用命令的方法logLik,extractAIC和nobs类"ppm"。
An object of class "ppm" represents a fitted Poisson or Gibbs point process model. It is obtained from the model-fitting function ppm.
一个对象的类"ppm"的代表一个厨房的泊松或吉布斯点过程模型。它是从模型的拟合函数ppm。
The method logLik.ppm computes the maximised value of the log likelihood for the fitted model object (as approximated by quadrature using the Berman-Turner approximation) is extracted. If object is not a Poisson process, the maximised log pseudolikelihood is returned, with a warning (if warn=TRUE).
logLik.ppm的方法计算的对数似然拟合模型object(提取使用伯曼 - 特纳近似值)近似正交的价值最大化。如果object是不是一个泊松过程,则返回最大化logpseudolikelihood的警告(如果warn=TRUE)。
The Akaike Information Criterion AIC for a fitted model is defined as
赤池信息准则AIC的拟合模型定义为
where L is the maximised likelihood of the fitted model, and edf is the effective degrees of freedom of the model. The method extractAIC.ppm returns the analogous quantity AIC* in which L is replaced by L*, the quadrature approximation to the likelihood (if fit is a Poisson model) or the pseudolikelihood (if fit is a Gibbs model).
L是最大化的拟合模型的可能性,和edf是有效度的模型自由。的方法extractAIC.ppm返回类似的数量AIC*的LL*,正交近似的可能性(如果fit是一个泊松模型所取代)或的pseudolikelihood(fit是一个Gibbs模型)。
The method nobs.ppm returns the number of points in the original data point pattern to which the model was fitted.
的方法nobs.ppm返回的原始数据点的模式,模型拟合点的数量。
The R functions AIC and step use these methods.
R功能AIC和step使用这些方法。
值----------Value----------
A numerical value.
一个数值。
(作者)----------Author(s)----------
Adrian Baddeley
<a href="mailto:Adrian.Baddeley@csiro.au">Adrian.Baddeley@csiro.au</a>
<a href="http://www.maths.uwa.edu.au/~adrian/">http://www.maths.uwa.edu.au/~adrian/</a>
and Rolf Turner
<a href="mailto:r.turner@auckland.ac.nz">r.turner@auckland.ac.nz</a>
参见----------See Also----------
ppm, as.owin, coef.ppm, fitted.ppm, formula.ppm, model.frame.ppm, model.matrix.ppm, plot.ppm, predict.ppm, residuals.ppm, simulate.ppm, summary.ppm, terms.ppm, update.ppm, vcov.ppm.
ppm,as.owin,coef.ppm,fitted.ppm,formula.ppm,model.frame.ppm,model.matrix.ppm,plot.ppm,predict.ppm,residuals.ppm,simulate.ppm,summary.ppm,terms.ppm,update.ppm,vcov.ppm。
实例----------Examples----------
data(cells)
fit <- ppm(cells, ~x)
nobs(fit)
logLik(fit)
extractAIC(fit)
AIC(fit)
step(fit)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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