zero(VGAM)
zero()所属R语言包：VGAM
The zero Argument in VGAM Family Functions
零参数VGAM家庭功能
译者：生物统计家园网 机器人LoveR
描述----------Description----------
The zero argument allows users to conveniently model certain linear/additive predictors as intercepts only.
zero参数，使用户可以方便地模拟线性/添加剂预测仅作为拦截。
Details
详细信息----------Details----------
Often a certain parameter needs to be modelled simply while other parameters in the model may be more complex, for example, the lambda parameter in LMS-Box-Cox quantile regression should be modelled more simply compared to its mu parameter. Another example is the xi parameter in a GEV distribution which is should be modelled simpler than its mu parameter. Using the zero argument allows this to be fitted conveniently without having to input all the constraint matrices explicitly.
通常需要一定的参数进行建模简单，而其他模型中的参数可能会更复杂，例如，lambda LMS-Box-Cox变换分量回归的参数应进行建模更简单相比，它的mu 参数。另一个例子是xi参数GEV分布在它应该比它的mu参数进行建模简单。 zero使用参数允许安装方便，无需输入所有的约束矩阵明确。
The zero argument should be assigned an integer vector from the set {1:M} where M is the number of linear/additive predictors. Full details about constraint matrices can be found in the references.
zero参数应指定一个整数向量从集合{1:M}，其中M是线性/添加剂的预测的。在参考文献中可以找到完整的细节约束矩阵。
值----------Value----------
Nothing is returned. It is simply a convenient argument for constraining certain linear/additive predictors to be an intercept only.
不返回任何值。这是一个简单方便的制约一定的线性/添加剂的预测仅是一个拦截的参数。
警告----------Warning ----------
The use of other arguments may conflict with the zero argument. For example, using constraints to input constraint matrices may conflict with the zero argument. Another example is the argument parallel. In general users should not assume any particular order of precedence when there is potential conflict of definition. Currently no checking for consistency is made.
与zero参数其他参数的使用可能会发生冲突。例如，使用constraints输入约束矩阵zero参数可能会发生冲突。另一个例子是参数parallel。在一般用户不应该假设任何特定的优先顺序时，有可能发生冲突的定义。目前没有一致性的检查。
The argument zero may be renamed in the future to something better.
参数zero在未来可能会更名为更好的东西。
副作用----------Side Effects----------
The argument creates the appropriate constraint matrices internally.
参数创建相应的内部约束矩阵。
注意----------Note----------
In all VGAM family functions zero = NULL means none of the linear/additive predictors are modelled as intercepts-only. Almost all VGAM family function have zero = NULL as the default, but there are some exceptions, e.g., binom2.or.
在所有的VGAM的家庭功能zero = NULL是指没有线性/对添加剂的预测建模为拦截只。几乎所有的VGAM家庭功能zero = NULL为默认值，但也有一些例外，例如，binom2.or。
Typing something like coef(fit, matrix = TRUE) is a useful way to ensure that the zero argument has worked as expected.
键入类似于coef(fit, matrix = TRUE)是一个非常有用的方法，以确保zero工作参数，如预期。
（作者）----------Author(s)----------
T. W. Yee
参考文献----------References----------
Vector generalized additive models. Journal of the Royal Statistical Society, Series B, Methodological, 58, 481–493.
Reduced-rank vector generalized linear models. Statistical Modelling, 3, 15–41.
参见----------See Also----------
constraints.
constraints。
实例----------Examples----------
args(multinomial)
args(binom2.or)
args(gpd)
#LMS quantile regression example[LMS位数回归的例子]
fit = vglm(BMI ~ bs(age, df = 4), lms.bcg(zero = c(1,3)), bmi.nz, trace = TRUE)
coef(fit, matrix = TRUE)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
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发表于 2012-10-1 16:00:33
