boxplot中的na.action有哪些选项？

Question

两个有关boxplot问题：

1. 哪些na.action的选项？文档没有列出它们。
2. 我将如何着手回答这些类型的问题？

Answer 1

一般来说，我发现内置的帮助非常好。你是对的，但boxplot的帮助页面提到na.action没有说明选项是什么。

在这种情况下，?na.action和 - 从那里继 - （这些是相当普遍的，也适用于其他的东西比boxplot）?na.omit解释的可能性

Handle Missing Values in Objects 

Description: 

    These generic functions are useful for dealing with ‘NA’s in e.g., 
    data frames. ‘na.fail’ returns the object if it does not contain 
    any missing values, and signals an error otherwise. ‘na.omit’ 
    returns the object with incomplete cases removed. ‘na.pass’ 
    returns the object unchanged. 

Usage: 

    na.fail(object, ...) 
    na.omit(object, ...) 
    na.exclude(object, ...) 
    na.pass(object, ...) 

Arguments: 

    object: an R object, typically a data frame 

    ...: further arguments special methods could require. 

Details: 

    At present these will handle vectors, matrices and data frames 
    comprising vectors and matrices (only). 

    If ‘na.omit’ removes cases, the row numbers of the cases form the 
    ‘"na.action"’ attribute of the result, of class ‘"omit"’. 

    ‘na.exclude’ differs from ‘na.omit’ only in the class of the 
    ‘"na.action"’ attribute of the result, which is ‘"exclude"’. This 
    gives different behaviour in functions making use of ‘naresid’ and 
    ‘napredict’: when ‘na.exclude’ is used the residuals and 
    predictions are padded to the correct length by inserting ‘NA’s 
    for cases omitted by ‘na.exclude’.