# Compute the Number of Non-missing Observations

### Description

Compute the number of non-missing observations. Provides a 'default' method to handle vectors, and a method for data frames.

### Usage

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### Arguments

`object` |
Target Object |

`...` |
Optional parameters (currently ignored) |

### Details

Calculate the number of observations in `object`

.

For numeric vectors, this is simply the number of non-NA elements, as computed by

`sum(!is.na(object))`

.For dataframe objects, the result is a vector containing the number of non-NA elementes of each column.

The `nobs`

and `nobs.lm`

functions defined in gtools are
simply aliases for the functions in the base R `stats`

package,
provided for backwards compatibility.

### Value

Either single numeric value (for vectors) or a vector of numeric values (for data.frames) giving the number of non-missing values.

### Note

The base R package `stats`

now provides a S3 dispatch function for
`nobs`

, and methods for for objects of classes "lm", "glm",
"nls" and "logLik", as well as a default method.

Since they provided a subset of the the functionality, the base
method dispatch (`nobs`

) function and method for "lm" objects
(`nobs.lm`

) are, as of `gdata`

version 2.10.1, simply
aliases for the equivalent functions in the base R `stats`

package.

Since `gdata`

's default method (`nobs.default`

) processes
vectors and hands any other data/object types to
`stats:::nobs.default`

.

### Author(s)

Gregory R. Warnes greg@warnes.net

### See Also

`is.na`

, `length`

### Examples

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