xy.group {Hmisc} | R Documentation |

## Mean x vs. function of y in groups of x

### Description

Compute mean x vs. a function of y (e.g. median) by quantile groups of x or by x grouped to have a given average number of observations. Deletes NAs in x and y before doing computations.

### Usage

```
xy.group(x, y, m=150, g, fun=mean, result="list")
```

### Arguments

`x` |
a vector, may contain NAs |

`y` |
a vector of same length as x, may contain NAs |

`m` |
number of observations per group |

`g` |
number of quantile groups |

`fun` |
function of y such as median or mean (the default) |

`result` |
"list" (the default), or "matrix" |

### Value

if result="list", a list with components x and y suitable for plotting. if result="matrix", matrix with rows corresponding to x-groups and columns named n, x, and y.

### See Also

### Examples

```
# plot(xy.group(x, y, g=10)) #Plot mean y by deciles of x
# xy.group(x, y, m=100, result="matrix") #Print table, 100 obs/group
```

[Package

*Hmisc*version 5.1-3 Index]