meanT {statmod} | R Documentation |

## Mean t-Statistic Between Two Groups of Growth Curves

### Description

The mean-t statistic of the distance between two groups of growth curves.

### Usage

meanT(y1, y2)

### Arguments

`y1` |
matrix of response values for the first group, with a row for each individual and a column for each time. Missing values are allowed. |

`y2` |
matrix of response values for the second group. Must have the same number of columns as `y1` . Missing values are allowed. |

### Details

This function computes the pooled two-sample t-statistic between the response values at each time, and returns the mean of these values weighted by the degrees of freedom.
This function is used by `compareGrowthCurves`

.

### Value

numeric vector of length one containing the mean t-statistic.

### Author(s)

Gordon Smyth

### See Also

`compareGrowthCurves`

, `compareTwoGrowthCurves`

### Examples

y1 <- matrix(rnorm(4*3),4,3)
y2 <- matrix(rnorm(4*3),4,3)
meanT(y1,y2)
data(PlantGrowth)
compareGrowthCurves(PlantGrowth$group,as.matrix(PlantGrowth$weight))
# Can make p-values more accurate by nsim=10000

[Package

*statmod* version 1.2.4

Index]