# meanT

From statmod v1.4.20
by Gordon Smyth

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

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

- Keywords
- regression

##### 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.

##### See Also

##### 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
```

*Documentation reproduced from package statmod, version 1.4.20, License: GPL-2 | GPL-3*

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