ano.difference {agce} | R Documentation |
Performs a simple anova on a vector of measurement (or differences).
Description
This function is a particular case of the manova.growth, the manova
reduces to an ANOVA when the matrix of measurement is a vector. If an
initial time is specified (see initial), the anova is performed on the
differences and rates of growth might be computed.
Usage
ano.difference(data, initial=NULL, final="last", C=NULL, U=NULL, normal=TRUE, B=100, rate=TRUE,time=NULL)
Arguments
data |
The data matrix or data frame, where the first column
correspond to the group ids, the second to the animal ids, the
remaining columns are the measurements at each time. |
initial |
An integer corresponding to the index of the initial time. If
initial is specified, the anova is performed on the
differences. Otherwise only the 'final' measurements are used. |
final |
An integer corresponding to the index of the final time. By
default final is equal to "last" which correspond to the last
measurement. |
C |
The left contrast matrix. Default to the matrix to test equal
means in each group. |
U |
The right contrast matrix. Default to the identity. |
normal |
A logical value, if normal is true the standard
deviations of the rates are computed based on normal assumption of
the measurements, otherwise computed by bootstraping. Default to TRUE. |
B |
A numeric value, the number of bootstraps. Only used if
normal is FALSE. |
rate |
A logical value, if TRUE, the rates are computed. Default
to TRUE. The rate can not be computed if initial is not
specified. |
time |
A vector of numeric values corresponding to the time
points at which the measurements were effectued. Time is absolutely required. |
Value
Ftest |
The value of the F-test used to test the hypothesis
based on C and U. |
df1 |
The numerator degrees of freedom for the F-test |
df2 |
The denominator degrees of freedom for the F-test |
p |
The p-value associated to the F-test |
mean |
The estimate of the mean |
std.mean |
The standard deviation associated to the mean |
rate |
The rate of growth. Set to NULL if rate is FALSE |
std.rate |
The standard deviation of the rates. Set to NULL if rate is FALSE |
Author(s)
Raphael Gottardo
See Also
manova.growth
,growth.curve
Examples
data(Bt20)
ano.difference(Bt20, initial=1, final="last", C=NULL, U=NULL, normal=TRUE, rate=TRUE,time=c(0,3,7,10,14,16))
[Package
agce version 1.2
Index]