# multicomp.reverse

##### Force all comparisons in a "multicomp" object to have the same sign.

Force all comparisons in a `"multicomp"`

object
to have the same sign. If the contrast `"A-B"`

has a negative estimate,
reverse it show the contrast `"B-A"`

with a positive estimate.
If a contrast name does not include a minus sign `"-"`

and the
contrast is reversed, then an informative message is printed.

- Keywords
- dplot

##### Usage

`multicomp.reverse(y, estimate.sign = 1, ...)`

##### Arguments

- y
`"multicomp"`

object- estimate.sign
If

`estimate.sign==1`

, reverse the negatives. If`estimate.sign==-1`

, reverse the positives. Both the names of the comparisons and the numerical values are reversed. If`estimate.sign==0`

, return the argument.- …
other arguments not used.

##### Value

The result is a `"multicomp"`

object containing the same contrasts
as the argument but with the sign of the contrasts changed as needed.

##### Note

S-Plus use the `multicomp`

functions and R uses the `multcomp`

package.

##### References

Heiberger, Richard M. and Holland, Burt (2015).
*Statistical Analysis and Data Display: An Intermediate Course with Examples in R*.
Second Edition.
Springer-Verlag, New York.
https://www.springer.com/us/book/9781493921218

Heiberger, Richard M. and Holland, Burt (2006).
"Mean--mean multiple comparison displays for families of linear contrasts."
*Journal of Computational and Graphical Statistics*, 15:937--955.

##### See Also

##### Examples

```
# NOT RUN {
## see example in multicomp.order
# }
```

*Documentation reproduced from package HH, version 3.1-42, License: GPL (>= 2)*