R help - Jan 2021 - Error in contrasts adding bonferroni adjustment

Hello

I am trying to add a Bonferroni adjustment to two comparisons, and I'm
getting an error msg.

The contrasts run just fine; I used a contrast matrix with dummy
variables: Experimental
vs Control at post1 (first contrast) and Experimental vs Control at post2
(second contrast).

contrast.outcome <-contrast(emmeans.outcome, method
list("experimental_post1 - control_post1" = c(1, 0, -1, 0),
"experimental_post2 - control_post2" = c(0, 1, 0, -1), adjust =
"bonf"))

The code runs except when I add the adjust = "bonf" - The error is
"Error
in tcmat %*% linfct : requires numeric/complex matrix/vector arguments"

I see many tutorials online about adjusting in pairwise comparisons and
ANOVA but not in this situation. Any guidance you can provide would be much
appreciated.

Thank you!

Laura

	[[alternative HTML version deleted]]

Looks like a misplaced right parenthesis. Try

contrast.outcome <-contrast(emmeans.outcome, method
list("experimental_post1 - control_post1" = c(1, 0, -1, 0),
"experimental_post2 - control_post2" = c(0, 1, 0, -1)), adjust =
"bonf")

Pat


On Sat, Jan 9, 2021 at 3:10 AM Laura Coco <lauracoco at gmail.com>
wrote:
>
> Hello
>
> I am trying to add a Bonferroni adjustment to two comparisons, and I'm
> getting an error msg.
>
> The contrasts run just fine; I used a contrast matrix with dummy
> variables: Experimental
> vs Control at post1 (first contrast) and Experimental vs Control at post2
> (second contrast).
>
> contrast.outcome <-contrast(emmeans.outcome, method >
list("experimental_post1 - control_post1" = c(1, 0, -1, 0),
> "experimental_post2 - control_post2" = c(0, 1, 0, -1), adjust =
"bonf"))
>
> The code runs except when I add the adjust = "bonf" - The error
is "Error
> in tcmat %*% linfct : requires numeric/complex matrix/vector
arguments"
>
> I see many tutorials online about adjusting in pairwise comparisons and
> ANOVA but not in this situation. Any guidance you can provide would be much
> appreciated.
>
> Thank you!
>
> Laura
>
>         [[alternative HTML version deleted]]
>
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-- 
Patrick S. Malone, Ph.D., Malone Quantitative
NEW Service Models: http://malonequantitative.com

He/Him/His