I am looking for an easier way to do a contrast statement in R (rather than multcomp) and came across the contrast package. The syntax seems simple but I keep getting an error. Here is my model and the output (all variables are coded as numeric but WaterDistance and WaterSource are binary, ChildAge is in months).

I am looking for an easier way to do a contrast statement in R (rather than multcomp) and came across the contrast package. The syntax seems simple but I keep getting an error. Here is my model and the output (all variables are coded as numeric but WaterDistance and WaterSource are binary, ChildAge is in months).

I am looking for an easier way to do a contrast statement in R (rather than multcomp) and came across the contrast package. The syntax seems simple but I keep getting an error. Here is my model and the output (all variables are coded as numeric but WaterDistance and WaterSource are binary, ChildAge is in months).

I am looking for an easier way to do a contrast statement in R (rather than multcomp) and came across the contrast package. The syntax seems simple but I keep getting an error. Here is my model and the output (all variables are coded as numeric but WaterDistance and WaterSource are binary, ChildAge is in months).

I am looking for an easier way to do a contrast statement in R (rather than multcomp) and came across the contrast package. The syntax seems simple but I keep getting an error. Here is my model and the output (all variables are coded as numeric but WaterDistance and WaterSource are binary, ChildAge is in months).

I am looking for an easier way to do a contrast statement in R (rather than multcomp) and came across the contrast package. The syntax seems simple but I keep getting an error. Here is my model and the output (all variables are coded as numeric but WaterDistance and WaterSource are binary, ChildAge is in months).