Why does summarize or mutate not work with group_by when I load `plyr` after `dplyr`?

rr-faqplyrdplyr
Show Solution

What are the differences between "=" and "<-" assignment operators?

rr-faqassignment-operator
Show Solution

Evaluate expression given as a string

rr-faqeval
Show Solution

How to debug "contrasts can be applied only to factors with 2 or more levels" error?

rr-faqregressionlmglm
Show Solution

Apply several summary functions on several variables by group in one call

rr-faqaggregate
Show Solution
Next

More Tags

gmtdoeventsfor-elseserver-sidereact-jsxresourceshttprequesttype-hintingandroid-buttonclass-designcatstartuphttp-response-codesapp-transport-securityfile-uploadintersectionconstraintsnumericsqliteopenhelperorbital-mechanics