billvenablescsiroau hi mark always produce prediction data set use pv predictmodel newdata pdata se true pretty straightforward build data set like pdata witholddata expandgridgroup levelsgroup value meanvalue probably need try look see would advise also omit data argument fitting function r terms bad practice thats another story bill venables httpwwwcmiscsiroaubillvenables propaganda alma negocio _____ mark tuscan mailtomarktuscangmailcom sent wednesday 6 august 2008 342 pm venables bill cmis cleveland rhelprprojectorg subject r calculate glm least square means hi bill thanks reply work sas people may picked jargon ive also heard least square means referred marginal means understand group means controlled covariate ie holding constant typical value covariate mean value example model specified modelglmcountvaluegroupquasipoisson count explained value group continuous categorical predictors respectively would like calculate mean counts group controlling value ie holding constant thank mark tuscan phd candidate cornell university date tue aug 5 2008 941 pm subject r calculate glm least square means mtb954gmailcom rhelprprojectorg explain least square mean sounds like sas talk also care tell us really bill venables httpwwwcmiscsiroaubillvenables propaganda alma negocio original message rhelpbouncesrprojectorg mailtorhelpbouncesrprojectorg behalf mtb954 sent wednesday 6 august 2008 109 pm rhelprprojectorg subject r calculate glm least square means hello rhelpers would like calculate least square means built glm quasipoisson errors model dependent variable continuous one continuous independent variable one categorical independent variable variable would like calculate least square means ive looked around command calculate least square means cant find thanks help mark alternative html version deleted ______________________________________________ rhelprprojectorg mailing list httpsstatethzchmailmanlistinforhelp please read posting guide httpwwwrprojectorgpostingguidehtml provide commented minimal selfcontained reproducible code alternative html version deleted wed 06 aug 2008 161248 1000 r calculate glm least square means