I am a newcomer to the Amelia mailing list and to Amelia. I have a very large dataset (obs = 4696) with 232 variables (45 of which I am marking as idvars to remove them from the imputation model). I am receiving an error message related to my use of the "empri" argument: Error in amelia.default(x = SENSE.3, m = 5, p2s = 2, idvars = c("X", "srvagain", : formal argument "empri" matched by multiple actual arguments because I am a novice user of R, I am not sure where this may be coming from. The code I used was copied from the AmeliaView() option, then modified, so perhaps there are syntax artifacts left over from copying that auto-produced code that I need to change? Thanks for any indications. -Deryl H. PhD student, Univ. of Texas at Austin Full code: a.out.time1 <- amelia( x = SENSE.3, m = 5, p2s = 2, idvars = c("X","srvagain", "termsenr", "newstudentid", "year", "psample", "twoyr", "return", "studage", "in.", "iweight", "newcollegeid", "location", "size", "AccredRegionID", "sense_y2009", "sense_y2010", "Enrollment", "ave_cls", "n_classes", "rate", "AGENEW_2", "AGENEW_3", "AGENEW_4", "AGENEW_5", "AGENEW_6", "AGENEW_7", "AGENEW_8", "AGENEW_9", "ENRLMENT_1", "ENRLMENT_2", "SEX_1", "SEX_2", "RACE_1", "RACE_2", "RACE_4", "RACE_5", "RACE_6", "RACE_7", "RACE_8", "earlycon_inst", "hiexpect_inst", "acadplan_inst", "collread_inst", "engaglrn_inst", "acsocsup_inst"), ts = NULL, cs = NULL, priors = pr.bmarks, lags = NULL, empri = 0, intercs = FALSE, leads = NULL, splinetime = NULL, logs = NULL, sqrts = NULL, lgstc = NULL, ords = c("courseno", "welcome", "wntsccd", "convtime", "aacontim", "aaselmaj", "acadgoal", "crsadv", "oscomm", "fainfo", "qualfa", "actintro", "resource", "gradepol", "syllabi", "facmeet", "cstafnam", "ostudnam", "facnam", "stunam", "ittakes", "acprprd", "askques", "prepdrft", "lateturn", "notturn", "supinstr", "notcompl", "pinclass", "prepoutc", "grpstudy", "nrgstudy", "useintmg", "mailfac", "facassn", "classrel", "feedback", "rcvgrds", "facidoc", "ocideas", "skipcl", "acadpuse", "carcuse", "jobpluse", "fftuse", "oltuse", "sklabuse", "fause", "comlbuse", "storguse", "trnfcras", "disvsuse", "lndstudy", "lndacawk", "lndsklls", "prepclas", "workpay", "hsgrade", "agenew", "degree", "q1", "q2", "q3", "q4", "q5", "q6", "q7", "q8", "q9", "q10", "q11", "q12", "dropno.new", "chgquotient"), noms = c("enter", "nohs", "thisc", "diffc", "myhs", "otherenr", "addrop", "onlorien", "oncorien", "csorien", "nworien", "unaorien", "tkptest", "notest", "needread", "needwrit", "needmath", "neednone", "reqclass", "timeappl", "edcpr", "edcpw", "edcpm", "enrleng", "acadplng", "acadpsat", "careerc", "carcsat", "jobplace", "jobplsat", "fftutor", "fftsat", "oltutor", "oltsat", "skillabs", "sklbsat", "faadvs", "faadvsat", "complab", "comlbsat", "stuorgs", "storgsat", "transfcr", "trcrasat", "disabsvs", "disvsat", "psouraca", "asnpers", "againcl", "mathallf", "mathsnyr", "recocoll", "diversit", "mothed", "fathed", "siblined", "childed", "spouced", "lguarded", "noned", "whitemin", "testdev", "whiteblk", "whitehis", "blkmin", "developm.bin", "regclass.new", "sex.new", "studage.new", "enrlment.new", "firstgen.new", "certprgm.new", "assocdeg.new", "tr4yr.new", "marrstat.new", "children.new", "engnat.new", "internat.new", "reqptest.new", "exptest.new", "enrlssdc.new", "enrlolc.new", "applied.new", "offered.new", "received.new"), bounds = NULL, max.resample = 100, tolerance = 1e-04, empri = 45)