diff --git a/.travis.yml b/.travis.yml
index bfb7745..3b7beea 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ r:
 - devel
 
 r_github_packages:
-  - DoseResponse/drcData
+#  - DoseResponse/drcData
   - r-lib/covr
 
 after_success:
diff --git a/DESCRIPTION b/DESCRIPTION
index c61fc23..9fa82f7 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,11 +1,12 @@
 Package: drc
 Version: 3.2-0
-Date: 2021-01-13
+Date: 2023-04-25
 Title: Analysis of Dose-Response Data
 Authors@R: c(person("Christian" , "Ritz", role = c("aut", "cre"), email="ritz@bioassay.dk"), 
-             person("Jens", "Streibig", middle="C.", email="streibig@bioassay.dk", role = "aut"))
+             person("Jens", "Streibig", middle="C.", email="streibig@bioassay.dk", role = "aut"),
+             person("Ryan", "Ward", role = "ctb"))
 Maintainer: Christian Ritz <ritz@bioassay.dk>
-Depends: R (>= 2.0.0), MASS, stats, drcData
+Depends: R (>= 2.0.0), MASS, stats
 Imports: car, gtools, multcomp, plotrix, sandwich, scales
 LazyLoad: yes
 LazyData: yes
@@ -14,3 +15,4 @@ License: GPL-2
 URL: http://www.r-project.org, http://www.bioassay.dk
 RoxygenNote: 6.1.1
 BugReports: https://github.com/DoseResponse/drc/issues/
+
diff --git a/NAMESPACE b/NAMESPACE
index b841b48..3386207 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -39,7 +39,7 @@ importFrom(scales, alpha)
 #importFrom(stats, cooks.distance, hatvalues)
 #exportMethods(BIC)
 
-import(drcData)
+# import(drcData)
 importFrom("graphics", "abline", "axTicks", "axis", "lines", "par",
             "plot", "points", "polygon", "segments", "text")
 
diff --git a/R/drmOpt.R b/R/drmOpt.R
index a8bb0d2..85a6563 100644
--- a/R/drmOpt.R
+++ b/R/drmOpt.R
@@ -1,3 +1,12 @@
+generateOptimControl <- function(maxIt, relTol, parscale, traceVal, method) {
+  if (method == "L-BFGS-B") {
+    control <- list(maxit = maxIt, factr = relTol, parscale = parscale, trace = traceVal)
+  } else {
+    control <- list(maxit = maxIt, reltol = relTol, parscale = parscale, trace = traceVal)
+  }
+  return(control)
+}
+
 "drmOpt" <- 
 function(opfct, opdfct1, startVec, optMethod, constrained, warnVal, 
 upperLimits, lowerLimits, errorMessage, maxIt, relTol, opdfct2 = NULL, parmVec, traceVal, silentVal = TRUE,
@@ -21,7 +30,7 @@ matchCall)
         {
             nlsObj <- try(optim(startVec, opfct, opdfct1, hessian = hes, method = "L-BFGS-B", 
             lower = lowerLimits, upper = upperLimits, 
-            control = list(maxit = maxIt, reltol = relTol, parscale = psVec)), silent = silentVal)
+            control = generateOptimControl(maxIt, relTol, psVec, traceVal, "L-BFGS-B")), silent = silentVal)
         } else {
             nlsObj <- try(optim(startVec, opfct, opdfct1, hessian = hes, method = optMethod, 
             control = list(maxit = maxIt, reltol = relTol, parscale = psVec)), silent = silentVal)
@@ -54,7 +63,7 @@ matchCall)
 #            print(opfct(startVec))                    
             nlsObj <- try(optim(startVec, opfct, hessian = TRUE, method = "L-BFGS-B", 
             lower = lowerLimits, upper = upperLimits, 
-            control = list(maxit = maxIt, parscale = psVec, reltol = relTol, trace = traceVal)), silent = silentVal)
+            control = generateOptimControl(maxIt, relTol, psVec, traceVal, "L-BFGS-B")), silent = silentVal)
             # parscale is needed for the example in methionine.Rd
         } else {
 #            psVec <- abs(startVec)
diff --git a/R/predict.drc.R b/R/predict.drc.R
index d9de777..b856794 100644
--- a/R/predict.drc.R
+++ b/R/predict.drc.R
@@ -1,18 +1,18 @@
-"predict.drc" <- function(object, newdata, se.fit = FALSE, 
-                          interval = c("none", "confidence", "prediction", "ssd"), 
-                          level = 0.95, na.action = na.pass, od = FALSE, vcov. = vcov, 
+"predict.drc" <- function(object, newdata, se.fit = FALSE,
+                          interval = c("none", "confidence", "prediction", "ssd"),
+                          level = 0.95, na.action = na.pass, od = FALSE, vcov. = vcov,
                           ssdSEfct = NULL, constrain = TRUE, checkND = TRUE, ...)
 {
     ## Checking arguments
     interval <- match.arg(interval)
     respType <- object[["type"]]
 
-    dataList <- object[["dataList"]]    
+    dataList <- object[["dataList"]]
     doseDim <- ncol(dataList[["dose"]])
-    if (is.null(doseDim)) {doseDim <- 1} 
+    if (is.null(doseDim)) {doseDim <- 1}
 
     ## Assigning dataset from object if no data frame is provided
-    if (missing(newdata)) 
+    if (missing(newdata))
     {
 #        predValues <- fitted(object)  # not used
 #        newdata <- data.frame(object$data[, 1], object$data[, 3])
@@ -25,8 +25,8 @@
             groupLevels <- as.character(dataList[["plotid"]])
         } else {
             groupLevels <- as.character(dataList[["curveid"]])
-        }        
-#                
+        }
+#
 #        if (identical(respType, "event"))
 #        {
 #            newdata <- data.frame(dataList[["dose"]], dataList[["plotid"]])
@@ -34,13 +34,13 @@
 #            newdata <- data.frame(dataList[["dose"]], dataList[["curveid"]])
 #        }
     } else {
-        
+
         if (checkND)
-        {  
+        {
             dName <- dataList[["names"]][["dName"]]
             if (any(names(newdata) %in% dName))
             {
-                doseVec <- newdata[, dName]  
+                doseVec <- newdata[, dName]
             } else {
                 doseVec <- newdata[, 1]
 #                warning("Dose variable not in 'newdata'")
@@ -48,33 +48,33 @@
         } else {
             doseVec <- newdata
         }
-        
+
         cName <- dataList[["names"]][["cNames"]]
         if (any(names(newdata) %in% cName))
         {
-            groupLevels <- as.character(newdata[, cName])  
-            # as.character() removes factor encoding  
-          
+            groupLevels <- as.character(newdata[, cName])
+            # as.character() removes factor encoding
+
         } else {
             groupLevels <- rep(1, nrow(newdata))
         }
-#         
-#         
+#
+#
 #         if (ncol(newdata) < (doseDim + 1)) {newdata <- data.frame(newdata, rep(1, nrow(newdata)))}
 # #        ndncol <- ncol(newdata)
 # #        doseVec <- newdata[, 1:(ndncol-1)]
 #         doseVec <- newdata[, 1:doseDim]
-# #        groupLevels <- as.character(newdata[, ndncol])  # 'as.character()' used to suppress factor levels         
-#         groupLevels <- as.character(newdata[, doseDim + 1])  # 'as.character()' used to suppress factor levels         
+# #        groupLevels <- as.character(newdata[, ndncol])  # 'as.character()' used to suppress factor levels
+#         groupLevels <- as.character(newdata[, doseDim + 1])  # 'as.character()' used to suppress factor levels
     }
     noNewData <- length(groupLevels)
-    
+
 #    if (ncol(newdata) < 2) {newdata <- data.frame(newdata, rep(1, nrow(newdata)))}
 #    if (ncol(newdata) > 2) {stop("More than 2 variables in 'newdata' argument")}
-    
-    ## Defining dose values -- dose in the first column!   
+
+    ## Defining dose values -- dose in the first column!
 #    doseVec <- newdata[, 1]
-#    groupLevels <- as.character(newdata[, 2])  # 'as.character()' used to suppress factor levels 
+#    groupLevels <- as.character(newdata[, 2])  # 'as.character()' used to suppress factor levels
 #    noNewData <- length(doseVec)
 
 
@@ -86,9 +86,9 @@
     }
 
     ## Retrieving matrix of parameter estimates
-    parmMat <- object[["parmMat"]] 
+    parmMat <- object[["parmMat"]]
     pm <- t(parmMat[, groupLevels, drop = FALSE])
-           
+
 #    parmNames <- colnames(parmMat)
 #    lenCN <- length(parmNames)
 #    indVec <- 1:lenCN
@@ -96,22 +96,22 @@
 #    if (lenCN > 1)
 #    {
 #        indVec <- indVec[as.character(newdata[, 2])]
-#        
+#
 ##        groupLevels <- newdata[, 2]
 #        if (!all(is.numeric(groupLevels)))
 #        {
-##            pm <- parmMat[, as.character(groupLevels)]  # 'as.character()' used to suppress factor levels            
-#            pm <- parmMat[, groupLevels]            
+##            pm <- parmMat[, as.character(groupLevels)]  # 'as.character()' used to suppress factor levels
+#            pm <- parmMat[, groupLevels]
 #        } else {
 #            pm <- parmMat[, groupLevels]
 #        }
 #        pm <- parmMat[, groupLevels]
-#        
+#
 #    } else {
 #        lenDV <- length(doseVec)
 ##        indVec <- rep(1, lenDV)
 #        pm <- matrix(parmMat[, 1], length(parmMat[, 1]), lenDV)
-#    }    
+#    }
 
 #    ## Checking for NAs in matrix of parameter estimates
 #    naVec <- rep(FALSE, lenCN)
@@ -119,23 +119,23 @@
 #    {
 #        naVec[i] <- any(is.na(parmMat[, i]))
 #    }
-#    parmMat <- parmMat[, !naVec, drop = FALSE] 
+#    parmMat <- parmMat[, !naVec, drop = FALSE]
 
 
     ## Retrieving variance-covariance matrix
     sumObj <- summary(object, od = od)
-#    varMat <- sumObj[["varMat"]]  
-    vcovMat <- vcov.(object)      
+#    varMat <- sumObj[["varMat"]]
+    vcovMat <- vcov.(object)
 
     ## Defining index matrix for parameter estimates
     indexMat <- object[["indexMat"]]
-    
-    ## Calculating predicted values  
-#    indexVec <- as.vector(indVec)  
-#    print(indexVec)  
-#    lenIV <- length(indexVec)    
-    
-    
+
+    ## Calculating predicted values
+#    indexVec <- as.vector(indVec)
+#    print(indexVec)
+#    lenIV <- length(indexVec)
+
+
 #    retMat <- matrix(0, lenIV, 4)
     retMat <- matrix(0, noNewData, 4)
     colnames(retMat) <- c("Prediction", "SE", "Lower", "Upper")
@@ -144,25 +144,25 @@
 #    print(doseVec)
     retMat[, 1] <- objFct$"fct"(doseVec, pm)
 #    print(pm)
-    
+
     ## Checking if derivatives are available
     deriv1 <- objFct$"deriv1"
     if (is.null(deriv1))
     {
-        return(retMat[, 1])        
-    }    
+        return(retMat[, 1])
+    }
 
     ## Calculating the quantile to be used in the confidence intervals
     if (!identical(interval, "none"))
-    {    
+    {
         if (identical(respType, "continuous"))
         {
-            tquan <- qt(1 - (1 - level)/2, df.residual(object))   
+            tquan <- as.vector(qt(1 - (1 - level)/2, df.residual(object)))
         } else {
-            tquan <- qnorm(1 - (1 - level)/2)
+            tquan <- as.vector(qnorm(1 - (1 - level)/2))
         }
-    }  
-    
+    }
+
     ## Calculating standard errors and/or confidence intervals
     if (se.fit || (!identical(interval, "none")))
     {
@@ -171,8 +171,8 @@
         {
             estVec <- object[["dataList"]][["dose"]]
             seVec <- object[["dataList"]][["weights"]]
-            
-            if (is.null(ssdSEfct)) 
+
+            if (is.null(ssdSEfct))
             {
 #                lmObj <- lm(seVec ~ estVec)  # linear, not great
                 lmObj <- lm(log(seVec) ~ log(estVec))
@@ -186,24 +186,24 @@
 #            print(derivxRes)
             # if (is.finite(derivxRes))
             # {
-            #     sumObjRV <- (derivxRes * sePred)^2  
+            #     sumObjRV <- (derivxRes * sePred)^2
             # } else {
-            #     sumObjRV <- 0  # setting Inf * 0 = 0 (would be NaN otherwise) 
-            # } 
+            #     sumObjRV <- 0  # setting Inf * 0 = 0 (would be NaN otherwise)
+            # }
             sumObjRV <- rep(0, length(derivxRes))
-            isFinDR <- is.finite(derivxRes) 
+            isFinDR <- is.finite(derivxRes)
             sumObjRV[isFinDR] <- ((derivxRes * sePred)^2)[isFinDR]
-            
+
 #            print(sumObjRV)
-        } 
+        }
         if (identical(interval, "prediction"))
         {
             sumObjRV <- rep(sumObj$"resVar", noNewData)
-        } 
+        }
         #else {
         #     sumObjRV <- 0
         #  }
-#        rowIndex <- 1    
+#        rowIndex <- 1
 #        for (i in indexVec)
 #        for (i in 1:ncol(indexMat))
 
@@ -214,17 +214,17 @@
         for (rowIndex in 1:noNewData)
         {
 #            parmInd <- indexMat[, i]
-#            print(indexVec) 
+#            print(indexVec)
 #            print(varMat)
-#            print(parmInd)       
-            
+#            print(parmInd)
+
 #            varCov <- varMat[parmInd, parmInd]
 #            print(varCov)
 #            groupLevels <- newdata[, 2]
 #            parmInd <- indexMat[, groupLevels[rowIndex]]
 #            varCov <- varMat[parmInd, parmInd]
 
-            parmInd <- piMat[, rowIndex] 
+            parmInd <- piMat[, rowIndex]
             varCov <- vcovMat[parmInd, parmInd]
 
 #            parmChosen <- t(parmMat[, i, drop = FALSE])
@@ -233,28 +233,28 @@
 
             dfEval <- deriv1(doseVec[rowIndex], pm[rowIndex, , drop = FALSE])
             varVal <- dfEval %*% varCov %*% dfEval
-            retMat[rowIndex, 2] <- sqrt(varVal)  
-#            retMat[rowIndex, 2] <- sqrt(dfEval %*% varCov %*% dfEval)  
+            retMat[rowIndex, 2] <- sqrt(varVal)
+#            retMat[rowIndex, 2] <- sqrt(dfEval %*% varCov %*% dfEval)
 
             if (!se.fit)
             {
-                #retMat[rowIndex, 3:4] <- rep(retMat[rowIndex, 1], 2) + 
+                #retMat[rowIndex, 3:4] <- rep(retMat[rowIndex, 1], 2) +
                 #  (tquan * sqrt(varVal + sumObjRV[rowIndex])) * c(-1, 1)
                 retMat[rowIndex, 3] <- retMat[rowIndex, 1] - tquan * sqrt(varVal + sumObjRV[rowIndex])
-                retMat[rowIndex, 4] <- retMat[rowIndex, 1] + tquan * sqrt(varVal + sumObjRV[rowIndex])   
-            }    
+                retMat[rowIndex, 4] <- retMat[rowIndex, 1] + tquan * sqrt(varVal + sumObjRV[rowIndex])
+            }
 #            if (identical(interval, "confidence"))
 #            {
 #                retMat[rowIndex, 3] <- retMat[rowIndex, 1] - tquan * sqrt(varVal)
-#                retMat[rowIndex, 4] <- retMat[rowIndex, 1] + tquan * sqrt(varVal)            
+#                retMat[rowIndex, 4] <- retMat[rowIndex, 1] + tquan * sqrt(varVal)
 #            }
 #            if (identical(interval, "prediction"))
 #            {
 #                sumObjRV <- sumObj$"resVar"
 #                retMat[rowIndex, 3] <- retMat[rowIndex, 1] - tquan * sqrt(varVal + sumObjRV)
-#                retMat[rowIndex, 4] <- retMat[rowIndex, 1] + tquan * sqrt(varVal + sumObjRV)                        
-#            }          
-#            rowIndex <- rowIndex + 1        
+#                retMat[rowIndex, 4] <- retMat[rowIndex, 1] + tquan * sqrt(varVal + sumObjRV)
+#            }
+#            rowIndex <- rowIndex + 1
         }
     }
     ## Imposing constraints on predicted values
@@ -270,13 +270,11 @@
             retMat[, 3] <- pmax(retMat[, 3], 0)
         }
     }
-    
+
     ## Keeping relevant indices
     keepInd <- 1
     if (se.fit) {keepInd <- c(keepInd, 2)}
     if (!identical(interval, "none")) {keepInd <- c(keepInd, 3, 4)}
-    
+
     return(retMat[, keepInd])  # , drop = FALSE])
 }
-
-
diff --git a/README.Rmd b/README.Rmd
index a051d23..8528a45 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -29,7 +29,7 @@ Analysis of dose-response data is made available through a suite of flexible and
 ## You can install drc from GitHub
 # install.packages("devtools")
 ## first installing drcData
-devtools::install_github("DoseResponse/drcData")
+# devtools::install_github("DoseResponse/drcData")
 ## then installing the development version of drc
 devtools::install_github("DoseResponse/drc")
 ```
diff --git a/README.md b/README.md
index ebea6e5..ca0fd69 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Installation
 ## You can install drc from GitHub
 # install.packages("devtools")
 ## first installing drcData
-devtools::install_github("DoseResponse/drcData")
+# devtools::install_github("DoseResponse/drcData")
 ## then installing the development version of drc
-devtools::install_github("DoseResponse/drc")
+devtools::install_github("ryandward/drc")
 ```
diff --git a/docs/index.html b/docs/index.html
index c1eea05..12f4967 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -75,7 +75,7 @@ <h2 class="hasAnchor">
 <div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r">## You can install drc from GitHub
 <span class="co"># install.packages("devtools")</span>
 ## first installing drcData
-devtools<span class="op">::</span><span class="kw"><a href="http://www.rdocumentation.org/packages/devtools/topics/reexports">install_github</a></span>(<span class="st">"DoseResponse/drcData"</span>)
+# devtools<span class="op">::</span><span class="kw"><a href="http://www.rdocumentation.org/packages/devtools/topics/reexports">install_github</a></span>(<span class="st">"DoseResponse/drcData"</span>)
 ## then installing the development version of drc
 devtools<span class="op">::</span><span class="kw"><a href="http://www.rdocumentation.org/packages/devtools/topics/reexports">install_github</a></span>(<span class="st">"DoseResponse/drc"</span>)</code></pre></div>
 </div>