simstudy 0.1.1

• This is the first submission of simstudy, so there is no news yet!

simstudy 0.1.2

• Fixed index variable issue related to generating categorical data
• Fixed index variable issue related to generating longitudinal data
• Fixed issue that arose when creating categorical variable in first field
• Increased speed required to generate categorical data with large sample sizes
• Categorical data can now accommodate probabilities condition on covariates
• Fix: package data.table 1.10.0 broke genMissDataMat. genMissDataMat has been updated.

simstudy 0.1.3

• Modified “nonrandom” data generation to allow “log”" and “logit”" link options.
• Added function genCorGen - generate a new data.table with correlated data from various distributions.
• Added function addCorData - add correlated data from various distributions to existing data.tables.

simstudy 0.1.4

• Added error check to verify that specified distributions are valid
• Added function genFactor - converts an existing (non-double) field in a data.table to a factor
• Added function genDummy - creates dummy variables from an integer or factor field in a data.table
• Added function defCondition - define distribution conditional on existing fields
• Added function defReadCond - read in conditional definitions from external csv file
• Added function addCondition - generate data based on conditional definition

simstudy 0.1.5

• Added uniform integer distribution (uniformInt)
• Added negative binomial distribution (negBinomial)
• Added exponential distribution (exponential)
• Added function delColumns - deletes one or more columns from data.table

simstudy 0.1.6

• Fixed function genSurv
• Added spline generating functions

simstudy 0.1.7

• Added function genOrdCat - creates ordinal categorical data
• Added function genFormula - creates a linear formula in the form of a string
• Added function updateDef - modify existing data definition table (to be used in genData())
• Added function updateDefData - modify existing data def table (to be used in addColumns())

simstudy 0.1.8

• Fixed function updateDef
• Fixed bug in internal function genbinom
• Added function genCorFlex - generate correlated data from variables that have different marginal distributions
• Added function genCorFlex - generate correlated data from variables that have different marginal distributions, can be dependent on previously defined data

simstudy 0.1.9

• Added function catProbs - to be used to generate categorical data
• Added binomial distribution
• Added ability to specify formula in variance
• Added function genMultiFac - generates multi-factorial design data
• Added function addMultiFac - adds multi-factorial design data
• Added function iccRE - generates required random effect variance for specified intra-class coefficients (ICCs)
• Fixed bug in function genCorFlex
• Fixed bug in numerous functions related to error checking and scoping
• Fixed bug in function addCondition

simstudy 0.1.10

• Added function genCorMat - generate an n x n correlation matrix
• Added function genCorOrdCat - generate correlated ordinal categorical data
• Added beta distribution option to function defData (and associated functions)
• Added function betaGetShapes
• Implemented Emrich and Piedmonte algorithm for correlated binary data for function genCorGen and addCorGen
• Modified function genOrdCat - allows adjVar = NULL
• Fixed bug in function addCorFlex

simstudy 0.1.11

• Added negative binomial option to genCorGen, addCorGen, genCorFlex, and addCorFlex
• Fixed bug in function genFactor
• Added LAG() functionality to missing data generation - updated functions genMiss and added two new internal functions .checkLags and .addLags
• Function catProbs now accepts a vector of probabilities or weights as an argument
• Fixed bugs in function addCondition

simstudy 0.1.12

• Fixed genCorFlex and addMultiFac to accommodate bug fixes with package data.table

simstudy 0.1.13

• Added negative binomial distribution as an option to function iccRE
• Fixed function genCorOrdCat so that it can accept user-specified correlation matrix
• Added function trtStepWedge to generate treatment assignment for a stepped-wedge design cluster randomized trial.

simstudy 0.1.14

• Added functions genMarkov and addMarkov to create data.table with (or add to existing data.table) individual chains of Markov processes.
• Added function genNthEvent to create data.table with binary event outcome in a longitudinal setting.
• Updated function genCluster so that cluster size can be specified as an integer, and will be constant across all clusters.
• Updated function addPeriods that period name can be specified.
• Updated function trtStepWedge so that a transition period can be included.
• Fixed bug in function delColumns related to multiple keys.

simstudy 0.1.15

• Added function trimData (that uses new rcpp function clipVec) to clip or truncate a longitudinal data set after a certain event has occurred.
• Fixed bug in addMarkov, added trimvalue argument to use trimData function
• Added trimvalue argument in genMarkov

simstudy 0.1.16

• Added “mixture” distribution that takes a value from an existing column with a specified probability.
• Modified function trtAssign to improve speed performance of stratified sampling with very large numbers of strata.
• Add argument “ratio” to function trtAssign to allow users to specify more than 1:1 randomization.