simsum.Rd
simsum
computes performance measures for simulation studies in which each simulated data set yields point estimates by one or more analysis methods. Bias, empirical standard error and precision relative to a reference method can be computed for each method. If, in addition, modelbased standard errors are available then simsum
can compute the average modelbased standard error, the relative error in the modelbased standard error, the coverage of nominal confidence intervals, the coverage under the assumption that there is no bias (biaseliminated coverage), and the power to reject a null hypothesis. Monte Carlo errors are available for all estimated quantities.
simsum(data, estvarname, true, se, methodvar = NULL, ref = NULL, by = NULL, ci.limits = NULL, dropbig = FALSE, x = FALSE, control = list())
data  A 

estvarname  The name of the variable containing the point estimates. 
true  The true value of the parameter. This is used in calculations of bias and coverage. 
se  The name of the variable containing the standard errors of the point estimates. 
methodvar  The name of the variable containing the methods to compare. For instance, methods could be the models compared within a simulation study. Can be 
ref  Specifies the reference method against which relative precision will be calculated. Only useful if 
by  A vector of variable names to compute performance measures by a list of factors. Factors listed here are the (potentially several) datagenerating mechanisms used to simulate data under different scenarios (e.g. sample size, true distribution of a variable, etc.). Can be 
ci.limits  A numeric vector of length 2 specifying the limits (lower and upper) of confidence intervals used to calculate coverage. Useful for nonWald type estimators (e.g. bootstrap). Defaults to 
dropbig  Specifies that point estimates or standard errors beyond the maximum acceptable values should be dropped. Defaults to 
x  Set to 
control  A list of parameters that control the behaviour of

An object of class simsum
.
The following names are not allowed for estvarname
, se
, methodvar
, by
: stat
, est
, mcse
, lower
, upper
.
White, I.R. 2010. simsum: Analyses of simulation studies including Monte Carlo error. The Stata Journal 10(3): 369385. http://www.statajournal.com/article.html?article=st0200
Morris, T.P., White, I.R. and Crowther, M.J. 2019. Using simulation studies to evaluate statistical methods. Statistics in Medicine, doi: 10.1002/sim.8086
Gasparini, A. 2018. rsimsum: Summarise results from Monte Carlo simulation studies. Journal of Open Source Software 3(26):739, doi: 10.21105/joss.00739
data("MIsim", package = "rsimsum") s < simsum(data = MIsim, estvarname = "b", true = 0.5, se = "se", methodvar = "method", ref = "CC") # If 'ref' is not specified, the reference method is inferred s < simsum(data = MIsim, estvarname = "b", true = 0.5, se = "se", methodvar = "method")#>