News

**** CHANGES IN STARTS PACKAGE VERSIONS ****

++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Functions for the STARTS model (STARTS) A. Robitzsch & O. Luedtke

mailto:

Alexander Robitzsch [email protected]

For reporting a bug, please always provide a reproducible R script and (if necessary) a corresponding dataset.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++

VERSIONS STARTS 1.1 | 2018-12-13 | Last: STARTS 1.1-6

FIXED * fixed a recently introduced bug in STARTS 1.0 in computing standard errors for proportions of variance in starts_uni_estimate()

DATA * included/modified datasets: --- EXAMP * included/modified examples: ---

VERSIONS STARTS 1.0 | 2018-12-12 | Last: STARTS 1.0-6

NOTE * internal function changes in SE computation of variance proportions in starts_uni_estimate()

DATA * included/modified datasets: --- EXAMP * included/modified examples: ---

VERSIONS STARTS 0.5 | 2018-11-12 | Last: STARTS 0.5-28

NOTE * fixed a warning message if a vector of measurement errors was used in argument 'var_meas_error' in starts_uni_estimate() (thanks to Malte Jansen) NOTE * removed redundant calculations when time_index is submitted NOTE * exported computation of model implied covariance to Rcpp

DATA * included/modified datasets: --- EXAMP * included/modified examples: ---

VERSIONS STARTS 0.4 | 2018-06-08 | Last: STARTS 0.4-24

NOTE * included 'library(sirt)' in ?starts_uni_estimate. The STARTS estimation function needs the dinvgamma2() functions which has to be imported from the 'sirt' package. NOTE * fixed a bug when using 'time_index' as an argument in starts_uni_estimate() NOTE * recent 'STARTS' version depends on LAM (>= 0.3-27) NOTE * included argument 'optim_fct' in starts_uni_estimate() which allows users to choose among optimization methods stats::optim() and stats::nlminb() NOTE * included argument 'use_rcpp' in starts_uni_estimate() which indicates whether Rcpp code should be use in optimization. In some models with many missing data patterns, considerable gains in computation time can be obtained.

DATA * included/modified datasets: --- EXAMP * included/modified examples: ---

VERSIONS STARTS 0.3 | 2018-03-21 | Last: STARTS 0.3-24

NOTE * corrected information criteria in starts_uni_estimate(). The estimate means were ignored in the previous release. FIXED * fixed a bug in starts_uni_estimate() because sirt::dimproper() was not imported in the 'LAM' package ADDED * included univariate estimation of the STARTS model with missing data ADDED * added statistical inference for variance proportions in starts_uni_estimate() function FIXED * fixed a bug in case of missing data in data processing NOTE * added argument 'print_call' in summary.start_uni_estimate() NOTE * changed handling of input of measurement error variances which is now included in the model implied covariance matrix

DATA * included/modified datasets: --- EXAMP * included/modified examples: ---

VERSIONS STARTS 0.2 | 2017-11-24 | Last: STARTS 0.2-10

ADDED * included option for MCMC estimation in starts_uni_estimate() ADDED * added S3 methods plot(), logLik(), coef() and vcov() for starts_uni_estimate() NOTE * moved previous Example 1 from starts_uni() into LAM package

DATA * included/modified datasets: --- EXAMP * included/modified examples: starts_uni_estimate (1)

VERSIONS STARTS 0.1 | 2017-08-27 | Last: STARTS 0.1-51

NOTE * included synthetic datasets adapted to the one used in Luedtke et al. (in press) FIXED * fixed a bug in the STARTS example which prevented the syntax from running correctly (thanks to Judith Biesen) NOTE * extended example in 'starts_cov' which now contains parts of the results and penalized maximum likelihood estimation of the STARTS model NOTE * renamed 'starts_cov' to 'starts_uni_cov'. 'starts_cov' is now deprecated and should be replaced. ADDED * added function 'starts_uni_estimate' for convenient estimation of the univariate STARTS model

DATA * included/modified datasets: data.starts01a, data.starts01b EXAMP * included/modified examples: starts_uni (1,2)

VERSIONS STARTS 0.0 | 2017-05-12 | Last: STARTS 0.0-9

ADDED * moved 'starts_cov' and 'starts_sim1dim' from sirt package to STARTS package

DATA * included/modified datasets: --- EXAMP * included/modified examples: starts_cov (1)

Reference manual