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All changes to Zelig are documented here. GitHub issue numbers are given after each change note when relevant. See https://github.com/IQSS/Zelig/issues. External contributors are referenced with their GitHub usernames when applicable.

Zelig version 5.1.6

Major changes

  • All Zelig time series models are deprecated.

Minor changes

  • predit, fitted, residuals now accept arguments. #320

Zelig version 5.1.5

++++ All Zelig time series models will be deprecated on 1 February 2018 ++++

Bug fixes

  • Resolved an issue where odds_ratios standard errors were not correctly returned for logit and relogit models. Thanks to @retrography. #302

  • Zelig 4 compatability wrappers now work for arima models. Thanks to @mbsabath. #280

  • Resolved an error when only setx was called with arima models Thanks to @mbsabath. #299

  • Resolved an error when summary was called after sim for arima models. #305

  • Resolved an error when sim is used with differenced first-order autoregressive models. #307

  • arima models return informative error when data is not found. #308

Minor

  • Compatibility with testthat 2.0.0

  • Documentation updated to correctly reflect that tobit wraps AER::tobit. #315

  • Package terminology in documentation corrected. #316

Zelig version 5.1-4

Major changes

  • Speed improvements made to relogit. Thanks to @retrography. #88

  • Returns relogit weighted case control method to that described in King and Langche (2001, eq. 11) and used in the Stata relogit implementation. #295

  • Odds ratios now returned from summary with relogit models via the odds_ratios = TRUE argument. #302

Zelig version 5.1-3

Major changes

  • Roxygen documentation improvements.

Minor changes and bug fixes

  • zquantile with Amelia imputed data now working. #277

  • vcov now works with rq quantile regression models.

  • More informative error handling for conflicting timeseries model arguments. #283

  • Resolved and issue with relogit that produced a warning when the fitted model object was passed to predict. #291

Zelig version 5.1-2

Major changes

  • !EXPERIMENTAL! interface function to_zelig allows users to convert fitted model objects fitted outside of Zelig to a Zelig object. The function is called within the setx wrapper if a non-Zelig object is supplied. Currently only works for models fitted with lm and many estimated with glm and svyglm. #189

  • get_se and get_pvalue function wrappers created for get_se and get_pvalue methods, respectively. #269

  • If combine_coef_se is given a model estimated without multiply imputed data or bootstraps, an error is no longer returned. Instead a list of the models' untransformed coefficients, standard errors, and p-values is returned. #268

  • summary for logit models now accepts the argument odds_ratios. When TRUE odds ratio estimates are returned rather than coefficient estimates. Thanks to Adam Obeng. PR/#270.

  • setx and sim fail informatively when passed ZeligEI objects. #271

Minor changes and bug fixes

  • Resolved a bug where weights were not being passed to svydesign in survey models. #258

  • Due to limited functionality and instability, zelig survey estimations no return a warning and a link to documentation on how to use to_survey via setx to bipass zelig. #273

  • Resolved a bug where from_zelig_model would not extract fitted model objects for models estimated using vglm. #265

  • get_pvalue and get_se now work for models estimated using vglm. #267

  • Improved ivreg, mlogit, and getter (#266) documentation.

Zelig version 5.1-1

Minor changes

Zelig version 5.1-0

Major changes

  • Introduce a new model type for instrumental-variable regression: ivreg based on the ivreg from the AER package. #223

  • Use the Formula package for formulas. This will enable a common syntax for multiple equations, though currently in Core Zelig it is only enhances ivreg. #241

  • zelig calls now support updateing formulas (#244) and . syntax for inserting all variables from data on the right-hand side of the formula #87. See also #247.

  • Arbitrary log transformations are now supported in zelig calls (exept for ivreg regressors). #225

  • Arbitrary as.factor and factor transformations are now supported in zelig calls.

  • Restored quantile regression (model = "rq"). Currently only supports one tau at a time. #255

  • Added get_qi wrapper for get_qi method.

  • Added ATT wrapper for ATT method.

  • gee models can now be estimated with multiply imputed data. #263

Minor changes and bug fixes

  • zelig returns an error if weights are specified in a model estimated with multiply imputed data. (not possible before, but uninformative error returned)

  • Code improvement to factor_coef_combine so it does not return a warning for model types with more than 1 declared class.

  • Reorganize README files to meet new CRAN requirements.

  • Switch bind_rows for rbind_all in zquantile as the latter is depricated. #255

  • Depends on the survival package in order to enable setx for exponential models without explicitly loading survival. #254

  • relogit now only accepts one tau per call (similar to quantile). Fixed to address #257.

  • Additional unit tests.

Zelig version 5.0-17

Major changes

  • New function combine_coef_se takes as input a zelig model estimated using multiply imputed data or bootstrapping and returns a list of coefficients, standard errors, z-values, and p-values combined across the estimations. Thanks to @vincentarelbundock for prompting. #229

  • The following changes were primarily made to re-established Zelig integration with WhatIf. #236

    • Added zelig_setx_to_df for extracted fitted values created by setx.

    • Fitted factor level variable values are returned in a single column (not by parameter level) by zelig_qi_to_df.

  • setrange (including setx used with a range of fitted values) now creates scenarios based on matches of equal length set ranges. This enables setx to work with polynomials, splines, etc. (currently only when these are created outside of the zelig call). #238

Minor changes and bug fixes

  • Resolve a bug where appropriate plots were not created for mlogitbayes. #206

  • Arguments (such as xlab) can now be passed to plot. #237

  • zelig_qi_to_df and qi_slimmer bug with multinomial response models resolved. #235

  • Resolved a bug where coef, coefficients, vcov, fitted, and predict returned errors. Thanks to @vincentarelbundock for initially reporting. #231

  • Reduced number of digits show from summary for fitted model objects.

Zelig version 5.0-16

Major changes

  • !! Breaking change !! the get* functions (e.g. getcoef) now use underscores _ to delimit words in the function names (e.g. get_coef). #214

  • Added a number of new "getter" methods for extracting estimation elements:

    • get_names method to return Zelig object field names. Also available via names. #216

    • get_residuals to extract fitted model residuals. Also available via residuals.

    • get_df_residuals method to return residual degrees-of-freedom. Also accessible via df.residuals.

    • get_model_data method to return the data frame used to estimate the original model.

    • get_pvalue and get_se methods to return estimated model p-values and standard errors. Thank you to @vincentarelbundock for contributions. #147

  • zelig_qi_to_df function for extracting simulated quantities of interest from a Zelig object and returning them as a tidy-formatted data frame. #189

  • setx returns an error if it is unable to find a supplied variable name.

  • setx1 wrapper added to facilitate piped workflows for first differences.

  • zelig can handle independent variables that are transformed using the natural logarithm inside of the call. #225

Minor changes and bug fixes

  • Corrected an issue where plot would tend to choose a factor level as the x-axis variable when plotting a range of simulations. #226

  • If a factor level variable's fitted value is not specified in setx and it is multi-modal, the last factor in the factor list is arbitrarily chosen. This replaces previous behavior where the level was randomly chosen, causing unuseful quantity of interest range plots. #226

  • Corrected a bug where summary for ranges of setx would only show the first scenario. Now all scenarios are shown. #226

  • Corrected a bug where the README.md was not included in the CRAN build.

  • to_zelig_mi now can accept a list of data frames. Thanks to @vincentarelbundock.

  • Internal code improvements.

Zelig version 5.0-15

Major changes

  • Allows users to convert an independent variable to a factor within a zelig call using as.factor. #213

  • from_zelig_model function to extract original fitted model objects from zelig estimation calls. This is useful for conducting non-Zelig supported post-estimation and easy integration with the texreg and stargazer packages for formatted parameter estimate tables. #189

  • Additional MC tests for a wide range of models. #160

Minor changes

  • Solved deep assignment issue that returned a series of warnings on build. #172

Bug fixes

  • Resolves a bug from set where sim would fail for models that included factor level independent variables. #156

  • Fixed an issue with model-survey where ids was hard coded as ~1. #144

  • Fixed ATT bug introduced in 5.0-14. #194

  • Fixed ci.plot bug with timeseries models introduced in 5.0-15. #204

Zelig version 5.0-14

Major changes

  • mode has been deprecated. Please use Mode. #152

  • The Zelig 4 sim wrapper now intelligently looks for fitted values from the reference class object if not supplied via the x argument.

  • New to_zelig_mi utility function for combining multiply imputed data sets for passing to zelig. mi will also work to enable backwards compatibility. #178

  • Initial development on a new testing architecture and more tests for model-*, Zelig 4 wrappers, ci.plot, and the Zelig workflow.

  • graph method now accepts simulations from setx and setrange. For the former it uses qi.plot and ci.plot for the latter.

  • Improved error messages for Zelig 4 wrappers.

  • Improved error messages if Zelig methods are supplied with too little information.

  • model-arima now fails if the dependent variable does not vary for one of the cases.

Minor changes

  • Minor documentation improvements for Zelig 4 wrappers.

  • Dynamically generated README.md.

  • Removed plyr package dependency.

  • rbind_all replaced by bind_rows as the former is deprecated by dplyr.

  • Other internal code improvements