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.
predit, fitted, residuals now accept arguments. #320++++ All Zelig time series models will be deprecated on 1 February 2018 ++++
Resolved an issue where odds_ratios standard errors were not correctly returned for logit and relogit models. Thanks to @retrography. #302
arima models. Thanks tosetx was called with arima models Thanks toResolved 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
Compatibility with testthat 2.0.0
Documentation updated to correctly reflect that tobit wraps AER::tobit. #315
Package terminology in documentation corrected. #316
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
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
!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
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.
Average Treatment Effect on the Treated (ATT) vignette added to the online documentation http://docs.zeligproject.org/articles/att.html
Corrected vignette URLs.
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
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.
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 3 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
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 3 for initially reporting. #231
Reduced number of digits show from summary for fitted model objects.
!! 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 3 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
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 toAllows 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
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
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 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