Time Series Fixes + Deprecation Warning

++++ 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

Relogit bug fixes and odds ratios

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

v5.1-3

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 5.1-0

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.
    Originally intended to re-enable WhatIf integration.

  • 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.

v5.0-16

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 arbitarily 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.