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
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.
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
.
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.
summary
with relogit
models via the
odds_ratios = TRUE
argument. #302zquantile
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 https://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 update
ing formulas (#244) and .
syntax for
inserting all variables from data
on the right-hand side of the formula
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.
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 @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
Resolve a bug where appropriate plot
s 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.
!! 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
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.
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
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
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