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o Support for aliased coefficients in ivreg() (suggested and tested by
Liviu Andronic).
o New data sets GoldSilver, MotorCycles2 and MSCISwitzerland, taken from
Franses, van Dijk, Opschoor (2014): "Time Series Models for Business and
Economic Forecasting", 2nd ed. For replication of the corresponding
examples, several packages were added to the list of 'suggested' packages
(including fGarch, forecast, longmemo, rugarch, vars).
o Small improvements in DESCRIPTION/Imports and NAMESPACE for R CMD check.
Changes in Version 1.2-4
o Reference output updated for recent versions of R.
Changes in Version 1.2-3
o Package "splines" is loaded explicitly if needed (rather than assuming
that it is loaded along with "survival").
o Some URLs in the manual pages had been outdated and are updated (or omitted)
now.
Changes in Version 1.2-2
o Another bug fix in the new summary(ivreg_object, diagnostics = TRUE). If
sandwich standard errors (or other vcov) were used, the chi-squared form
rather than the F form of the diagnostic Wald tests was computed and hence
the p-values were incorrect.
o If there is more than one endogenous variable, summary(ivreg_object,
diagnostics = TRUE) now reports separate tests of weak instruments for
each endogenous variable.
Changes in Version 1.2-1
o Bug fix in the new summary(ivreg_object, diagnostics = TRUE). If there
is more than one endogenous variable, the degrees of freedom (and hence
the associated p-values) for the Sargan test were too large.
o The examples employing "rgl" for 3d visualizations (e.g., for the SIC33
data) are not tested anymore in R CMD check (as "rgl" currently has some
problems on CRAN's checks for OS X).
Changes in Version 1.2-0
o The summary() method for ivreg() now has a diagnostics=FALSE argument.
If set to TRUE, three diagnostic tests are performed: an F test of
the first stage regression for weak instruments, a Wu-Hausman test
for endogeneity, and a Sargan test of overidentifying restrictions
(only if there are more instruments than regressors).
o Added new data set EquationCitations provided by Fawcett & Higginson
(2012, PNAS).
o Changes in Depends/Imports/Suggests due to new CRAN check requirements.
In particular, the "Formula" package is now only imported (but not
loaded into the search path).
Changes in Version 1.1-9
o Recompressed data sets in package to reduce file storage requirements.
o ivreg() failed when used without instruments. Now fixed.
o The summary() for ivreg() displayed the degrees of freedom of the
overall Wald test incorrectly (although the p-value was computed
correctly).
o Some technical changes for new R 2.14.0, e.g., adding Authors@R in
DESCRIPTION, recompressing data, etc.
Changes in Version 1.1-8
o The hat values for instrumental variables regressions are now
computed in the hatvalues() method and not within ivreg.fit()
to save computation time for large data sets.
o Added nobs() method for "survreg" objects (and thus "tobit" objects).
Modified "ivreg" objects so that default nobs() methods works.
o Labeling in coeftest() method for "multinom" objects with
binary responses has been fixed.
o Example 21.4 in ?Greene2003 now employs the scaled regressor
fincome/10000.
Changes in Version 1.1-7
o Adapted some example in ?Greene2003 in order to work both with
the old and new "dynlm" package. dynlm() now provides convenient
support for linear time trends via dynlm(y ~ trend(y)) etc.
Changes in Version 1.1-6
o Adapted code/examples/tests to new car version which has deprecated
linear.hypothesis() in favor of linearHypothesis().
Changes in Version 1.1-5
o CPS1985 now has 534 observations (not 533 as in prior releases),
the original observation 1 had been omitted inadvertently. See
also the errata in vignette("AER", package = "AER").
o Data and examples for Winkelmann and Boes (2009),
"Analysis of Microdata" (2nd ed.) have been added. For details and
extensive (but not quite complete) replication code see
help("WinkelmannBoes2009") as well as help("GSS7402") and
help("GSOEP9402").
o As announced in the changes for version 1.1-0 of the "AER" package,
the variable "earnings" has now been removed from the
PSID1976 (aka Mroz) data. In 1.1-0 it was renamed to "wage"
to avoid confusion with other data sets.
o The coeftest() method for "polr" objects used to return wrong
standard errors (and hence wrong z tests) for the last intercept.
This was caused by an inconsistency between the summary() and
vcov() methods for "polr" objects which has been improved in
recent versions of the "MASS" package. The correct results are
computed by coeftest() for "polr" objects computed with MASS
version >= 7.3-6. See also the errata in vignette("AER",
package = "AER")
o The paper describing the various versions of the Grunfeld data
has been accepted for publication in the German Economic Review.
An updated version of the manuscript and associated replication
files -- mostly based on data("Grunfeld", package = "AER") --
is available from http://statmath.wu.ac.at/~zeileis/grunfeld/.
o Added lrtest() method for "fitdistr" objects with intelligible
model name (instead of the usual formula for formula-based models).
Changes in Version 1.1-4
o ivreg() now uses the "Formula" package (>= 0.2-0) for processing
of its model formulas. However, this only affects the internal
computations, the user interface has remained unchanged.
o Numerous spelling improvements in the documentation (thanks to
the new aspell() functionality in base R).
Changes in Version 1.1-3
o Added PSID7682 data set which contains the full Cornwell & Rupert
(1988) panel data for the years 1976-1982. This should be used
for estimation of the Hausman-Taylor model in Exercise 6 from
Chapter 3 (instead of PSID1982 which does not provide panel data
but only the cross-section for 1982). See the errata and the
manual page for more details.
o Fixed overall Wald test in summary() for "tobit" models
with intercept only.
Changes in Version 1.1-2
o New errata item in vignette("AER", package = "AER"): The comment
regarding the output from the Johansen test (p. 169) is in error.
The null hypothesis of no cointegration is not rejected at the
10% level (only at 15% level).
o Enhancements of the CigarettesSW examples from Stock & Watson.
o Fixed overall Wald test in summary() for "tobit" models
without intercept.
o Improved "rgl" code in the SIC33 example.
o The variable "gender" in the Parade2005 data set was
wrong for observation 70. It is now "male" (not "female").
Changes in Version 1.1-1
o A new improved version of the "plm" package is available
from CRAN (version 1.1-1). This fixes a bug in the summary()
of "plm" objects, see the vignette/errata for details.
Furthermore, there is now a vcovHC() method for "panelmodel"
objects: It gives equivalent results to pvcovHC() but
is now the recommended user interface and hence used
in the examples of some manual pages (see e.g. ?Fatalities).
Changes in Version 1.1-0
o Some variable names in the PSID1976 (aka Mroz) data
have been renamed: "earnings" is now called "wage"
(to avoid confusion with other data sets), the previous
variable "wage" is renamed as "repwage" (reported wage).
Currently, "earnings" is kept; it will be removed in future
releases.
o Documentation of the Grunfeld data has been enhanced and
updated. Much more details are available in a recent
technical report: Kleiber and Zeileis (2008), "The
Grunfeld Data at 50", available from http://epub.wu-wien.ac.at/.
o Multinomial logit examples using Yves Croissant's "mlogit"
package have been added for the TravelMode and BankWages
data sets.
o Vignette/errata updated.
Changes in Version 1.0-1
o Small changes for R 2.8.0.
Changes in Version 1.0-0
o official version accompanying the release of the
book (contains all code from the book in demos
and tests)
o See the new
vignette("AER", package = "AER")
for an overview of the package and a list of errata.
Changes in Version 0.9-0
o release of the version used for compiling the final
version of the book for Springer
Changes in Version 0.2-0
o first CRAN release of the AER package
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