whatsnew7.hlp

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1.  {help SpecialEdition:Stata/SE} was released, a new product that allows
    more variables, longer strings, and larger matrices.

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    Stata/SE is not a new release of Stata and so you should not be worried
    that you will be out-of-date if you do not upgrade.  Stata/SE 7 is a
    bigger version of Stata 7.  If any of the limits of Intercooled Stata have
    gotten in your way, Stata/SE provides the solution.

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    See help {help SpecialEdition} for more information and point your browser
    to {browse "http://www.stata.com"} for purchase information.

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2.  {help biprobit}, in the unusual case where robust variance estimates were
    requested and the parameter {cmd:/athrho} was constrained, would produce
    an extraneous message that the constraint was dropped.  The message was
    incorrect, and the constraint was included in the estimation.  This is
    fixed.

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3.  {help bstat} could exit with an unhelpful error message in certain cases
    when calculating the endpoints for the bias-corrected CI; this is
    fixed.

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4.  {help corr2data} and {help drawnorm} could produce the wrong correlation
    structure when the covariance matrix specified in the {cmd:cov()} option
    contained equation names; this is fixed.

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5.  {help ssc} now produces the same informative error messages for those
    using a proxy server as those who do not.

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6.  {help stset} now preserves the sort order of the data.

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7.  {help xtpcse}, when specified with the options {cmd:correlation(psar1)} and
    {cmd:hetonly}, and when the matrix size was declared smaller than the
    number of panels, would issue an error message and refuse to estimate the
    model.  This is fixed.


{title:Stata executable(*)}

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8.  Intercooled Stata has been updated to read the new
    {help SpecialEdition:Stata/SE} .dta file format automatically if the
    dataset does not contain strings longer than {help str:str80} or more than
    2,047 variables.

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9.  {help matsize:set matsize} and {help memory:set memory} have new option
    {cmd:permanent} to set the value and remember it between sessions;
    see help {help matsize} and help {help memory}.

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10.  {help anova} could cause Stata to crash when estimating a model with
     more than 255 terms (a*b counts as one term no matter how many levels
     of a or b there are).  This is fixed.

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11.  The text for the error messages associated with return codes 900 (no room
     to add more variables), 901 (no room to add more observations), 902 (no
     room to add more variables due to width), 903 (no room to promote
     variable), and 908 (matsize too small) has been improved.  If you are
     curious, you can see the improved text by typing {cmd:error 900}, ...,
     {cmd:error 903}, and {cmd:error 908} in the Command window.

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12.  Stata for Macintosh will now properly display line breaks in help files
     created under Windows.


{hline 5} {hi:update 09jan2002} {hline}

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1.  {help heckman:heckman, twostep} did not save e(sample).
    This affected no outputted results and is fixed.

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2.  {help streg:predict} after {cmd:streg, frailty()} has two new options,
    {cmd:alpha1} and {cmd:unconditional}.  {cmd:alpha1} generates predictions
    conditional on a frailty equal to 1.  {cmd:unconditional} generates
    predictions that are unconditional on the frailty.

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    Previously, when fitting a frailty model with {cmd:streg, frailty()}
    without the {cmd:shared()} option, {cmd:predict} would give unconditional
    predictions, and one may now override this default by using the new
    {cmd:alpha1} option.

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    Previously, when fitting a shared frailty model with
    {cmd:streg, frailty() shared()}, predictions from {cmd:predict} were
    conditional on a frailty value of 1, and one may now override this
    default by using the new {cmd:unconditional} option.

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    See help {help streg}.

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3.  {help streg:predict} after {cmd:streg, dist(llogistic) ancillary()} or
    after {cmd:streg, dist(gamma) ancillary() anc2()} sometimes gave
    predictions based on erroneous estimates of the ancillary parameter(s).
    The estimated ancillary parameters should vary with the data, yet the
    parameters were sometimes held fixed at their values for {cmd:_n==1} when
    the predictions were calculated.  This is fixed.

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4.  {help streg:predict} after {help streg} handles {cmd:if} and {cmd:in}
    conditions more efficiently (it runs faster).

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5.  {help svydes}, {help svymean}, {help svyprop}, {help svyratio},
    {help svytab}, and {help svytotal} now preserve the sort order of the
    data.


{hline 5} {hi:update 20dec2001} {hline}

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1.  {help ivreg} no longer lists perfectly collinear variables in
    {cmd:e(insts)}.

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2.  {help pac} (and {help corrgram} since it calls {cmd:pac}) would overwrite
    any existing {cmd:e()} results with the results from the regression
    computed within {cmd:pac}.  Now the previous {cmd:e()} results
    are restored.

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3.  {help treatreg} would report a "conformability error" and fail to run when
    there were perfect predictors in the treatment equation; this is fixed.

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4.  {help xtreg} now issues a more appropriate error message when the panel
    variable is collinear with the independent variables.

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5.  {help xtregar:xtregar, fe} did not save {cmd:e(rmse)}; this is fixed.


{hline 5} {hi:update 11dec2001} {hline}

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1.  {help streg} has new option {cmd:shared(}{it:varname}{cmd:)} for fitting
    parametric shared frailty models, analogous to random effects models for
    panel data:  the frailty value is common among groups of observations and
    randomly distributed across groups.  {cmd:streg} could and still can
    estimate frailty models where the frailties are assumed to be randomly
    distributed at the observation level (specify option {cmd:frailty()}
    without the new option {cmd:shared()}).  See help {help streg}.

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2.  On-line help and search index updated to include reference to more of the
    material available at {browse "http://www.ats.ucla.edu/stat/stata/"}.

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3.  {help adjust} now allows the {cmd:pr} option when used after
    {help svylogit}, {help xtlogit}, {help svyprobit}, and {help xtprobit}.

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4.  {help arima} with the unusual combination of a model with no covariates
    and with options {cmd:from(armab0)} and {cmd:noconstant} specified, would
    issue an error message and refuse to estimate the model; this is fixed.

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5.  {help findit} without the {cmd:saving()} option now places the file
    _finditresults.smcl in the directory specified by the
    {help macro:global macro} {cmd:FINDIT_DIR} if defined or the current
    directory if not.

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6.  {help linktest} now works after {help stcox} and {help streg}.

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7.  {help nlogit} with the {help by} prefix command would present results for
    the complete sample after presenting the results for each by group.  Now
    it presents only the results for each by group.

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8.  {help roccomp:roccomp, graph} now accepts the {cmd:l2title()}
    {help gr7axes:graph} option.  Additionally, {cmd:roccomp, graph binormal}
    now allows {help gr7color:graph}'s {cmd:pen()} option.

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    {cmd:roccomp, graph} used to assign a key to the 45-degree line in the
    graph.  It no longer does, instead providing keys only for the actual
    curves.

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9.  {help roctab} has a new option {cmd:specificity} to graph sensitivity
    versus specificity, instead of the default sensitivity versus
    (1-specificity); see help {help roctab}.

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10.  {help treatreg:treatreg, twostep} did not save e(sample); this is fixed.

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11.  {help prais} could, due to collinearity, drop the dependent variable;
    this is fixed.

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12.  {help zip} and {help zinb} now accept the {cmd:from()} option.


{hline 5} {hi:update 07dec2001} {hline}

{title:Stata executable(*), Windows}

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1.  The 06dec2001 fix for the on-going problem in which the mouse could not be
    used to select text in edit fields under Windows 2000 and XP created a
    problem for Windows 95 and 98; that is fixed.


{hline 5} {hi:update 06dec2001} {hline}

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1.  {help ml} unnecessarily left behind matrices named ML_CT and ML_Ca
    after estimation with {cmd:constraints()}.

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    {cmd:ml} now saves the constraint matrix in internal matrix Cns which
    can be obtained by typing "{cmd:matrix} {it:name} {cmd:=} {cmd:get(Cns)}".

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    {cmd:ml display} now displays any constraints associated with the
    estimates.

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    Note, there was nothing wrong with any results produced by {cmd:ml}; these
    changes merely affect how results are stored and displayed.


{title:Stata executable(*)}

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2.  In downloading from the SSC Archive, Stata would occasionally
    (some would say often) produce the error message "I/O error" and you would
    have to try again.  This is fixed.  (Stata now watches for the problem and
    reestablishes the connection.)

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3.  In {help exp:expressions}, FORTRAN syntax such as "1d+2" was not
    understood to mean 100 despite the documentation's claim otherwise.
    Now 1d+2 and even 1d2 are understood.

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4.  {help foreach} and {help forvalues} now respond more promptly to the
    Break key.

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5.  {help ivreg:ivreg, beta} produced random values for the betas
    (standardized coefficients); this is fixed.  Coefficients, standard errors,
    t-statistics, etc., were all correct.

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6.  {help mlogit} previously printed any constraints before the iteration
    log; it now prints them after the log and before the coefficient table.
    Note, there was nothing wrong with any results produced by {cmd:mlogit};
    this change merely affects how results are displayed.

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7.  {help syntax} allows new syntactical element {it:anything};
    see help {help syntax}.

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8.  If you are programming in the dialog boxes created by
    {help window:window dialog}, you now can repopulate a combo box by
    changing the contents of the macro associated with it.

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9.  (Windows)
    The permanent, more elegant fix promised in the 27oct2001 update for the
    on-going problem in which the mouse cannot be used to select text in edit
    fields under Windows 2000 or XP has been found and implemented.
    If you have {cmd:set cmdtitle off} in order to work around the bug and
    want the title back, set the {cmd:cmdtitle} back on.

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10.  (Windows)
    Multiple instances of Stata running at the same time are now clearly
    marked in their title bar with an instance number.

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11.  (Windows)
    Results and Viewer windows now have contextual menus; right-click when you
    are in the window to try it.

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12.  (Windows and Macintosh)
     {help rmsg:set rmsg} could report the decimal portions of timings
     incorrectly; this is fixed.

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13.  (Macintosh)
    You can now select all of the contents of the Results or Viewer windows by
    selecting {hi:Select All} from the {hi:Edit} menu.

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14.  (Macintosh)
    Any errors that occur when printing are now reported.  Previously, Stata
    relied on the Finder to report printing problems which, in some cases, it
    did not.

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15.  (Macintosh)
    Clicking in the Variables window will now overwrite selected text in the
    Command window.

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16.  (Unix GUI)
    Printing the Results or Viewer windows through the Print dialog box
    would sometimes fail; this is fixed.

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17.  (Unix GUI)
     {help window:window menu} did not allow appending to the default Stata
     menus when the keyword {cmd:sysmenu} was enclosed in quotes; this is
     fixed.

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18.  (Unix GUI)
    If a minimized window was selected from the {hi:Window} menu, Stata
    sometimes crashed; this is fixed.


{hline 5} {hi:update 14nov2001} {hline}

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1.  On-line help and search index brought up-to-date for
    {help sj:Stata Journal 1(1)}.

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2.  {help loneway} with the {cmd:exact} option produced correct results, but
    displayed spurious {help smcl} commands in a table header; this is fixed.

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3.  {help ml:ml model, waldtest(0)}, rather than executing, produced an error
    message; this is fixed.

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