Well, the answer is in the mail you quote and was also discussed in a
recent post. You won't have it with data saved with any of the latest
nightly.
Christiaan
On 24 Sep 2008, at 11:12 PM, darby Jack wrote:
I recently updated to Version 1.3.18 (1202)
After updating, I have been receiving warning messages for hundreds
of entries: " possible runaway string started at line xx"
I note that this issue was discussed previously: http://www.mail-archive.com/[email protected]/msg02985.html
but it doesn't seem that a solution was offered.
Thanks!
Darby
I've copied an entry below that causes the problem:
@article{bertrand2004msw,
Abstract = {Most papers that employ Differences-in-Differences
estimation (DD) use many years of data and focus on serially
correlated outcomes but ignore that the resulting standard errors
are inconsistent. To illustrate the severity of this issue, we
randomly generate placebo laws in state-level data on female wages
from the Current Population Survey. For each law, we use OLS to
compute the DD estimate of its {\"}effect{\"} as well as the
standard error of this estimate. These conventional DD standard
errors severely understate the standard deviation of the estimators:
we find an {\"}effect{\"} significant at the 5 percent level for up
to 45 percent of the placebo interventions. We use Monte Carlo
simulations to investigate how well existing methods help solve this
problem. Econometric corrections that place a specific parametric
form on the time-series process do not perform well. Bootstrap
(taking into account the autocorrelation of the data) works well
when the number of states is large enough. Two corrections based on
asymptotic approximation of the variance-covariance matrix work well
for moderate numbers of states and one correction that collapses the
time series information into a {\"}pre{\"}- and {\"}post{\"}-period
and explicitly takes into account the effective sample size works
well even for small numbers of states.},
Author = {Bertrand, M. and Duflo, E. and Mullainathan, S.},
Date-Added = {2008-09-22 13:02:03 -0400},
Date-Modified = {2008-09-22 13:04:15 -0400},
Journal = {Quarterly Journal of Economics},
Keywords = {differences in differences},
Number = {1},
Pages = {249--275},
Publisher = {MIT Press},
Title = {How Much Should We Trust Differences-in-Differences
Estimates?},
Volume = {119},
Year = {2004},
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