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st: re: estimate precision in MATA: correction

From   Christopher Baum <>
To   <>
Subject   st: re: estimate precision in MATA: correction
Date   Thu, 23 Sep 2010 08:36:10 -0400

My statement "You can't affect the precision with which computations are performed. " is technically incorrect (thanks, Nick!) because there are various Mata functions which enable you to increase the accuracy with which a computation is performed (e.g., quadcross()). However, those functions take arguments which are doubles and return objects which are doubles. Thus, you do not have a choice about the accuracy of Mata numeric objects, although you do have alternatives in computing them---and quadcross() will be much better than an explicit matrix multiplication for ill-conditioned matrices.


Kit Baum   |   Boston College Economics & DIW Berlin   |
                              An Introduction to Stata Programming  |
   An Introduction to Modern Econometrics Using Stata  |

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