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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: AW: How to Reconcile R2 with Economic Significance |

Date |
Wed, 29 Jul 2009 15:14:04 -0400 |

<> What you are describing could mean either of two things: The underlying economic theory is wrong and should be replaced by one supported by the data. Or you are unlucky and have picked a very special dataset that is not representative of the population. You have to make this pick yourself, I am afraid... HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Erasmo Giambona Gesendet: Mittwoch, 29. Juli 2009 10:09 An: statalist Betreff: st: How to Reconcile R2 with Economic Significance Dear Statalist, I am trying to understand how to reconcile statistical and economc significance. Consider a simple model: y = a + b1x1 + b2x2 +e, fitted for panel data and estimated via OLS. Suppose the t-values are respectively 10 and 2 for x1 and x2, implying that x1 contributes more to the R2 for the model. Suppose also that a 1 standard deviation increase in x1 cause y to increase by 2% from its mean while a 1 standard deviation increase in x2 causes y to increase by 25% from its mean. Now, a simple interpretation of a model R2 is that it is a proportion in the variability of y that is accounted for by the model. Accordingly, because of its t-value (and its effect on the R2), x1 would seem to be one of the key drivers of this variabillity in y. However, from an economic point of view, x1 seems to have a very marginal abillity in explaining this variation in y (while x2 seems to be very important). Statistical and economic significance would seem to lead to seemingly "contradicting" results. Can someone provide some suggestions that could help me reconciling statistical and economic significance? Thanks, Erasmo * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: How to Reconcile R2 with Economic Significance***From:*Erasmo Giambona <e.giambona@gmail.com>

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