{"id":27811,"date":"2024-03-04T03:30:37","date_gmt":"2024-03-04T04:30:37","guid":{"rendered":"https:\/\/express24.ir\/d\/product\/%d9%85%d9%82%d8%a7%d9%84%d9%87-%d8%a7%d8%b3%d8%aa%d9%86%d8%aa%d8%a7%d8%ac-%d9%82%d9%88%db%8c-%d8%af%d8%b1-%d9%85%d8%af%d9%84%d9%87%d8%a7%db%8c-%d8%af%d8%a7%d8%af%d9%87-%d9%be%d8%a7%d9%86%d9%84-%d8%a8\/"},"modified":"2024-03-04T03:30:38","modified_gmt":"2024-03-04T04:30:38","slug":"%d9%85%d9%82%d8%a7%d9%84%d9%87-%d8%a7%d8%b3%d8%aa%d9%86%d8%aa%d8%a7%d8%ac-%d9%82%d9%88%db%8c-%d8%af%d8%b1-%d9%85%d8%af%d9%84%d9%87%d8%a7%db%8c-%d8%af%d8%a7%d8%af%d9%87-%d9%be%d8%a7%d9%86%d9%84-%d8%a8","status":"publish","type":"product","link":"https:\/\/express24.ir\/d\/product\/%d9%85%d9%82%d8%a7%d9%84%d9%87-%d8%a7%d8%b3%d8%aa%d9%86%d8%aa%d8%a7%d8%ac-%d9%82%d9%88%db%8c-%d8%af%d8%b1-%d9%85%d8%af%d9%84%d9%87%d8%a7%db%8c-%d8%af%d8%a7%d8%af%d9%87-%d9%be%d8%a7%d9%86%d9%84-%d8%a8\/","title":{"rendered":"\u0645\u0642\u0627\u0644\u0647 \u0627\u0633\u062a\u0646\u062a\u0627\u062c \u0642\u0648\u06cc \u062f\u0631 \u0645\u062f\u0644\u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u067e\u0627\u0646\u0644: \u0628\u0631\u062e\u06cc \u0627\u0632 \u0627\u062b\u0631\u0627\u062a \u0646\u0627\u0647\u0645\u06af\u0648\u0646\u06cc \u0648 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0627\u0647\u0631\u0645\u06cc \u062f\u0631 \u0646\u0645\u0648\u0646\u0647 \u0647\u0627\u06cc \u06a9\u0648\u0686\u06a9"},"content":{"rendered":"<table class=\"table table-striped table-hover\">\n<tbody>\n<tr>\n<td>\u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc <\/td>\n<td>Robust Inference in Panel Data Models: Some Effects of Heteroskedasticity and Leveraged Data in Small Samples<\/td>\n<\/tr>\n<tr>\n<td>\u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc <\/td>\n<td>\u0645\u0642\u0627\u0644\u0647 \u0627\u0633\u062a\u0646\u062a\u0627\u062c \u0642\u0648\u06cc \u062f\u0631 \u0645\u062f\u0644\u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u067e\u0627\u0646\u0644: \u0628\u0631\u062e\u06cc \u0627\u0632 \u0627\u062b\u0631\u0627\u062a \u0646\u0627\u0647\u0645\u06af\u0648\u0646\u06cc \u0648 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u0627\u0647\u0631\u0645\u06cc \u062f\u0631 \u0646\u0645\u0648\u0646\u0647 \u0647\u0627\u06cc \u06a9\u0648\u0686\u06a9<\/td>\n<\/tr>\n<tr>\n<td>\u0646\u0648\u06cc\u0633\u0646\u062f\u06af\u0627\u0646 <\/td>\n<td>Annalivia Polselli<\/td>\n<\/tr>\n<tr>\n<td>\u0632\u0628\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 <\/td>\n<td>\u0627\u0646\u06af\u0644\u06cc\u0633\u06cc<\/td>\n<\/tr>\n<tr>\n<td>\u0641\u0631\u0645\u062a \u0645\u0642\u0627\u0644\u0647: <\/td>\n<td>PDF<\/td>\n<\/tr>\n<tr>\n<td>\u062a\u0639\u062f\u0627\u062f \u0635\u0641\u062d\u0627\u062a<\/td>\n<td>33<\/td>\n<\/tr>\n<tr>\n<td>\u062f\u0633\u062a\u0647 \u0628\u0646\u062f\u06cc \u0645\u0648\u0636\u0648\u0639\u0627\u062a  <\/td>\n<td>Econometrics,Computation,\u0627\u0642\u062a\u0635\u0627\u062f \u0633\u0646\u062c , \u0645\u062d\u0627\u0633\u0628\u0647 ,<\/td>\n<\/tr>\n<tr>\n<td>\u062a\u0648\u0636\u06cc\u062d\u0627\u062a    <\/td>\n<td>Submitted 29 December, 2023; originally announced December 2023.<\/td>\n<\/tr>\n<tr>\n<td>\u062a\u0648\u0636\u06cc\u062d\u0627\u062a \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc    <\/td>\n<td>\u0627\u0631\u0633\u0627\u0644 \u0634\u062f\u0647 29 \u062f\u0633\u0627\u0645\u0628\u0631 2023 \u061b\u062f\u0631 \u0627\u0628\u062a\u062f\u0627 \u062f\u0633\u0627\u0645\u0628\u0631 2023 \u0627\u0639\u0644\u0627\u0645 \u0634\u062f.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u0686\u06a9\u06cc\u062f\u0647<\/h2>\n<p style=\"direction:ltr;\">With the violation of the assumption of homoskedasticity, least squares estimators of the variance become inefficient and statistical inference conducted with invalid standard errors leads to misleading rejection rates. Despite a vast cross-sectional literature on the downward bias of robust standard errors, the problem is not extensively covered in the panel data framework. We investigate the consequences of the simultaneous presence of small sample size, heteroskedasticity and data points that exhibit extreme values in the covariates (&#8216;good leverage points&#8217;) on the statistical inference. Focusing on one-way linear panel data models, we examine asymptotic and finite sample properties of a battery of heteroskedasticity-consistent estimators using Monte Carlo simulations. We also propose a hybrid estimator of the variance-covariance matrix. Results show that conventional standard errors are always dominated by more conservative estimators of the variance, especially in small samples. In addition, all types of HC standard errors have excellent performances in terms of size and power tests under homoskedasticity.<\/p>\n<h2>\u0686\u06a9\u06cc\u062f\u0647 \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc (\u062a\u0631\u062c\u0645\u0647 \u0645\u0627\u0634\u06cc\u0646\u06cc)<\/h2>\n<p>\u0628\u0627 \u0646\u0642\u0636 \u0641\u0631\u0636 \u0647\u0645\u062c\u0646\u0633\u06af\u0631\u0627 \u060c \u062d\u062f\u0627\u0642\u0644 \u0628\u0631\u0622\u0648\u0631\u062f\u06af\u0631\u0647\u0627\u06cc \u0645\u0631\u0628\u0639 \u0627\u0632 \u0648\u0627\u0631\u06cc\u0627\u0646\u0633 \u0646\u0627\u06a9\u0627\u0631\u0622\u0645\u062f \u0645\u06cc \u0634\u0648\u0646\u062f \u0648 \u0627\u0633\u062a\u0646\u0628\u0627\u0637 \u0622\u0645\u0627\u0631\u06cc \u0627\u0646\u062c\u0627\u0645 \u0645\u06cc \u0634\u0648\u062f \u06a9\u0647 \u0628\u0627 \u062e\u0637\u0627\u0647\u0627\u06cc \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f \u0646\u0627\u0645\u0639\u062a\u0628\u0631 \u0627\u0646\u062c\u0627\u0645 \u0645\u06cc \u0634\u0648\u062f \u060c \u0645\u0646\u062c\u0631 \u0628\u0647 \u06af\u0645\u0631\u0627\u0647 \u06a9\u0646\u0646\u062f\u0647 \u0646\u0631\u062e \u0631\u062f \u0645\u06cc \u0634\u0648\u062f.\u0639\u0644\u06cc\u0631\u063a\u0645 \u0627\u062f\u0628\u06cc\u0627\u062a \u06af\u0633\u062a\u0631\u062f\u0647 \u0645\u0642\u0637\u0639\u06cc \u062f\u0631 \u0645\u0648\u0631\u062f \u062a\u0639\u0635\u0628 \u0631\u0648 \u0628\u0647 \u067e\u0627\u06cc\u06cc\u0646 \u062e\u0637\u0627\u0647\u0627\u06cc \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f \u060c \u0627\u06cc\u0646 \u0645\u0634\u06a9\u0644 \u0628\u0647 \u0637\u0648\u0631 \u06af\u0633\u062a\u0631\u062f\u0647 \u062f\u0631 \u0686\u0627\u0631\u0686\u0648\u0628 \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u067e\u0627\u0646\u0644 \u067e\u0648\u0634\u0634 \u062f\u0627\u062f\u0647 \u0646\u0645\u06cc \u0634\u0648\u062f.\u0645\u0627 \u0639\u0648\u0627\u0642\u0628 \u062d\u0636\u0648\u0631 \u0647\u0645\u0632\u0645\u0627\u0646 \u0627\u0646\u062f\u0627\u0632\u0647 \u0646\u0645\u0648\u0646\u0647 \u06a9\u0648\u0686\u06a9 \u060c \u0646\u0627\u0647\u0645\u06af\u0648\u0646\u06cc \u0648 \u0646\u0642\u0627\u0637 \u062f\u0627\u062f\u0647 \u0631\u0627 \u06a9\u0647 \u0645\u0642\u0627\u062f\u06cc\u0631 \u0634\u062f\u06cc\u062f \u062f\u0631 \u0645\u062a\u063a\u06cc\u0631\u0647\u0627 (&#8220;\u0646\u0642\u0627\u0637 \u0627\u0647\u0631\u0645 \u062e\u0648\u0628&#8221;) \u0631\u0627 \u0628\u0631 \u0627\u0633\u062a\u0646\u062a\u0627\u062c \u0622\u0645\u0627\u0631\u06cc \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u060c \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u0645.\u0628\u0627 \u062a\u0645\u0631\u06a9\u0632 \u0628\u0631 \u0631\u0648\u06cc \u0645\u062f\u0644\u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u067e\u0627\u0646\u0644 \u062e\u0637\u06cc \u06cc\u06a9 \u0637\u0631\u0641\u0647 \u060c \u0645\u0627 \u062e\u0635\u0648\u0635\u06cc\u0627\u062a \u0646\u0645\u0648\u0646\u0647 \u0628\u062f\u0648\u0646 \u0639\u0644\u0627\u0645\u062a \u0648 \u0645\u062d\u062f\u0648\u062f \u0627\u0632 \u06cc\u06a9 \u0628\u0627\u062a\u0631\u06cc \u0627\u0632 \u0628\u0631\u0622\u0648\u0631\u062f\u06af\u0631\u0647\u0627\u06cc \u0633\u0627\u0632\u06af\u0627\u0631 \u0628\u0627 \u0646\u0627\u0647\u0645\u06af\u0648\u0646\u06cc \u0631\u0627 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0634\u0628\u06cc\u0647 \u0633\u0627\u0632\u06cc \u0645\u0648\u0646\u062a \u06a9\u0627\u0631\u0644\u0648 \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u0645.\u0645\u0627 \u0647\u0645\u0686\u0646\u06cc\u0646 \u06cc\u06a9 \u0628\u0631\u0622\u0648\u0631\u062f\u06af\u0631 \u062a\u0631\u06a9\u06cc\u0628\u06cc \u0627\u0632 \u0645\u0627\u062a\u0631\u06cc\u0633 \u0648\u0627\u0631\u06cc\u0627\u0646\u0633 \u06a9\u0648\u0627\u0631\u06cc\u0627\u0646\u0633 \u067e\u06cc\u0634\u0646\u0647\u0627\u062f \u0645\u06cc \u06a9\u0646\u06cc\u0645.\u0646\u062a\u0627\u06cc\u062c \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u06a9\u0647 \u062e\u0637\u0627\u0647\u0627\u06cc \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f \u0645\u0639\u0645\u0648\u0644\u06cc \u0647\u0645\u06cc\u0634\u0647 \u062a\u0648\u0633\u0637 \u0628\u0631\u0622\u0648\u0631\u062f\u06af\u0631\u0647\u0627\u06cc \u0645\u062d\u0627\u0641\u0638\u0647 \u06a9\u0627\u0631\u0627\u0646\u0647 \u062a\u0631 \u0627\u0632 \u0648\u0627\u0631\u06cc\u0627\u0646\u0633 \u060c \u0628\u0647 \u0648\u06cc\u0698\u0647 \u062f\u0631 \u0646\u0645\u0648\u0646\u0647 \u0647\u0627\u06cc \u06a9\u0648\u0686\u06a9 \u062d\u0627\u06a9\u0645 \u0627\u0633\u062a.\u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0627\u06cc\u0646 \u060c \u0627\u0646\u0648\u0627\u0639 \u062e\u0637\u0627\u0647\u0627\u06cc \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f HC \u0627\u0632 \u0646\u0638\u0631 \u0627\u0646\u062f\u0627\u0632\u0647 \u0648 \u062a\u0633\u062a \u0647\u0627\u06cc \u0642\u062f\u0631\u062a \u062a\u062d\u062a Homoskedasticity \u0639\u0645\u0644\u06a9\u0631\u062f\u0647\u0627\u06cc \u0628\u0633\u06cc\u0627\u0631 \u062e\u0648\u0628\u06cc \u062f\u0627\u0631\u0646\u062f.<\/p>\n<table class=\"table table-bordered table-primary\">\r\n<tr>\r\n\t<td>\r\n\t\u062a\u0648\u062c\u0647 \u06a9\u0646\u06cc\u062f \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0632\u0628\u0627\u0646 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc \u0627\u0633\u062a.\r\n\t<\/td>\r\n<\/tr>\r\n\t\r\n<tr>\r\n\t<td>\r\n     \u0628\u0631\u0627\u06cc \u0633\u0641\u0627\u0631\u0634 \u062a\u0631\u062c\u0645\u0647 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0628\u0647 \u06cc\u06a9\u06cc \u0627\u0632 \u0631\u0648\u0634 \u0647\u0627\u06cc \u062a\u0645\u0627\u0633\u060c \u067e\u06cc\u0627\u0645\u06a9\u060c \u062a\u0644\u06af\u0631\u0627\u0645 \u0648 \u06cc\u0627 \u0648\u0627\u062a\u0633 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\u0628\u0627\u0634\u062f.\r\n\t\t<\/li>\r\n\t\t<li>\r\n\t\t\u0632\u0645\u0627\u0646 \u062a\u062d\u0648\u06cc\u0644 \u062a\u0631\u062c\u0645\u0647 \u0645\u0642\u0627\u0644\u0647 \u062f\u0631 \u0635\u0648\u0631\u062a \u062f\u0627\u0634\u062a\u0646 \u062a\u0639\u062f\u0627\u062f \u0635\u0641\u062d\u0627\u062a \u0639\u0627\u062f\u06cc \u0628\u06cc\u0646 3 \u062a\u0627 5 \u0631\u0648\u0632 \u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f.\r\n\t\t<\/li>\r\n\t\t\r\n\t\t<li>\r\n\t\t\u06a9\u06cc\u0641\u06cc\u062a \u062a\u0631\u062c\u0645\u0647 \u0628\u0633\u06cc\u0627\u0631 \u0628\u0627\u0644\u0627 \u0645\u06cc \u0628\u0627\u0634\u062f. \u0645\u0642\u0627\u0644\u0647 \u0641\u0642\u0637 \u062a\u0648\u0633\u0637 \u0645\u062a\u0631\u062c\u0645\u06cc\u0646 \u0628\u0627 \u0645\u062f\u0631\u06a9 \u062f\u0627\u0646\u0634\u06af\u0627\u0647\u06cc \u0645\u062a\u0631\u062c\u0645\u06cc \u062a\u0631\u062c\u0645\u0647 \u0645\u06cc\u200c\u0634\u0648\u062f.\r\n\t\t<\/li>\r\n\t\t<li>\r\n\t\t\u06a9\u0644\u06cc\u0647 \u062c\u062f\u0627\u0648\u0644 \u0648 \u0641\u0631\u0645\u0648\u0644 \u0647\u0627 \u0646\u06cc\u0632 \u062f\u0631 \u0641\u0627\u06cc\u0644 \u062a\u062d\u0648\u06cc\u0644\u06cc \u0648\u0631\u062f \u062f\u0631\u062c \u0645\u06cc\u200c\u0634\u0648\u0646\u062f.\r\n\t\t<\/li>\r\n\t<\/td>\r\n\t\r\n\t\r\n<\/tr>\r\n<\/table>\r\n\r\n\r\n\n","protected":false},"excerpt":{"rendered":"<p>\u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc Robust Inference in Panel Data Models: Some Effects of Heteroskedasticity and Leveraged Data in Small Samples 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