ملخص المقالة :
امروزه داشتن آگاهی و شناخت کافی سرمایه‌گذاران از وجود ناهنجاری‌ها همچنین نوع واکنش صنایع موجود در بازار سرمایه، می‌تواند تاثیر عمده‌ای در رونق اقتصادی بازار سرمایه داشته باشد. از این‌رو، هدف این پژوهش بررسی تأثیر ناهنجاری‌های تقویمی بر بازده شاخص شرکت‌های پذیرفته شده در بورس اوراق بهادار تهران در حوزه صنایع خودرو در بازه زمانی سال‌های 1399-1395 است. پژوهش بر پایه روش تحلیل چیرگی تصادفی و با استفاده از تکنیک الکتره که یک روش نوین در تحقیقات مالی می‌باشد، انجام شده است. یافته‌ها نشان می‌دهد سه فرضیه اصلی مبنی بر وجود تفاوت معنادار بین بازدهی شاخص صنایع خودرو در روزهای شنبه تا چهارشنبه، در هفته‌های اول، دوم، سوم و چهارم هر ماه و در ماه‌های فروردین تا اسفند هر سه رد شدند که نشانگر عدم کارایی شرکت‌های صنعت خودرو بورس اوراق بهادار تهران است. همچنین بر‌اساس یافته‌های پژوهش مشخص گردید در بین روزهای هفته، روز شنبه و در بین هفته‌های هر ماه، هفته اول، مناسب‌ترین روز و هفته جهت سرمایه‌گذاری در صنعت خودرو می‌باشد. علاوه بر این، بهترین ماه برای سرمایه‌گذاری در صنعت خودرو اسفندماه و بدترین ماه نیز خردادماه است.
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