[et_pb_section fb_built=”1″ _builder_version=”4.16″ custom_padding=”40px||||false|false” global_colors_info=”{}”][et_pb_row _builder_version=”4.16″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” width=”100%” custom_padding=”0px||0px||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_wc_breadcrumb breadcrumb_home_text=”\u0391\u03c1\u03c7\u03b9\u03ba\u03ae” _builder_version=”4.16″ global_colors_info=”{}”][\/et_pb_wc_breadcrumb][et_pb_wc_cart_notice _builder_version=”4.16″ title_font_size=”14px” background_color=”#009249″ custom_button=”on” button_text_size=”16px” button_text_color=”#ffffff” button_bg_color=”#009249″ button_border_width=”4px” button_border_radius=”25px” body_font_size=”14px” global_colors_info=”{}”][\/et_pb_wc_cart_notice][et_pb_wc_title _builder_version=”4.16″ header_text_align=”center” custom_padding=”||30px||false|false” global_colors_info=”{}”][\/et_pb_wc_title][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.16″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” width=”100%” custom_padding=”0px||||false|false” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.16″ custom_padding=”|5%||5%|false|false” custom_padding_tablet=”|25%||25%|false|false” custom_padding_phone=”” custom_padding_last_edited=”on|phone” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_wc_images _builder_version=”4.16″ global_colors_info=”{}”][\/et_pb_wc_images][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.16″ custom_padding=”||||false|false” custom_padding_tablet=”|5%||5%|false|false” custom_padding_phone=”” custom_padding_last_edited=”on|tablet” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_wc_rating _builder_version=”4.16″ global_colors_info=”{}”][\/et_pb_wc_rating][et_pb_wc_price _builder_version=”4.16″ global_colors_info=”{}”][\/et_pb_wc_price][et_pb_wc_add_to_cart _builder_version=”4.16″ global_colors_info=”{}” dropdown_menus_text_color__hover_enabled=”off|desktop”][\/et_pb_wc_add_to_cart][et_pb_wc_description _builder_version=”4.16″ body_font_size=”14px” global_colors_info=”{}”][\/et_pb_wc_description][et_pb_wc_meta show_sku=”off” show_tags=”off” _builder_version=”4.16″ global_colors_info=”{}”][\/et_pb_wc_meta][et_pb_wc_additional_info module_class=”additional-information-small” _builder_version=”4.16″ global_colors_info=”{}”][\/et_pb_wc_additional_info][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.16″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” width=”100%” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_wc_tabs active_tab_background_color=”#ffffff” inactive_tab_background_color=”#009249″ active_tab_text_color=”#009249″ include_tabs=”description|additional_information|” _builder_version=”4.16″ tab_text_color=”#ffffff” body_font_size=”14px” border_color_all=”#009249″ global_colors_info=”{}”] [\/et_pb_wc_tabs][et_pb_wc_upsells _builder_version=”4.16″ global_colors_info=”{}”][\/et_pb_wc_upsells][et_pb_wc_related_products _builder_version=”4.16″ title_font_size=”22px” global_colors_info=”{}”][\/et_pb_wc_related_products][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"
In the present study, the stochastic time series models are examined and the ARIMA model in forecasting GDP per quarter as well as the seasonal SARIMA model, which proves to be more appropriate of the two models.<\/span><\/p>\n <\/p>","protected":false},"featured_media":6700,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"\u03a3\u03c4\u03bf \u03c0\u03b1\u03c1\u03cc\u03bd \u03b2\u03b9\u03b2\u03bb\u03af\u03bf\u00a0 \u03b5\u03be\u03b5\u03c4\u03ac\u03b6\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c4\u03b1 \u03c3\u03c4\u03bf\u03c7\u03b1\u03c3\u03c4\u03b9\u03ba\u03ac \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03b1 \u03c7\u03c1\u03bf\u03bd\u03bf\u03c3\u03b5\u03b9\u03c1\u03ce\u03bd \u03ba\u03b1\u03b9 \u03b5\u03b9\u03b4\u03b9\u03ba\u03cc\u03c4\u03b5\u03c1\u03b1 \u03c4\u03bf \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03bf ARIMA \u03c3\u03c4\u03b7\u03bd \u03c0\u03c1\u03cc\u03b2\u03bb\u03b5\u03c8\u03b7 \u03c4\u03bf\u03c5 \u0391\u0395\u03a0 \u03b1\u03bd\u03ac \u03c4\u03c1\u03af\u03bc\u03b7\u03bd\u03bf \u03ba\u03b1\u03b8\u03ce\u03c2 \u03ba\u03b1\u03b9 \u03c4\u03bf \u03b5\u03c0\u03bf\u03c7\u03b9\u03ba\u03cc \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03bf SARIMA, \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03b1\u03c0\u03bf\u03b4\u03b5\u03b9\u03ba\u03bd\u03cd\u03b5\u03c4\u03b1\u03b9 \u03ba\u03b1\u03c4\u03b1\u03bb\u03bb\u03b7\u03bb\u03cc\u03c4\u03b5\u03c1\u03bf \u03b1\u03c0\u03cc \u03c4\u03b1 \u03b4\u03cd\u03bf \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03b1. \u0391\u03c1\u03c7\u03b9\u03ba\u03ac, \u03c0\u03b5\u03c1\u03b9\u03b3\u03c1\u03ac\u03c6\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c4\u03b1 \u03b2\u03b1\u03c3\u03b9\u03ba\u03ac \u03c3\u03c4\u03b1\u03c4\u03b9\u03c3\u03c4\u03b9\u03ba\u03ac \u03c7\u03b1\u03c1\u03b1\u03ba\u03c4\u03b7\u03c1\u03b9\u03c3\u03c4\u03b9\u03ba\u03ac \u03c4\u03c9\u03bd \u03c7\u03c1\u03bf\u03bd\u03bf\u03c3\u03b5\u03b9\u03c1\u03ce\u03bd \u03ba\u03b1\u03b9 \u03c3\u03c4\u03b7\u03bd \u03c3\u03c5\u03bd\u03ad\u03c7\u03b5\u03b9\u03b1 \u03b1\u03bd\u03b1\u03bb\u03cd\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c4\u03b1 \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03b1 ARIMA \u03ba\u03b1\u03b9 SARIMA.\u00a0 \u0393\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b2\u03ad\u03bb\u03c4\u03b9\u03c3\u03c4\u03b7 \u03b5\u03c0\u03b9\u03bb\u03bf\u03b3\u03ae \u03c4\u03c9\u03bd \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03c4\u03c1\u03c9\u03bd p,d,q \u03c3\u03c4\u03bf \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03bf ARIMA \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c4\u03b1\u03b9 \u03b7 \u03bc\u03ad\u03b8\u03bf\u03b4\u03bf\u03c2 Box-Jenkins. \u0397 \u03b1\u03be\u03b9\u03bf\u03bb\u03cc\u03b3\u03b7\u03c3\u03b7 \u03c4\u03c9\u03bd \u03c0\u03c1\u03bf\u03b2\u03bb\u03b5\u03c0\u03c4\u03b9\u03ba\u03ce\u03bd \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03c9\u03bd \u03c0\u03c1\u03b1\u03b3\u03bc\u03b1\u03c4\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c4\u03b1\u03b9 \u03c4\u03cc\u03c3\u03bf \u03bc\u03b5 \u03b4\u03b5\u03af\u03ba\u03c4\u03b5\u03c2 Akaike Information Criteria (AIC) \u03ba\u03b1\u03b9 Bayesian Information Criteria (BIC) \u03b3\u03b9\u03b1 \u03c4\u03b1 \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03b1 ARIMA \u03cc\u03c3\u03bf \u03ba\u03b1\u03b9 \u03bc\u03b5 \u03c4\u03bf\u03c5\u03c2 \u03b4\u03b5\u03af\u03ba\u03c4\u03b5\u03c2 Root Mean Square Error (RMSE) \u03ba\u03b1\u03b9 Mean Absolute Error (MAE), \u03ba\u03b1\u03b8\u03ce\u03c2 \u03ba\u03b1\u03b9 \u03bc\u03b5 \u03b1\u03be\u03b9\u03bf\u03bb\u03cc\u03b3\u03b7\u03c3\u03b7 \u03c4\u03c9\u03bd \u03b3\u03c1\u03b1\u03c6\u03b9\u03ba\u03ce\u03bd \u03b1\u03bd\u03b1\u03c0\u03b1\u03c1\u03b1\u03c3\u03c4\u03ac\u03c3\u03b5\u03c9\u03bd \u03c4\u03b7\u03c2 \u03c3\u03c5\u03bd\u03ac\u03c1\u03c4\u03b7\u03c3\u03b7\u03c2 \u03b1\u03c5\u03c4\u03bf\u03c3\u03c5\u03c3\u03c7\u03ad\u03c4\u03b9\u03c3\u03b7\u03c2 Auto Correlation Function (ACF) \u03ba\u03b1\u03b9 \u03bc\u03b5\u03c1\u03b9\u03ba\u03ae\u03c2 \u03b1\u03c5\u03c4\u03bf\u03c3\u03c5\u03c3\u03c7\u03ad\u03c4\u03b9\u03c3\u03b7\u03c2 Partial ACF (PACF). \u03a4\u03ad\u03bb\u03bf\u03c2 \u03b1\u03bd\u03b1\u03bb\u03cd\u03b5\u03c4\u03b1\u03b9 \u03b2\u03ae\u03bc\u03b1 \u03c0\u03c1\u03bf\u03c2 \u03b2\u03ae\u03bc\u03b1 \u03b7 \u03b4\u03b9\u03b1\u03b4\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 \u03c0\u03bf\u03c5 \u03b1\u03ba\u03bf\u03bb\u03bf\u03c5\u03b8\u03ae\u03b8\u03b7\u03ba\u03b5 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03ba\u03b1\u03c4\u03b1\u03c3\u03ba\u03b5\u03c5\u03ae \u03c4\u03c9\u03bd \u03bc\u03bf\u03bd\u03c4\u03ad\u03bb\u03c9\u03bd ARIMA, SARIMA, \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b5\u03ba\u03c4\u03ad\u03bb\u03b5\u03c3\u03b7 \u03c4\u03c9\u03bd \u03c0\u03c1\u03bf\u03b2\u03bb\u03ad\u03c8\u03b5\u03c9\u03bd \u03c3\u03c4\u03b1 \u03b5\u03c0\u03b9\u03bb\u03b5\u03b3\u03bc\u03ad\u03bd\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c4\u03bf\u03c5 \u0391\u0395\u03a0 \u03b1\u03bd\u03ac \u03c4\u03c1\u03af\u03bc\u03b7\u03bd\u03bf.\u00a0<\/span>","_et_gb_content_width":"","wds_primary_product_brand":0,"wds_primary_product_cat":0,"wds_primary_berocket_brand":0},"product_brand":[],"product_cat":[157,46],"product_tag":[],"berocket_brand":[325],"class_list":["post-6698","product","type-product","status-publish","has-post-thumbnail","product_cat-157","product_cat-46","berocket_brand-christos-karnavas","first","instock","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/product\/6698","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/comments?post=6698"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/media\/6700"}],"wp:attachment":[{"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/media?parent=6698"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/product_brand?post=6698"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/product_cat?post=6698"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/product_tag?post=6698"},{"taxonomy":"berocket_brand","embeddable":true,"href":"https:\/\/akakia.net\/en\/wp-json\/wp\/v2\/berocket_brand?post=6698"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}