{"id":28669,"date":"2023-07-18T10:31:35","date_gmt":"2023-07-18T13:31:35","guid":{"rendered":"https:\/\/mindthegraph.com\/blog\/scientific-prediction-copy\/"},"modified":"2023-07-18T10:37:02","modified_gmt":"2023-07-18T13:37:02","slug":"extraneous-variables","status":"publish","type":"post","link":"https:\/\/mindthegraph.com\/blog\/cs\/cizi-promenne\/","title":{"rendered":"Ciz\u00ed prom\u011bnn\u00e9 ve v\u00fdzkumu: Regulace potenci\u00e1ln\u00edch vliv\u016f"},"content":{"rendered":"<p>Kontrola prom\u011bnn\u00fdch je ve v\u011bdeck\u00e9m v\u00fdzkumu nezbytn\u00e1 pro zaji\u0161t\u011bn\u00ed platnosti a spolehlivosti v\u00fdsledk\u016f. I ty nejprecizn\u011bji p\u0159ipraven\u00e9 studie v\u0161ak mohou b\u00fdt ovlivn\u011bny ciz\u00edmi prom\u011bnn\u00fdmi, kter\u00e9 nejsou z\u00e1m\u011brn\u011b manipulov\u00e1ny nebo zohled\u0148ov\u00e1ny, ale p\u0159esto mohou ovlivnit z\u00e1v\u011bry v\u00fdzkumu. Ciz\u00ed prom\u011bnn\u00e9 mohou p\u0159isp\u011bt k nespr\u00e1vn\u00fdm v\u00fdsledk\u016fm, \u0161patn\u00fdm progn\u00f3z\u00e1m a nedostate\u010dn\u00e9 replikovatelnosti v\u00fdzkumu.&nbsp;<\/p>\n\n\n\n<p>V tomto \u010dl\u00e1nku se dozv\u00edte v\u0161echny d\u016fle\u017eit\u00e9 informace o ciz\u00edch prom\u011bnn\u00fdch, pro\u010d jsou d\u016fle\u017eit\u00e9 a s jak\u00fdmi typy se m\u016f\u017eete p\u0159i v\u00fdzkumu setkat.&nbsp;<\/p>\n\n\n\n<h2 id=\"h-what-are-extraneous-variables\">Co jsou ciz\u00ed prom\u011bnn\u00e9?<\/h2>\n\n\n\n<p>Ciz\u00ed prom\u011bnn\u00e1 je takov\u00e1 prom\u011bnn\u00e1, kter\u00e1 nen\u00ed ve v\u011bdeck\u00e9 studii c\u00edlen\u011b manipulov\u00e1na nebo kontrolov\u00e1na, ale p\u0159esto m\u016f\u017ee m\u00edt vliv na z\u00e1v\u011bry studie. Maj\u00ed schopnost zm\u00e1st nebo zkreslit prom\u011bnn\u00e9 a ovlivnit p\u0159edev\u0161\u00edm z\u00e1vislou prom\u011bnnou (prom\u011bnn\u00e9).<\/p>\n\n\n\n<p>To m\u016f\u017ee ohrozit platnost studie a naru\u0161it schopnost vyvozovat na z\u00e1klad\u011b zji\u0161t\u011bn\u00ed odpov\u00eddaj\u00edc\u00ed z\u00e1v\u011bry nebo \u010dinit \u0161irok\u00e1 zobecn\u011bn\u00ed. Aby v\u00fdzkumn\u00edci zajistili spolehlivost a platnost sv\u00fdch zji\u0161t\u011bn\u00ed, mus\u00ed pe\u010dliv\u011b analyzovat a kontrolovat ciz\u00ed prom\u011bnn\u00e9.<\/p>\n\n\n\n<p>Ciz\u00ed prom\u011bnn\u00e9 mohou m\u00edt \u0159adu p\u0159\u00ed\u010din, v\u010detn\u011b rozd\u00edl\u016f mezi \u00fa\u010dastn\u00edky, zm\u011bn v experiment\u00e1ln\u00edm prost\u0159ed\u00ed nebo okolnostech a nekontrolovan\u00fdch vliv\u016f prost\u0159ed\u00ed.&nbsp;<\/p>\n\n\n\n<h2 id=\"h-why-are-extraneous-variables-important\">Pro\u010d jsou ciz\u00ed prom\u011bnn\u00e9 d\u016fle\u017eit\u00e9?<\/h2>\n\n\n\n<p>Ciz\u00ed prom\u011bnn\u00e9 jsou d\u016fle\u017eit\u00e9, proto\u017ee mohou m\u00edt zna\u010dn\u00fd vliv na v\u00fdsledek v\u011bdeck\u00e9ho v\u00fdzkumu t\u00edm, \u017ee p\u0159\u00edpadn\u011b zkresluj\u00ed a ovliv\u0148uj\u00ed z\u00e1vislou prom\u011bnnou (prom\u011bnn\u00e9).&nbsp;<\/p>\n\n\n\n<p>Jak ji\u017e bylo uvedeno, ciz\u00ed prom\u011bnn\u00e9 mohou v\u00e9st k chybn\u00fdm nebo zav\u00e1d\u011bj\u00edc\u00edm v\u00fdsledk\u016fm, pokud nejsou identifikov\u00e1ny a zohledn\u011bny, co\u017e m\u016f\u017ee m\u00edt z\u00e1sadn\u00ed d\u016fsledky pro dal\u0161\u00ed v\u00fdzkum a re\u00e1ln\u00e9 aplikace.<\/p>\n\n\n\n<p>Zkreslen\u00ed mohou zp\u016fsobit ciz\u00ed prom\u011bnn\u00e9, jako nap\u0159.:<\/p>\n\n\n\n<ul>\n<li><strong>Zkreslen\u00ed \u00fabytku:<\/strong> Nast\u00e1v\u00e1, kdy\u017e se \u00fa\u010dastn\u00edci v\u00fdzkumu, kte\u0159\u00ed odch\u00e1zej\u00ed, systematicky li\u0161\u00ed od t\u011bch, kte\u0159\u00ed z\u016fst\u00e1vaj\u00ed;<\/li>\n\n\n\n<li><strong>Nedostate\u010dn\u00e9 kryt\u00ed: <\/strong>Nastane, kdy\u017e ve vzorku nen\u00ed zastoupen ur\u010dit\u00fd druh jedinc\u016f z va\u0161\u00ed populace;<\/li>\n\n\n\n<li><strong>Neodpov\u011bdn\u00ed zkreslen\u00ed:<\/strong> Vyskytuje se, kdy\u017e se ti, kte\u0159\u00ed na pr\u016fzkum neodpov\u011bd\u011bli, v\u00fdznamn\u011b li\u0161\u00ed od t\u011bch, kte\u0159\u00ed odpov\u011bd\u011bli;<\/li>\n\n\n\n<li><a href=\"https:\/\/mindthegraph.com\/blog\/sampling-bias\/\"><strong>Zkreslen\u00ed v\u00fdb\u011bru vzorku<\/strong><\/a><strong>, zn\u00e1m\u00e9 tak\u00e9 jako zkreslen\u00ed p\u0159i zji\u0161\u0165ov\u00e1n\u00ed:<\/strong> Nast\u00e1v\u00e1, kdy\u017e je pravd\u011bpodobnost, \u017ee n\u011bkte\u0159\u00ed \u010dlenov\u00e9 c\u00edlov\u00e9 populace budou zahrnuti, ni\u017e\u0161\u00ed ne\u017e u ostatn\u00edch;<\/li>\n\n\n\n<li><strong>Zkreslen\u00ed p\u0159e\u017eit\u00ed:<\/strong> Doch\u00e1z\u00ed k tomu, \u017ee v\u00fdzkumn\u00edci zji\u0161\u0165uj\u00ed z\u00e1v\u011bry pouze na z\u00e1klad\u011b p\u0159\u00edpad\u016f \u00fasp\u011b\u0161n\u00fdch lid\u00ed, nikoliv na z\u00e1klad\u011b cel\u00e9 skupiny.<\/li>\n<\/ul>\n\n\n\n<p>V\u00fdzkumn\u00edci mohou pomoci zajistit platnost a spolehlivost sv\u00fdch zji\u0161t\u011bn\u00ed spr\u00e1vnou identifikac\u00ed a \u00fapravou ciz\u00edch prom\u011bnn\u00fdch. To zahrnuje sn\u00ed\u017een\u00ed nebo odstran\u011bn\u00ed vlivu ciz\u00edch prom\u011bnn\u00fdch, a to bu\u010f pomoc\u00ed experiment\u00e1ln\u00edho pl\u00e1nu (nap\u0159. n\u00e1hodn\u00fdm v\u00fdb\u011brem, vyrovn\u00e1n\u00edm), nebo statistickou anal\u00fdzou. (nap\u0159. zahrnut\u00edm ciz\u00edch prom\u011bnn\u00fdch jako kovari\u00e1t). V\u00fdzkumn\u00ed pracovn\u00edci tak mohou zv\u00fd\u0161it d\u016fv\u011bru ve v\u00fdsledky studie a poskytnout v\u011bdeck\u00e9 komunit\u011b p\u0159esn\u011bj\u0161\u00ed a hodnotn\u011bj\u0161\u00ed informace.<\/p>\n\n\n\n<h2 id=\"h-what-are-the-types-of-extraneous-variables\">Jak\u00e9 jsou typy ciz\u00edch prom\u011bnn\u00fdch?<\/h2>\n\n\n\n<p>Existuj\u00ed r\u016fzn\u00e9 druhy ciz\u00edch prom\u011bnn\u00fdch, kter\u00e9 mohou ovlivnit v\u00fdsledek v\u011bdeck\u00e9ho v\u00fdzkumu. Toto je n\u011bkolik p\u0159\u00edklad\u016f:<\/p>\n\n\n\n<h3 id=\"h-demand-characteristics-variable\">Prom\u011bnn\u00e1 charakteristika popt\u00e1vky<\/h3>\n\n\n\n<p>Typ ciz\u00ed prom\u011bnn\u00e9, kter\u00e1 vznik\u00e1, kdy\u017e \u00fa\u010dastn\u00edci v\u00fdzkumu zm\u011bn\u00ed sv\u00e9 chov\u00e1n\u00ed nebo reakce v d\u016fsledku sign\u00e1l\u016f nebo o\u010dek\u00e1v\u00e1n\u00ed, kter\u00e9 poskytuje samotn\u00fd experiment. Nap\u0159\u00edklad pokud \u00fa\u010dastn\u00edci c\u00edt\u00ed, \u017ee se od nich o\u010dek\u00e1v\u00e1 ur\u010dit\u00e9 chov\u00e1n\u00ed nebo reakce, mohou sv\u00e9 chov\u00e1n\u00ed odpov\u00eddaj\u00edc\u00edm zp\u016fsobem upravit.<\/p>\n\n\n\n<h3 id=\"h-situational-variables\">Situa\u010dn\u00ed prom\u011bnn\u00e9<\/h3>\n\n\n\n<p>Tyto str\u00e1nky<strong> <\/strong>jsou ciz\u00ed prom\u011bnn\u00e9, kter\u00e9 se vyskytuj\u00ed v d\u016fsledku prvk\u016f experiment\u00e1ln\u00edho prost\u0159ed\u00ed nebo prost\u0159ed\u00ed. Vliv na v\u00fdsledky studie mohou m\u00edt nap\u0159\u00edklad zm\u011bny teploty, osv\u011btlen\u00ed nebo \u00farovn\u011b hluku, stejn\u011b jako p\u0159\u00edtomnost dal\u0161\u00edch osob nebo ru\u0161iv\u00fdch vliv\u016f v okol\u00ed.<\/p>\n\n\n\n<h3 id=\"h-participant-variables\">Prom\u011bnn\u00e9 \u00fa\u010dastn\u00edk\u016f<\/h3>\n\n\n\n<p>Individu\u00e1ln\u00ed rozd\u00edly mezi \u00fa\u010dastn\u00edky, kter\u00e9, pokud nejsou zohledn\u011bny, mohou m\u00edt vliv na v\u00fdsledky v\u00fdzkumu. V \u00favahu lze vz\u00edt demografick\u00e9 charakteristiky, jako je v\u011bk, pohlav\u00ed a etnick\u00fd p\u016fvod, i psychologick\u00e9 charakteristiky, jako jsou osobnostn\u00ed rysy, kognitivn\u00ed schopnosti nebo n\u00e1lada.<\/p>\n\n\n\n<h3 id=\"h-experimenter-variable\">Prom\u011bnn\u00e1 experiment\u00e1tora<\/h3>\n\n\n\n<p>Prom\u011bnn\u00e9 experiment\u00e1tora jsou rozd\u011bleny do dvou kategori\u00ed. Prvn\u00ed je, \u017ee interakce experiment\u00e1tor\u016f s \u00fa\u010dastn\u00edky m\u016f\u017ee ne\u00famysln\u011b ovlivnit jejich chov\u00e1n\u00ed, co\u017e je analogick\u00e9 prom\u011bnn\u00e9 charakteristiky popt\u00e1vky. Druh\u00fdm faktorem je potenci\u00e1ln\u00ed zkreslen\u00ed zp\u016fsoben\u00e9 experiment\u00e1torem p\u0159i m\u011b\u0159en\u00ed, pozorov\u00e1n\u00ed, anal\u00fdze nebo interpretaci, kter\u00e9 m\u016f\u017ee zm\u011bnit v\u00fdsledky studie.<\/p>\n\n\n\n<h3 id=\"h-methodological-variables\">Metodick\u00e9 prom\u011bnn\u00e9<\/h3>\n\n\n\n<p>Odchylky v technice nebo postupech v\u00fdzkumu, jako jsou odchylky v m\u011b\u0159ic\u00edch za\u0159\u00edzen\u00edch nebo metod\u00e1ch sb\u011bru dat, mohou b\u00fdt ciz\u00edmi prom\u011bnn\u00fdmi, kter\u00e9 ovliv\u0148uj\u00ed z\u00e1v\u011bry.<\/p>\n\n\n\n<h3 id=\"h-time-variables\">\u010casov\u00e9 prom\u011bnn\u00e9<\/h3>\n\n\n\n<p>\u010casov\u00e9 prom\u011bnn\u00e9, jako je denn\u00ed doba nebo den v t\u00fddnu, mohou b\u00fdt ciz\u00edmi faktory, kter\u00e9 ovliv\u0148uj\u00ed v\u00fdsledky v\u00fdzkumu.<\/p>\n\n\n\n<h3 id=\"h-task-variables\">Prom\u011bnn\u00e9 \u00falohy<\/h3>\n\n\n\n<p>Charakteristiky \u00fakolu nebo podn\u011btu pou\u017eit\u00e9ho ve studii, jako je jeho obt\u00ed\u017enost nebo zn\u00e1most, mohou b\u00fdt ciz\u00ed prom\u011bnn\u00e9, kter\u00e9 ovliv\u0148uj\u00ed v\u00fdsledky studie.<\/p>\n\n\n\n<h2 id=\"h-how-to-control-extraneous-variables\">Jak kontrolovat ciz\u00ed prom\u011bnn\u00e9?<\/h2>\n\n\n\n<p>Zde je n\u011bkolik jednoduch\u00fdch krok\u016f, kter\u00e9 mohou v\u00fdzkumn\u00ed pracovn\u00edci podniknout, aby kontrolovali nekontrolovateln\u00e9 prom\u011bnn\u00e9:<\/p>\n\n\n\n<h3>1. Identifikace potenci\u00e1ln\u00edch nepot\u0159ebn\u00fdch prom\u011bnn\u00fdch<\/h3>\n\n\n\n<p>V\u00fdzkumn\u00edci by m\u011bli pe\u010dliv\u011b analyzovat v\u0161echny potenci\u00e1ln\u00ed faktory, kter\u00e9 by mohly m\u00edt vliv na v\u00fdsledky studie, a identifikovat ty, kter\u00e9 jsou vedlej\u0161\u00ed.<\/p>\n\n\n\n<h3>2. Zp\u016fsob \u0159\u00edzen\u00ed<\/h3>\n\n\n\n<p>Jakmile identifikujete ciz\u00ed prom\u011bnn\u00e9 ovliv\u0148uj\u00edc\u00ed va\u0161i studii, m\u016f\u017eete zvolit metodu kontroly. Metody jsou spojeny s ur\u010ditou kategori\u00ed prom\u011bnn\u00fdch, co\u017e usnad\u0148uje v\u00fdb\u011br techniky, kterou pou\u017eijete. Mezi kontroln\u00ed metody pat\u0159\u00ed n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<h4 id=\"h-standardized-procedures\">Standardizovan\u00e9 postupy<\/h4>\n\n\n\n<p>Tento p\u0159\u00edstup se t\u00fdk\u00e1 situa\u010dn\u00edch, \u010dasov\u00fdch, \u00fakolov\u00fdch a popt\u00e1vkov\u00fdch prom\u011bnn\u00fdch, kter\u00e9 se objevuj\u00ed v cel\u00e9m n\u00e1vrhu studie. Vytvo\u0159te standardn\u00ed opat\u0159en\u00ed pro konzistentn\u00ed nastaven\u00ed pro v\u0161echny \u00fa\u010dastn\u00edky.<\/p>\n\n\n\n<h4 id=\"h-counterbalancing\">Vyva\u017eov\u00e1n\u00ed<\/h4>\n\n\n\n<p>Tento p\u0159\u00edstup souvis\u00ed s prom\u011bnn\u00fdmi \u00fa\u010dastn\u00edk\u016f, jako je specifick\u00e9 po\u0159ad\u00ed ud\u00e1lost\u00ed ve studii. Abyste to zohlednili, m\u016f\u017eete jedn\u00e9 skupin\u011b \u00fa\u010dastn\u00edk\u016f na\u0159\u00eddit, aby dokon\u010dila ur\u010ditou \u010d\u00e1st, zat\u00edmco jin\u00e1 skupina dokon\u010d\u00ed jinou \u010d\u00e1st.<\/p>\n\n\n\n<h4 id=\"h-random-sampling\">N\u00e1hodn\u00fd v\u00fdb\u011br vzork\u016f<\/h4>\n\n\n\n<p>Tento p\u0159\u00edstup souvis\u00ed s prom\u011bnn\u00fdmi \u00fa\u010dastn\u00edk\u016f a zaji\u0161\u0165uje, \u017ee v\u0161ichni \u00fa\u010dastn\u00edci maj\u00ed stejnou pravd\u011bpodobnost, \u017ee budou vybr\u00e1ni. Nap\u0159\u00edklad p\u0159i rozd\u011blov\u00e1n\u00ed osob do kontroln\u00ed a experiment\u00e1ln\u00ed skupiny m\u016f\u017eete losovat jm\u00e9na n\u00e1hodn\u011b, abyste zajistili, \u017ee ka\u017ed\u00fd jedinec bude m\u00edt stejnou \u0161anci b\u00fdt v obou skupin\u00e1ch.<\/p>\n\n\n\n<h4 id=\"h-masking\">Maskov\u00e1n\u00ed<\/h4>\n\n\n\n<p>Tento p\u0159\u00edstup se zab\u00fdv\u00e1 prom\u011bnn\u00fdmi experiment\u00e1tora. Maskov\u00e1n\u00ed spo\u010d\u00edv\u00e1 v tom, \u017ee experiment prov\u00e1d\u00ed n\u011bkdo, kdo si nen\u00ed v\u011bdom c\u00edle studie.<\/p>\n\n\n\n<h2 id=\"h-the-world-s-largest-scientifically-accurate-illustrations-gallery\">Nejv\u011bt\u0161\u00ed galerie v\u011bdecky p\u0159esn\u00fdch ilustrac\u00ed na sv\u011bt\u011b<\/h2>\n\n\n\n<p><a href=\"https:\/\/mindthegraph.com\" target=\"_blank\" rel=\"noreferrer noopener\">Mind the Graph<\/a> je nejv\u011bt\u0161\u00ed v\u011bdecky p\u0159esn\u00e1 galerie ilustrac\u00ed na sv\u011bt\u011b pln\u00e1 ilustrac\u00ed a graf\u016f z mnoha v\u011bdn\u00edch obor\u016f, jako je biologie, chemie, fyzika a dal\u0161\u00ed. Jednoduch\u00e9 pou\u017eit\u00ed a fantastick\u00fd n\u00e1stroj pro zlep\u0161en\u00ed kvality va\u0161\u00ed pr\u00e1ce!<\/p>\n\n\n\n<div style=\"height:21px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"600\" height=\"394\" src=\"https:\/\/mindthegraph.com\/blog\/wp-content\/uploads\/2022\/12\/3yuqz9n9m78.gif\" alt=\"\" class=\"wp-image-25763\"\/><\/figure><\/div>\n\n\n<div style=\"height:21px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"is-layout-flex wp-block-buttons\">\n<div class=\"wp-block-button aligncenter\"><a class=\"wp-block-button__link has-background wp-element-button\" href=\"https:\/\/mindthegraph.com\/\" style=\"border-radius:50px;background-color:#dc1866\" target=\"_blank\" rel=\"noreferrer noopener\">Za\u010dn\u011bte tvo\u0159it s Mind the Graph<\/a><\/div>\n<\/div>\n\n\n\n<div style=\"height:44px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>","protected":false},"excerpt":{"rendered":"<p>P\u0159e\u010dt\u011bte si o ciz\u00edch prom\u011bnn\u00fdch ve v\u00fdzkumu a zp\u016fsobech jejich kontroly, abyste zv\u00fd\u0161ili intern\u00ed validitu sv\u00e9ho v\u00fdzkumu.<\/p>","protected":false},"author":28,"featured_media":28672,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[959,28],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.9 - 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