POS 3703 Lecture Notes - Lecture 5: External Validity, Internal Validity, Wtss

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14 Oct 2016
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The purpose of research design: resea(cid:396)(cid:272)h desig(cid:374) is the diffe(cid:396)e(cid:374)(cid:272)e (cid:271)et(cid:449)ee(cid:374) politi(cid:272)al jou(cid:396)(cid:374)alis(cid:373) a(cid:374)d politi(cid:272)al s(cid:272)ie(cid:374)(cid:272)e, we desig(cid:374) (cid:396)esea(cid:396)(cid:272)h to test ou(cid:396) theo(cid:396)ies, o(cid:373)ethi(cid:374)g (cid:449)e (cid:272)a(cid:374) (cid:272)o(cid:374)t(cid:396)ol a(cid:374)d get (cid:271)ette(cid:396) at. Three essential elements of causal relationship: correlation- can be positive or negative, time order- cause precedes effects, no other explanation- this is usually the hardest to demonstrate. Terms for describing relationships: di(cid:396)e(cid:272)t- more iv=more dv, i(cid:374)(cid:448)e(cid:396)se- more iv= less dv, li(cid:374)ea(cid:396)- effect of iv on dv stays the same. Any diagonal line is linear: cu(cid:396)(cid:448)ili(cid:374)ea(cid:396)- effect of iv on dv depends on the value of iv. Rules fo(cid:396) etti(cid:374)g up c(cid:396)oss ta(cid:271)ulatio(cid:374: values of iv define column, dv defines rows, calculate % within values of iv (not dv, should total 100% down each column. Interpret by comparing % across columns (on the same row) C(cid:396)oss ta(cid:271)ulatio(cid:374)s (cid:449)ith r: e(cid:448)e(cid:396)al fu(cid:374)(cid:272)tio(cid:374)s, the (cid:454)tp(cid:894)(cid:895) fu(cid:374)(cid:272)tio(cid:374) (cid:449)o(cid:396)ks p(cid:396)ett(cid:455) (cid:449)ell.

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