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疫学・統計セミナー:効果と関連
Shuntaro Sato
December 30, 2019
Science
0
1.7k
疫学・統計セミナー:効果と関連
今回は「効果」の定義をし,「関連」との違いを説明します.そして交絡の考え方を導入します.疫学を勉強をする上で,非常に重要なテーマです.
Shuntaro Sato
December 30, 2019
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Transcript
1 ޮՌͱؔ࿈ $IVOUBSP !4IVOUBSPPP Ӹֶɾ౷ܭηϛφʔ ޮՌͱؔ࿈ ࣄ࣮ ަབྷ ަབྷҼࢠ
ޮՌͱؔ࿈ 2
ޮՌͷఆٛʢݸਓϨϕϧʣ 3 ݪҼ ༀΛҿΉ ݁Ռ ࣌ؒޙͷମԹ ˆ ˆ ˆ ࣄ࣮
ༀΛҿΉ ࣄ࣮ ༀΛҿ·ͳ͍ ಉҰରऀʹର͢ΔҟͳΔঢ়گʢമ࿐ɾॲஔɾհೖʣͰͷ݁Ռͷൺֱ ޮՌʢ&⒎FDUʣ ࣄ࣮ − ࣄ࣮ = 36.5 − 39.0 = − 2.5 w ҼՌޮՌʢ$BVTBM&⒎FDUʣͱ͍͏ w ݸମϨϕϧͰͷҼՌޮՌʢ$BVTBMF⒎FDUGPSBOJOEJWJEVBMʣͱ ͍͏
ޮՌͷఆٛʢूஂϨϕϧʣ 4 ݪҼ ༀΛҿΉ ݁Ռ ࣌ؒޙͷମԹ ˆ ฏۉɿˆ ࣄ࣮ ༀΛҿΉ
ࣄ࣮ ༀΛҿ·ͳ͍ ಉҰूஂʹର͢ΔҟͳΔঢ়گʢമ࿐ɾॲஔɾհೖʣͰͷ݁Ռͷൺֱ ޮՌʢ&⒎FDUʣ ࣄ࣮ − ࣄ࣮ = 36.5 − 39.0 = − 2.5 w ฏۉҼՌޮՌʢ"WFSBHFDBVTBMF⒎FDUʣͱ͍͏ w ӸֶͰݟ͍ͨͷίϨʂ ฏۉɿˆ
ޮՌͱؔ࿈ 5 ݚڀରूஂ മ࿐ ඇമ࿐ / / ޮՌ &⒎FDU ؔ࿈
"TTPDJBUJPO ͭͷूஂͷ ࣬පൃੜͷҧ͍ޮՌ ͭͷूஂͷ ࣬පൃੜͷҧ͍ؔ࿈
ަབྷʢ$POGPVOEJOHʣ 6 ޮՌ &⒎FDU ؔ࿈ "TTPDJBUJPO ͭͷूஂͷ ࣬පൃੜͷҧ͍ޮՌ ͭͷूஂͷ ࣬පൃੜͷҧ͍ؔ࿈
ؔ࿈ͱޮՌͷ͕ࠩަབྷʢ$POGPVOEJOHʣ ަབྷΛੜΈग़͢ཁҼΛަབྷҼࢠʢ$POGPVOEFSʣͱ͍͏
લޙൺֱࣄ࣮ͷସʹͳΒͳ͍ 7 w ͋Δूஂͷമ࿐ʢհೖʣલޙΛൺֱ͢Δ w ͭͷूஂͷ࣬පൃੜΛൺֱ͢Δ͔ΒɼޮՌʹͳΔʁ ͳΒͳ͍ɼؔ࿈Ͱ͋Δ !5PPUTJF3PMM͞Μͷ.PEFSO&QJEFNJPMPHZಡॻձࢿྉΛࢀߟ ൃੜ 5JNF
മ࿐ മ࿐ͳ͠ʁ മ࿐ޙ മ࿐͕ͳ͍߹ɼ ൃੜ͕มԽ͠ͳ͍ͱݶΒͳ͍ 1SF
5BLF)PNFNFTTBHF 8 w ޮՌͱؔ࿈ҧ͏ w ޮՌࣄ࣮Λ༻͍ͯఆٛ͢Δ w ޮՌͱؔ࿈ͱͷҧ͍͕ަབྷ w ަབྷΛੜΈग़͢ཁҼ͕ɼަབྷҼࢠͰ͋Δ
ࢀߟจݙ 3PUINBO ,+ (SFFOMBOE 4 -BTI 5- .PEFSOFQJEFNJPMPHZ
7PM 1IJMBEFMQIJB8PMUFST,MVXFS)FBMUI-JQQJODPUU8JMMJBNT8JMLJOT w Ӹֶʹ͍ͭͯ·ͱ·͍ͬͯΔɽҼՌਪʹॏ৺Λஔ͘ςΩετɽղɽ 3PUINBO ,+ ϩεϚϯͷӸֶՊֶతࢥߟͷ༠ࣰ͍ݪग़൛ࣾ w ΑΓ؆୯ͳ༰ +PIO .- "EJDUJPOBSZPGFQJEFNJPMPHZ0YGPSE6OJWFSTJUZ1SFTT w ࣙॻ͔ͩΒͦ͜ɼͱͯಡΈ͍͢ӳޠͰӸֶ༻ޠΛઆ໌͍ͯ͠Δ ୮ޙढ़࿕ দҪໜ೭ ৽൛ҩֶ౷ܭֶϋϯυϒοΫேॻళ ୮ޙढ़࿕ খఃଇ ҩֶ౷ܭֶͷࣄయேॻళ 9
10 :PVUVCFSʹͳΓ·ͨ͠ $IVOUBSPͷ౷ܭɾӸֶνϟϯωϧ IUUQTXXXZPVUVCFDPNDIBOOFM 6$L8+QMZ4JLF4E.5M$G$L,+2