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Visualize This

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์ฑ…์„ ํ•œ ๊ถŒ ์ƒ€์Šต๋‹ˆ๋‹ค. “Visualize This“๋ผ๊ณ  ๋ฐ์ดํ„ฐ ์‹œ๊ฐํ™”์— ๋Œ€ํ•œ ์ฑ…์ž…๋‹ˆ๋‹ค. ๋ธ”๋กœ๊ทธ flowingdata.com์„ ์šด์˜ํ•˜๋Š” ์นœ๊ตฌ๊ฐ€ ํŽด๋‚ธ ์ฑ…์ธ๋ฐ ์˜ˆ์ œ๊ฐ€ ๋งŽ์•„์„œ ๋งˆ์Œ์— ๋“ญ๋‹ˆ๋‹ค. ์ผ๋ณธ ์•„๋งˆ์กด์— ์ฃผ๋ฌธํ–ˆ๋”๋‹ˆ ์—ดํ˜ ๋งŒ์— ๋„์ฐฉํ–ˆ๋„ค์š”.

์š”์ฆ˜ ์œ ํ–‰์ธ ๋ฐ์ดํ„ฐ ์‹œ๊ฐํ™”์— ์ €๋„ ๋™์ฐธํ•ด ๋ณด๋ ต๋‹ˆ๋‹ค. ^^;

R์—์„œ SAS์˜ ์˜๊ตฌํŒŒ์ผ sas7bdat ์ด์šฉํ•˜๊ธฐ

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์ตœ๊ทผ R package๊ฐ€ ํ†ต๊ณ„ ๋ถ„์„์— ๋งŽ์ด ์‚ฌ์šฉ๋œ๋‹ค๊ณ ๋Š” ํ•˜์ง€๋งŒ, ๊ธฐ์—…์—์„œ๋Š” SAS๋‚˜ SPSS๋ฅผ ๋” ๋งŽ์ด ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ์œผ๋กœ ์•Œ๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ์ €๋„ ๋Œ€ํ•™์ด๋‚˜ ์—ฐ๊ตฌ๊ธฐ๊ด€์˜ ์˜๋ขฐ์—๋Š” R๋ฅผ ์‚ฌ์šฉํ•˜์ง€๋งŒ, ๊ธฐ์—…์˜ ๋ฐ์ดํ„ฐ ๋ถ„์„์—๋Š” SAS๋ฅผ ์ด์šฉํ•ฉ๋‹ˆ๋‹ค.

๊ฐ„ํ˜น ํด๋ผ์ด์–ธํŠธ๋กœ๋ถ€ํ„ฐ ๋ฐ›์€ ๋ฐ์ดํ„ฐ๊ฐ€ SAS์˜ ์˜๊ตฌ ํŒŒ์ผํ˜•์‹์ธ sas7bdat์ผ ๋•Œ๊ฐ€ ์žˆ์Šต๋‹ˆ๋‹ค. ๋ถ„์„ํ•  ๋•Œ ์•„๋ฌด๋ž˜๋„ ์†์— ์ต์€ R์„ ์„ ํ˜ธํ•˜๊ฒŒ ๋˜๋Š”๋ฐ SAS๋ฅผ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋Š” ํ™˜๊ฒฝ์— ์žˆ์œผ๋ฉด ๋ฐ์ดํ„ฐ๋ฅผ ์ผ๋ฐ˜ ASCII ํŒŒ์ผ๋กœ ๋ณ€ํ™˜ํ•˜์—ฌ ์‚ฌ์šฉํ•˜๋ฉด ๋˜์ง€๋งŒ SAS๋ฅผ ์‚ฌ์šฉํ•  ์ˆ˜ ์—†๋Š” ํ™˜๊ฒฝ์— ์žˆ์„ ๋•Œ๋„ ์žˆ์Šต๋‹ˆ๋‹ค.

๋ฌผ๋ก  R์—์„œ SAS ํ˜•์‹์˜ ๋ฐ์ดํ„ฐ๋ฅผ ๋ถˆ๋Ÿฌ์˜ค๋Š” ํ•จ์ˆ˜ read.ssd()๊ฐ€ ์žˆ๊ธด ํ•˜์ง€๋งŒ, ์ด๋„ ์‹œ์Šคํ…œ์— SAS๊ฐ€ ์„ค์น˜๋˜์–ด ์žˆ์–ด์•ผ๋งŒ ์ด์šฉํ•  ์ˆ˜ ์žˆ์–ด์„œ ์ด๋ž˜์ €๋ž˜ ๋ถˆํŽธํ–ˆ์—ˆ์Šต๋‹ˆ๋‹ค. ๊ทธ๋Ÿฐ๋ฐ ์ตœ๊ทผ sas7bdat๋ผ๋Š” ํŒจํ‚ค์ง€๊ฐ€ ๊ณต๊ฐœ๋˜์–ด ๊ฐ„๋‹จํ•˜๊ฒŒ ์ด ํ˜•์‹์˜ ๋ฐ์ดํ„ฐ๋ฅผ R์— ๋ถˆ๋Ÿฌ์˜ฌ ์ˆ˜ ์žˆ๊ฒŒ ๋˜์—ˆ์Šต๋‹ˆ๋‹ค.
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July 27th, 2011 at 2:43 pm

Posted in R-Tips,SAS

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[R] ์•Œ์•„๋‘๋ฉด ํŽธ๋ฆฌํ•œ ํ•จ์ˆ˜ head์™€ tail

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R์˜ ์‚ฌ์šฉ์ž ํ™˜๊ฒฝ(UI)์€ ๊ทธ๋‹ค์ง€ ์ข‹์€ ํŽธ์ด ๋ชป๋ฉ๋‹ˆ๋‹ค. R์—์„œ ๋ฐ์ดํ„ฐ ํŒŒ์ผ(txt, csv ๋“ฑ)์„ ๋ถˆ๋Ÿฌ์˜ค๋ฉด ๋ฐ์ดํ„ฐํ”„๋ ˆ์ž„ ํ˜•์‹์œผ๋กœ ์ž‘์—…๊ณต๊ฐ„์— ์ €์žฅ๋ฉ๋‹ˆ๋‹ค. ๋ฐ์ดํ„ฐ๊ฐ€ ์ œ๋Œ€๋กœ ์ฝํ˜”๋Š”์ง€ ํ™•์ธํ•˜๋Š” ๋ฐฉ๋ฒ•์€ ์ €์žฅ๋œ ๋ฐ์ดํ„ฐํ”„๋ ˆ์ž„์˜ ์ด๋ฆ„์„ ์ฝ˜์†”์— ์ž…๋ ฅํ•˜๋ฉด ๋ฉ๋‹ˆ๋‹ค๋งŒ ๋ฐ์ดํ„ฐ์˜ ํฌ๊ธฐ๊ฐ€ ํฌ๋ฉด ํ•œ ํ™”๋ฉด์— ๋‹ค ๋ณด์ด์ง€ ์•Š์„๋ฟ๋”๋Ÿฌ, ์ผ์ • ์ˆ˜๊ฐ€ ๋„˜์–ด๊ฐ€๊ฒŒ ๋˜๋ฉด ์•„์˜ˆ ๋ณด์—ฌ ์ฃผ์ง€๋„ ์•Š์Šต๋‹ˆ๋‹ค. ๋˜ํ•œ, ๊ณ„์‚ฐ ๊ฒฐ๊ณผ๊ฐ€ ๋งค์šฐ ๋งŽ์„ ๋•Œ๋„ ๊ฐ™์€ ์ƒํ™ฉ์ด ๋ฐœ์ƒํ•˜๊ฒŒ ๋ฉ๋‹ˆ๋‹ค.
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June 20th, 2011 at 5:34 pm

Posted in R-Tips

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์œ ์ „ํ†ต๊ณ„ํ•™๊ณผ ์ˆ˜๋ฆฌํ†ต๊ณ„ํ•™์˜ ์—ญ์‚ฌ

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์œ ์ „ํ•™๊ณผ ํ†ต๊ณ„ํ•™์€ ์œ ์‚ฌ์ ์ด ๋งŽ์€ ํ•™๋ฌธ์ž…๋‹ˆ๋‹ค. ์‹ค์ œ๋กœ 19์„ธ๊ธฐ ํ›„๋ฐ˜, 20์„ธ๊ธฐ ์ดˆ๋ฐ˜์˜ ์œ ๋ช…ํ•œ ํ†ต๊ณ„ํ•™์ž์ธ Francis Galton, Karl Pearson, R.A Fisher ๋“ฑ์€ ์œ ๋ช…ํ•œ ์œ ์ „ํ•™์ž์ด๊ธฐ๋„ ํ•ฉ๋‹ˆ๋‹ค. ์ด๋ฒˆ ํฌ์ŠคํŠธ์—์„œ๋Š” ๊ฐ๊ฐ์˜ ํ•™๋ฌธ์ด ์–ด๋–ป๊ฒŒ ์‹œ์ž‘๋˜๊ณ , ์–ด๋– ํ•œ ๊ฒฝ๋กœ๋กœ ์ง€๊ธˆ์— ์ด๋ฅด๋ €๋Š”์ง€ ์‚ดํŽด๋ณด๋„๋ก ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค.

์œ ์ „ํ•™์˜ ์„ฑ๋ฆฝ๊ณผ ์—ญ์‚ฌ

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๋‘ ์ด์‚ฐํ˜• ๋ณ€์ˆ˜์˜ ์—ฐ๊ด€์„ฑ ์ฒ™๋„ Cramรฉr’s V

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๋‘ ์ด์‚ฐํ˜• ๋ณ€์ˆ˜์˜ ์—ฐ๊ด€์„ฑ(association)์— ๋Œ€ํ•ด ์•Œ์•„๋ณผ ๋•Œ ํ”ํžˆ ์นด์ด์ œ๊ณฑ ๊ฒ€์ •์„ ์ด์šฉํ•ฉ๋‹ˆ๋‹ค. ํ•˜์ง€๋งŒ, ์—„๋ฐ€ํžˆ ๋งํ•˜๋ฉด ์นด์ด์ œ๊ณฑ ๊ฒ€์ •์€ ์—ฐ๊ด€์„ฑ์˜ ์œ ์˜ํ•œ ์ •๋„(test for the significance)์˜ ๊ฒฐ๊ณผ์ผ ๋ฟ, ์—ฐ๊ด€์„ฑ ํฌ๊ธฐ๋ฅผ ๋‚˜ํƒ€๋‚ด๋Š” ์ฒ™๋„๋Š” ์•„๋‹™๋‹ˆ๋‹ค. ์ฆ‰, ๋‘ ๊ฐœ์˜ ๋ฐ์ดํ„ฐ ์…‹์— ๋Œ€ํ•ด ๊ฐ๊ฐ ์—ฐ๊ด€์„ฑ ๊ฒ€์ •์„ ํ–ˆ์„ ๋•Œ ๊ฒ€์ •๊ฒฐ๊ณผ์ธ ์œ ์˜ํ™•๋ฅ ์„ ๊ฐ€์ง€๊ณ  ์–ด๋А ์ชฝ์ด ์—ฐ๊ด€์„ฑ์ด ํฌ๋‹ค๊ณ ๋Š” ๋งํ•  ์ˆ˜ ์—†๋‹ค๋Š” ๊ฒƒ์ด์ฃ .

๋‘ ์ด์‚ฐํ˜• ๋ณ€์ˆ˜์˜ ์—ฐ๊ด€์„ฑ์˜ ํฌ๊ธฐ๋ฅผ ๋‚˜ํƒ€๋‚ด๋Š” ์ฒ™๋„ ์ค‘ ํ•˜๋‚˜๊ฐ€ Cramรฉr’s V๋ผ๋Š” ๊ฒƒ์ด ์žˆ์Šต๋‹ˆ๋‹ค. Read the rest of this entry »

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June 7th, 2011 at 11:21 am