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Åë°èR¸é Àç¹Õ¾î ½Ã¸®Áî3. ±â¼úÅë°è(Descriptive Statistics)


Åë°èR¸é Àç¹Õ¾î ½Ã¸®Áî3. ±â¼úÅë°è(Descriptive Statistics)

Åë°èR¸é Àç¹Õ¾î ½Ã¸®Áî3. ±â¼úÅë°è(Descriptive Statistics)

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¶ÇÇÑ ±â¼úÅë°èºÐ¼®Àº ´Ù¾çÇÑ Åë°èºÐ¼®ÀÇ ±âº»ÀÌ µÇ´Âµ¥, Åë°èÀû Ãß·Ð(statistical inference), ȸ±ÍºÐ¼®(regression analysis), ºóµµºÐ¼®(frequency analysis), »ó°üºÐ¼®(Correlation analysis) µî¿¡ ±â¹ÝºÐ¼®À¸·Î¼­ È°¿ëµÈ´Ù.
µû¶ó¼­ Åë°èÀÇ ±âº»±â¸¦ ´ÙÁö°íÀÚ ÇÑ´Ù¸é ±â¼úÅë°è·®À» °øºÎÇÏ¸é µÈ´Ù. ƯÈ÷ ¼öÄ¡°¡ ÀÚÁÖ µîÀåÇÏ´Â ¹ÌÆÃÀ» Çϰųª, ºÐ¼® ÇÁ·ÎÁ§Æ®¿¡ Âü¿©Çϰųª, ȤÀº ÇкÎ(ȤÀº ´ëÇпø»ý)ÀÌ ±³¼ö´ÔÀÌ ÁֽŠ°úÁ¦¼öÇà ¹× ³í¹®ÁýÇÊÀ» ÇÏ´Â °æ¿ì¿¡´Â ¹Ýµå½Ã ±â¼úÅë°è·®À» ¾Ë¾Æ¾ß ÇÑ´Ù.
±â½¢Åë°è·®À» ¿Ïº®È÷ °øºÎÇصθé Åë°è¿¡ ´ëÇÑ µÎ·Á¿òÀÌ »ç¶óÁö´Â ¸¶¹ýÀ» °æÇèÇÒ ¼ö ÀÖ´Ù.

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¥°. ±â¼úÅë°è
1. ±â¼úÅë°èÇÐÀÇ Á¤ÀÇ
2. ±â¼úÅë°è·®ÀÇ Á¤ÀÇ
¥±. ±â¼úÅë°è·®ÀÇ ÃÑ 4°¡Áö ºÐ·ù
1. Áß½ÉÀ§Ä¡¿¡ ´ëÇÑ Ãøµµ
¨ç »ê¼úÆò±Õ(arithmetic mean; AM)
¨è Áß¾Ó°ª(median),
¨é Àý»çÆò±Õ(trimmed mean)
¨ê °¡ÁßÆò±Õ(Weighted mean),
¨ë ÃÖºó°ª(mode)
¨ì ±âÇÏÆò±Õ(geometric mean; GM)
2. »êÆ÷¿¡ ´ëÇÑ Ãøµµ
¨ç ÃÖ´ñ°ª(Maximum, max), ¨è ÃÖ¼Ú°ª(Minimum, min)
¨é ¸ðºÐ»ê(Population Variance), ¸ðÇ¥ÁØÆíÂ÷(Population Standard deviation)
¨ê Ç¥º»ºÐ»ê(Sample Variance), Ç¥º»Ç¥ÁØÆíÂ÷(Sample Standard deviation)
¨ë Ç¥ÁØ¿ÀÂ÷(Standard Error)
¨ì º¯µ¿°è¼ö(Coefficient of variation, CV)
¨í ¹üÀ§(Range)
¨î »çºÐÀ§¼ö¹üÀ§(Interquartile range, IQR)
3. »ó´ëÀû À§Ä¡¿¡ ´ëÇÑ Ãøµµ
¨ç ¹éºÐÀ§¼ö(percentiles)
¨è ZÁ¡¼ö(Z score) & TÁ¡¼ö(T score)
4. ºÐÆ÷ÀÇ ÇüŸ¦ ³ªÅ¸³»´Â Ãøµµ
¨ç ¿Öµµ(skewness), ¨è ÷µµ(kurtosis)
¥². ±â¼úÅë°è·® [È°¿ëÆí1]
1. iris dataset ¼Ò°³
2. iris datasetÀ» È°¿ëÇÑ ±â¼úÅë°è·® »êÃâ
?summary, describe, summaryBy, describeBy, aggregate function ÀÌ¿ë
3. iris datasetÀ» È°¿ëÇÑ ´Ù¾çÇÑ table function ½Ç½À
?table, prop.table, margin.table, addmargins, CrossTable function ÀÌ¿ë
4. iris datasetÀ» È°¿ëÇÑ ½Ã°¢È­(Visualization)
¥³. ±â¼úÅë°è·® [È°¿ëÆí2]
1. Cars93 dataset ¼Ò°³
2. Cars93 datasetÀ» È°¿ëÇÑ ´Ù¾çÇÑ table function ½Ç½À
?table, prop.table, margin.table, addmargins, CrossTable function ÀÌ¿ë
3. º¸°í¼­¿ë ±â¼úÅë°è·® Å×ÀÌºí »ý¼º
?CreateTableOne, table1 function ÀÌ¿ë
¥´. ºÎ·Ï
1. ±â¼úÅë°è¿Í °ü·ÃµÈ R functions one-pageÁ¤¸®
2. R code Answer
3. ôµµ(scale)¿¡ °üÇÏ¿©
4. Á¤±ÔºÐÆ÷¿Í °ü·ÃµÈ RÀÇ functionµé¿¡ °üÇÏ¿©