ããŒã¿å¯èŠåãŸãšã
Data Visualization.
ããŒã¿å¯èŠåã®ç®çã¯èªåã®ããã®åæãš, ä»è ã«èª¬æããããã®å¯èŠåããã.
åè«
- ðæ¢çŽ¢çããŒã¿è§£æ(EDA)
- ðããžãã¹ã€ã³ããªãžã§ã³ã¹(BI)
- ðãã¬ãŒãããŒã¿å¯èŠå
ðæ¢çŽ¢çããŒã¿è§£æ(EDA)
Exploratory Data Analysis. æªç¥ã®é¢ä¿æ§ãèŠã€ããããšãç®ç.
å¯èŠåããããšã§é¢ä¿æ§ãèŠã€ãã.
- To understand data properties
- To find patterns in data
- To suggest modeling strategies
- To âdebugâ analyses
åºæ¬çãªææ³
- Five-number summary
- Histograms
- Density plot (Scatter Plot)
- Boxplots (for Numerical Data, ãã²)
- Barplot (for categorical Data)
çµ±èšéå¯èŠå
ðèŠçŽçµ±èšéããŸãšãŸãã®ããããŒã¿ã»ããã«ããŠãªã¹ãã§è¡šç€ºããã, ããŒãã«ã§è¡šç€ºããããã.
ðäºæ°èŠçŽ
Five number summary.
ããŒã¿ã®ã°ãã€ãã®æ§åãããããã®ã«ååäœæ°ã®5ã€ã®çµ±èšéãçšããŠè¡šãããš. 5ã€ã®ååäœæ°ãã²ãšã€ã«ãŸãšããããŒã¿ã»ãã.
- æå°å€: 第0ååäœæ°
- Q1: 第 1 ååäœæ°
- äžå€®å€: 第 2 ååäœæ°
- Q3: 第 3 ååäœæ°
- æ倧å€: 第 4ååäœæ°
ãããèŠèŠåããã®ãðç®±ã²ãå³.
ð床æ°ååžè¡š
æšæ¬ã®æŽçæ¹æ³ã®äžã€, Frequency Destribution, Frequency Tables
床æ°: frequency
ããŒã¿ã®å€ãxnilã§è¡šããšã, xãçŸããåæ°. ãã¹ãŠã®åºŠæ°ã«å¯Ÿããããããã®åºŠæ°ãæ¯çã§çŸãããã®ãçžå¯ŸåºŠæ° (Relative Frequencies) ãšãã.
æ¯èŒç³»å¯èŠå: å ±é軞ã§ïŒã€ä»¥äžã®å€ãæ¯ã¹ã
å ±é軞ã§2ã€ä»¥äžã®å€ãæ¯ã¹ãã°ã©ã. æ¯èŒè»žããšãã«å€§äºã«ãªã.
ðæ£ã°ã©ã
ãããããããæ£ã§é ç®ã®å€ã瀺ãã°ã©ã.
äžæ¬äžæ¬ã®æ£ã¯ç¬ç«ããŠããŠ, ã«ããŽãªã«ã«å€æ°ãçŸãå Žåã«å©çšããã.
ðãã¹ãã°ã©ã
ð床æ°ååžè¡šãé·æ¹åœ¢ã®æ±ã§çŸãããã®ããã¹ãã°ã©ã (histogram) ãšãã.
ãã°ãã°æ£ã°ã©ããšåºå¥ããŠæ±ã°ã©ã, æ±ç¶ã°ã©ããšãã.
å šäœã®ããŒã¿ã®ã°ãã€ã(ååž)ãå èš³ãã¿ãããã«äœ¿ããã. é£ç¶çãªã¹ã±ãŒã«ã§ããŒã¿ãæ±ã.
âæ£ã°ã©ããšãã¹ãã°ã©ã ã®éãã¯?
æ£ã°ã©ãã¯ç¬ç«ããããŒã¿ã衚瀺ãã. ãã¹ãã°ã©ã ã¯é£ç¶ããããŒã¿ã®ã°ãã€ããã¿ã.
èŠãç®ãåãã ãã»ãã¯å šéšéã.
ðç®±ã²ãå³: Box Plot
ããã¯ã¹ããããå³, Box And Wisker.
ã°ãã€ãã®ããããŒã¿ãããããããè¡šçŸããããã®çµ±èšåŠçã°ã©ã.
äºæ°èŠçŽ: five-number summaryã®èŠèŠå.
é·æ¹åœ¢ã®ç®±ãšãã®äž¡ç«¯ãã䌞ã³ãã²ãã§è¡šçŸããã.
èŠçŽçµ±èšéãšå ã®ããŒã¿ã®ååžã®äž¡æ¹ãè¡šãããšãã§ã,æ£ã°ã©ãããæ å ±éãå€ã.
ç®±ã²ãå³ã¯ç°ãªãè€æ°ã®ããŒã¿ã®ã°ãã€ããæ¯èŒããäºãã§ãã.
ðæ£åžå³: Scatter Plot
æ§æç³»å¯èŠå: å šäœãšéšåãæ¯èŒ
å šäœãšéšåãæ¯èŒããã°ã©ã.
ðåã°ã©ã: Pie Graph
å€åç³»å¯èŠå: æç³»åã®æ¯èŒ
æç³»åã®æ¯èŒãããã°ã©ã.
ðæãç·ã°ã©ã: Line Chart/Dot Plot
å®éçå€æ°ãçŸãå Žåã«å©çšããã.
EDAããŒã«ãŸãšã
ðBIããŒã«ãž.
ããŒã¿å¯èŠåTopics
ð¡åæãšã¯æ¯ã¹ãããš: å®éåæã®3ã€ã®å
ðã€ã·ã¥ãŒããã¯ããã - å®å® å人ãã.
åæãšã¯, æ¯èŒããããš. ãããŠæ¯èŒã®è»žãåæã«å€§äºã«ãªã.
ç¹ã«å®éåæã«ãããŠå€§äºãªåã¯3ã€. ããããªåæææ³ããã®ïŒã€ã®ã©ããã«åé¡å¯èœ.
- æ¯èŒ: å
±é軞ã§ïŒã€ä»¥äžã®å€ãæ¯ã¹ãããš
- ãã¹ãã°ã©ã
- ååžå³
- ããŒ
- ã³ã©ã
- æ§æ: å
šäœãšéšåãæ¯èŒããããš
- ãã€
- ã¹ã¿ãã¯
- ãŠã©ãŒã¿ãŒãã©ãŒã«
- ãã«ãã¢ãã
- å€å: æç³»åã®æ¯èŒãããããš
- ã©ã€ã³
- ã³ã©ã
- ã¬ã³ãž
â Chart/Plot/Graphã®éãã¯?
èšèãããããããããã«æãã®ã§æŽçããã.