Lecture4_know your data

Lecture4_know your data - Before you start: Know your data!...

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Unformatted text preview: Before you start: Know your data! Graphical Exploration of Data Graphical Exploration of Data Exploration Analysis Presentation/communication Graphic aids Examining distribution (single variable) His to g ra m s (fre q ue nc y) His to g ra m s ( pro b a b ility de ns ity) Bo xplo ts Q ua ntile -Q ua ntile plo ts S TREAM NO 3 TO N TN NH4 DO C S O 4 C L C A MG H 1 S a nta C ruz 24.2 5.6 29.9 0.8 180.4 50.6 15.5 54.7 14.4 0.48 2 C o lg a te 25.4 4.9 30.3 1.4 108.8 55.4 16.4 58.4 17.0 0.24 3 Ha ls e y 29.7 4.4 33.0 0.8 104.7 56.5 17.1 65.9 19.6 0.47 4 Ba ta via Hill 22.1 6.1 28.3 1.4 84.5 57.5 16.8 59.5 19.5 0.23 5 Windha m Ridg 13.1 5.7 17.6 0.6 82.4 58.3 18.3 54.6 21.9 0.37 6 S ilve r S prin 27.5 3.0 30.8 1.1 86.6 63.0 15.7 68.5 22.4 0.17 Dataset His to g ra m s : fre q ue nc y dis trib utio n His to g ra m s : probability density Histograms: probability density M = median = 3.4 Q 1 = first quartile = 2.2 Q 3 = third quartile = 4.35 1 1 0.6 2 2 1.2 3 3 1.6 4 4 1.91....
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This note was uploaded on 01/12/2012 for the course ENVIRONMET 340 taught by Professor Dr.pan during the Winter '11 term at Portland State.

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Lecture4_know your data - Before you start: Know your data!...

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