STA6166 F05-3 Graphic Summaries

STA6166 F05-3 - Topic(3 SUMMARIZING DATA TABLES AND GRAPHICS 3-1 Topic(3 SUMMARIZING DATA TABLES AND GRAPHICS A Frequency Distributions For Samples

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Topic (3) SUMMARIZING DATA - TABLES AND GRAPHICS 3-1 Topic (3) SUMMARIZING DATA - TABLES AND GRAPHICS A) Frequency Distributions For Samples Defn: A FREQUENCY DISTRIBUTION is a tabular or graphical display of the frequencies or number of occurrences of the values of a variable in the data set. EXAMPLE A DDT contamination study was done on a portion of the Tennessee River in 1980. The experiment involved sampling five fish at each of several locations along the river. For each fish, the variables measured were: location (miles upstream of the mouth of the river), species, length (centimeters), weight (grams), and DDT concentration in the fillet (ppm). Part of the data set follows. Obs Location Species Length Weight Concentration 1 275 catfish 48.0 986 8.40 2 275 catfish 45.0 1023 15.00 3 275 catfish 49.0 1266 25.00 4 280 catfish 51.0 1398 11.00 5 280 catfish 44.0 917 5.50 6 280 buffalofish 49.0 1763 4.50 7 280 buffalofish 46.0 1459 4.20 8 285 bass 28.5 778 0.48 9 285 bass 26.0 532 1.18 10 285 bass 25.5 441 2.34 11 285 bass 25.0 544 3.11 12 285 catfish 44.0 897 5.80

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Topic (3) SUMMARIZING DATA - TABLES AND GRAPHICS 3-2 1) Summarizing Categorical Data One-way Frequency Table Species Absolute Frequency Relative Frequency Catfish 6 6/12 = 0.5 Buffalofish 2 2/12 = 0.167 Bass 4 4/12 = 0.333 TOTAL 12 1.00 Bar Chart SPECIES catfish buffalofish bass Count 7 6 5 4 3 2 1
Topic (3) SUMMARIZING DATA - TABLES AND GRAPHICS 3-3 2) Summarizing Continuous Data

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This note was uploaded on 11/23/2011 for the course STA 6166 taught by Professor Staff during the Summer '08 term at University of Florida.

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STA6166 F05-3 - Topic(3 SUMMARIZING DATA TABLES AND GRAPHICS 3-1 Topic(3 SUMMARIZING DATA TABLES AND GRAPHICS A Frequency Distributions For Samples

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