Lecture2 Freq. Distribution

Lecture2 Freq. Distribution - Why bother? • Frequency...

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Unformatted text preview: Why bother? • Frequency Distribution (F.D.)- a collection of observations produced by sorting observations into classes and showing their frequency ( ƒ ) of occurrence in each class 1 Why bother? • Unfltered data can oFten contain a prohibitive amount oF inFormation • Condense inFormation into a more manageable/ comprehensible Format • IdentiFy trends 2 Why bother? • Detect outliers • Outlier- extreme scores that may indicate errors, interfere with with further statistical analysis, or be informative in its own right 3 Ungrouped Frequency Distributions • 1) Find highest and lowest numbers in data set 2) Plug in values as high and low points in left column of frequency distribution 3) Fill in left column with ALL POSSIBLE VALUES btw. the two extremes, even those with ƒ = 0 4) Count observations and ¡ll in ƒ column Height ƒ 185 2 184 183 182 181 3 180 1 179 178 1 177 176 2 4 Ungrouped Frequency Distributions 178 176 181 181 176 185 185 180 181 Height ƒ 185 2 184 183 182 181 3 180 1 179 178 1 177 176 2 { n = 9 observations ∑ ƒ = 2 + 3 + 1 + 1 + 2 = 9 5 Weaknesses of...
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This note was uploaded on 01/21/2009 for the course PSYC 60 taught by Professor Ard during the Winter '08 term at UCSD.

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Lecture2 Freq. Distribution - Why bother? • Frequency...

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