data tables… kinds of variables… qualitative vs. quantitative discrete vs. continuous displaying...

Download DATA TABLES… KINDS OF VARIABLES… Qualitative vs. Quantitative Discrete vs. Continuous DISPLAYING a QUALITATIVE VARIABLE MORE about HISTOGRAMS

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  • Slide 1
  • DATA TABLES KINDS OF VARIABLES Qualitative vs. Quantitative Discrete vs. Continuous DISPLAYING a QUALITATIVE VARIABLE MORE about HISTOGRAMS
  • Slide 2
  • DATA TABLE partiespoliticssalarysinger 5mod.800001.5 1liberal350003 3liberal3 2mod.400004 2liberal400000
  • Slide 3
  • DATA TABLE partiespoliticssalarysinger 5mod.800004.5 1liberal350003 3liberal3 2mod.400004 2liberal400000 Rows Columns CASES INDIVIDUALS whatever VARIABLES
  • Slide 4
  • Kinds of Variables QUALITATIVE Nominal Just labels Ordinal Order matters QUANTITATIVE Discrete Only certain values (for example, whole numbers) Continuous Any value is possible (at least in some range)
  • Slide 5
  • DISPLAYING ONE QUALITATIVE VARIABLE Frequency table Bar chart Pie chart
  • Slide 6
  • Frequency table - politics VALUECOUNT Liberal20 Moderate3 Conservative2 TOTAL25
  • Slide 7
  • Frequency table - politics VALUECOUNTPERCENT (of column) Liberal2080 % Moderate312 % Conservative28 % TOTAL25100%
  • Slide 8
  • Frequency table politics (Swarthmore) VALUECOUNTPERCENT (of column) Liberal4664% Moderate2231% Conservative4 6% TOTAL72100%
  • Slide 9
  • Frequency table singing VALUECOUNTPERCENT 11039 % 2623 % 36 428 % 52 TOTAL26100 %
  • Slide 10
  • Frequency table singing VALUECOUNTPERCENT 11039 % 2623 % 36 428 % 52 TOTAL26 101 %
  • Slide 11
  • Frequency table singing VALUECOUNTPERCENT 11038 % 2623 % 36 428 % 52 TOTAL26100 %
  • Slide 12
  • Frequency table singing (Swarthmore) VALUECOUNTPERCENT 11622% 21622% 32332% 41217% 55 7% TOTAL72100%
  • Slide 13
  • Slide 14
  • Slide 15
  • EQUAL-AREA PRINCIPLE Areas are in proportion to data values.
  • Slide 16
  • Salaries (Swarthmore) 6000006000050000600005000030000 50000 30000very small250000 75000300007000060000 700008000012500050000 3500065000500007000080000 200000300004000007250060000 8000040000300001500007500040000 12000040000 2000060000 50000075000300006000045000 40000850003500090000150000 50000100000450003000080000 10000050000100000010000050000
  • Slide 17
  • Salaries - $20,000 bin sizes
  • Slide 18
  • $50,000 bin sizes
  • Slide 19
  • $100000 bin sizes
  • Slide 20
  • Constructing a histogram Define bins All the same size ? Easier if they are, but Boundaries ENDPOINT RULE Make a frequency table for your chosen bins Construct histogram
  • Slide 21
  • Shape of a distribution Symmetrical ? Skew right or left Unimodal Bimodal Multimodal Outliers

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