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“Although the field of statistics is rooted in mathematics, and mathematics is exact, the use of statistics to describe complex phenomena is not exact.”
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PRECISION VS ACCURACY
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PRECISION CAN MASK INACCURACY
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Wall Street, 2008
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EMPLOYMENT
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UNIT OF ANALYSIS
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Is globalization making income inequality around the planet better or worse?
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LOOKING AT COUNTRIES
LOOKING AT PEOPLE
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OUTLIERS
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GEORGE W BUSH TAX CUTS
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You can just use both if you want to be forthcoming
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APPLES & ORANGES COMPARISON
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INFLATION AND COMPARABLE UNITS
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NOMINAL FIGURES ARE NOT ADJUSTED FOR INFLATION
Photo by Sharon McCutcheon
REAL FIGURES ARE ADJUSTED FOR INFLATION
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$7.25 FEDERAL MINIMUM WAGE
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NEFARIOUS USES FOR PERCENTAGES
“FROM A LOW BASE” VS A SMALL PERCENTAGE OF A HUGE AMOUNT
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MAKE SURE YOU’RE MEASURING WHAT YOU THINK YOU ARE
HOW TO MAKE THE WORLD A BETTER PLACE
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SCHOOL QUALITY
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WE NEED TO KNOW “VALUE ADDED” BY THE SCHOOL
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SCHOOL QUALITY IN CHICAGO
Photo by Chris Smith/Out of Chicago
EXAMPLE: US SECRETARY OF EDUCATION ROD PAIGE
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EXAMPLE: U.S. News & World Report college rankings
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PRECISION, INPUTS & OUTPUTS
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Mistaken math is rarely the problem. The problem is people taking advantage.
Photo by Johannes W
