Math and Data forBusiness Journalism Students              STEVE DOIG    CRONKITE SCHOOL OF JOURNALISM
Math and data Journalism students are terrified of math and think  Google answers everything. Business coverage demands…...
Computer-assisted Business Reporting Internet browser Spreadsheet: Microsoft Excel Database manager: Microsoft Access?...
Business math Percentage change Compound interest Rates Consumer price index Probability Linear regression Exotica:...
Percentage change Measure change over time NEW / OLD – 1 or (new – old) / old Example: $8 million profit this year, $5...
Compound interest Calculates the effect of interest being added to    principal over time, thus compounding the return  ...
Rates Allows comparisons between places/companies of  different size, or comparisons across time Examples: Accident rate...
Consumer price index Accounts for inflation; lets you compare prices over  time in constant dollars Price_now / cpi_now ...
CPI example: Gasoline prices CPI now = 226.4 CPI in 1965 was 30.8 Gasoline in 1965 was $0.30 per gallon. X / 0.30 = 22...
Probability Most likely use in business journalism would be to  calculate the chances of some event occuring. Also impor...
Linear regression Useful for spotting outliers Compares how one or more independent variables  affect the value of a dep...
Other business statistics tools Herfindahl-Hirschman Index: used to measure  market concentration Gini coefficient: meas...
Business data Web sites your students should know:   Company Web sites for industries they cover.   Secretaries of Stat...
Searching for data Google (use advanced search) Google Finance: www.google.com/finance Bing Wolfram Alpha?
More websites with business data Edgar for SEC filings. http://www.sec.gov The SEC site also contains enforcement data. ...
Still more… Patent and Trademark Office is sometimes useful.  http://www.uspto.gov/ Don’t forget the U.S. International ...
U.S. Census Bureau It’s much more than headcounting – here’s just a little of what business journalists can find at censu...
Census business data index page http://www.census.gov/econ/www/index.html
Foreign trade data For example, from the Census Bureau, downloadable from its Web site:
IRE resources               for business journalists http://www.ire.org/store Computer-Assisted Reporting: A Practical G...
More IRE resources IRE Resource Center: www.ire.org/resourcecenter/ Why reinvent the wheel? More than 2,000 tip sheets ...
More IRE resources The NICAR Database Library at  http://data.nicar.org/ Databases for business journalists:    SEC adm...
Good math resources Innumeracy, by John Allen Paulos A Mathematician Reads the Newspaper, by Paulos Precision Journalis...
Excel and web data demonstrations
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Math and Data for Business Journalism Students by Steve Doig

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Steve Doig presents "Math and Data for Business Journalism Students" during the annual 2012 Reynolds Business Journalism Seminars, hosted by the Donald W. Reynolds National Center for Business Journalism. For more information about free training for business journalists, please visit businessjournalism.org.

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Math and Data for Business Journalism Students by Steve Doig

  1. 1. Math and Data forBusiness Journalism Students STEVE DOIG CRONKITE SCHOOL OF JOURNALISM
  2. 2. Math and data Journalism students are terrified of math and think Google answers everything. Business coverage demands…  Good math skills  Good data analysis skills We need to teach them how to use math to analyze data
  3. 3. Computer-assisted Business Reporting Internet browser Spreadsheet: Microsoft Excel Database manager: Microsoft Access? Statistics: SPSS?
  4. 4. Business math Percentage change Compound interest Rates Consumer price index Probability Linear regression Exotica:  Gini coefficient  H-H index  Benford’s Law
  5. 5. Percentage change Measure change over time NEW / OLD – 1 or (new – old) / old Example: $8 million profit this year, $5 million last year  8/5 - 1 = 1.6 - 1 = .6, or a 60% increase Example: $5 million profit this year, $8 million last year  5/8 – 1 = .625 – 1 = - .375, or a 37.5% decrease
  6. 6. Compound interest Calculates the effect of interest being added to principal over time, thus compounding the return Future_value = present_value * (1 + i)^n i = interest rate n = number of periods (i.e., 360 for 30 year mortgage paid monthly) Many compound interest calculators on the Web:  http://www.webmath.com/compinterest.html
  7. 7. Rates Allows comparisons between places/companies of different size, or comparisons across time Examples: Accident rates, foreclosure rates Example: Jonesville has 50 of 20,000 homes in foreclosure; Metropolis has 5,000 of 2 million in foreclosure  Jonesville: (60 / 20000) * 1000 = 3 homes per 1,000  Metropolis: (4000 / 2000000) * 1000 = 2 homes per 1,000
  8. 8. Consumer price index Accounts for inflation; lets you compare prices over time in constant dollars Price_now / cpi_now = price_then / cpi_then Get CPI from Bureau of Labor Statistics at www.bls.gov/CPI/
  9. 9. CPI example: Gasoline prices CPI now = 226.4 CPI in 1965 was 30.8 Gasoline in 1965 was $0.30 per gallon. X / 0.30 = 226.4 / 30.8 X = (226.4 / 30.8) * 0.30 X = 7.35 * 0.30 = 2.21 Therefore, gas in 1965 cost the equivalent of $2.21 per gallon in today’s dollars.
  10. 10. Probability Most likely use in business journalism would be to calculate the chances of some event occuring. Also important in understanding p-values in research papers. Example: WSJ calculated the chances of executive stock options being granted at the best possible time and used the results to show that dozens of companies were backdating option grants.
  11. 11. Linear regression Useful for spotting outliers Compares how one or more independent variables affect the value of a dependent variable Relationship can be seen in an X-Y scatterplot Time-series regression: Time is X-axis
  12. 12. Other business statistics tools Herfindahl-Hirschman Index: used to measure market concentration Gini coefficient: measures inequality in wealth distribution Benford’s Law: pattern of first digits in a collection of numbers can reveal expense account cheating or other man-made patterns.
  13. 13. Business data Web sites your students should know:  Company Web sites for industries they cover.  Secretaries of State Web sites for incorporation records. http://www.nass.org  Hoovers for company and industry information, (but it’s a pay site). http://www.hoovers.com  Lexis/Nexis. http://www.lexisnexis.com/
  14. 14. Searching for data Google (use advanced search) Google Finance: www.google.com/finance Bing Wolfram Alpha?
  15. 15. More websites with business data Edgar for SEC filings. http://www.sec.gov The SEC site also contains enforcement data. http://www.sec.gov/divisions/enforce.shtml Bureau of Economic Analysis for updated state and regional economy data. http://www.bea.gov The Bureau of Labor Statistics has even more economic statistics. http://www.bls.gov The Federal Reserve has much information about monetary policy and banking. www.federalreserve.gov
  16. 16. Still more… Patent and Trademark Office is sometimes useful. http://www.uspto.gov/ Don’t forget the U.S. International Trade Commission. http://www.usitc.gov/ And the U.S. Census Bureau for demographics. http://www.census.gov
  17. 17. U.S. Census Bureau It’s much more than headcounting – here’s just a little of what business journalists can find at census.gov:  Economic Census – local business data collected every five years.  County business patterns.  Minority- and women-owned business data.  Building permits.  Foreign trade exports by state.
  18. 18. Census business data index page http://www.census.gov/econ/www/index.html
  19. 19. Foreign trade data For example, from the Census Bureau, downloadable from its Web site:
  20. 20. IRE resources for business journalists http://www.ire.org/store Computer-Assisted Reporting: A Practical Guide, by Brant Houston. The Investigative Reporter’s Handbook: A Guide to Documents, Databases and Techniques, by Brant Houston, Len Bruzzese and Steve Weinberg. Numbers in the Newsroom: Using Math and Statistics in the Newsroom by Sarah Cohen. Part of the IRE Beat Book series.
  21. 21. More IRE resources IRE Resource Center: www.ire.org/resourcecenter/ Why reinvent the wheel? More than 2,000 tip sheets from IRE and NICAR conferences, many on covering the business beat and doing investigations. Searchable database of more than 20,000 stories, both print and broadcast.
  22. 22. More IRE resources The NICAR Database Library at http://data.nicar.org/ Databases for business journalists:  SEC administrative proceedings.  Federal contracts data.  Home Mortgage Disclosure Act data.  IRS Exempt Organizations.  SBA business loans and disaster loans.  Federal Audit Clearinghouse Database.  Consumer Product Safety data  OSHA Workplace Safety data  Wage and Hour Enforcement
  23. 23. Good math resources Innumeracy, by John Allen Paulos A Mathematician Reads the Newspaper, by Paulos Precision Journalism (4th ed.), by Phil Meyer Math Tools for Journalists, by Kathleen Woodruff Wickham Cartoon Guide to Statistics, by Larry Gonick Statistics Every Writer Should Know (website), www.robertniles.com/stats/
  24. 24. Excel and web data demonstrations

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