Wednesday, November 6, 2013
Sunday, September 22, 2013
Arctic sea ice has *not* recovered, in 7 visuals
Arctic sea ice has *not* recovered, in 7 visuals
“And now it’s global COOLING! Record return of Arctic ice cap as it grows by 60% in a year” shouts the astonishingly misleading headline of a story by the Daily Mail’s David Rose. It is true, that compared to last year, Arctic sea ice has bounced back some from its mind-boggling record low in 2012, 49 percent below the 1979-2000 average.
Friday, March 16, 2012
Political Search Trends: The partisanship behind popular Web queries | The Signal - Yahoo! News
Political Search Trends: The partisanship behind popular Web queries | The Signal - Yahoo! News
Linguistic researchers have gotten very good at teaching computers to recognize a person's political bent when he or she takes to Twitter to spout off about politics. Thanks to their algorithms, we can measure how positive or negative people are about candidates and topics on the microblogging platform without tasking some poor junior staffer with reading 100,000 tweets and categorizing them as mean or nice.
This method of "sentiment analysis" doesn't work for search engine queries, however, since people don't tend to show their cards when looking for information online—they just type in a few keywords about a subject without much clue as to what their opinion about it may be.
Tuesday, October 12, 2010
Highlights of Women’s Earnings in 2008
http://www.bls.gov/cps/cpswom2008.pdf
Their Own Facts | The American Prospect
The first thing that came to your mind when I raised this issue was probably the ideas held by people whose hatred of Barack Obama burns with such an intensity that nothing can disabuse them of the notion that the president is The Other, alien in birth and creed. According to a recent CNN poll, 41 percent of Republicans said Obama was "probably not" or "definitely not" born in the United States; a recent Pew poll found that 31 percent of Republicans believe that Obama is a Muslim, a figure that has gone up, not down, since he has been in office. When Republican officials are asked about these falsehoods, they often smile knowingly, then offer a half-hearted endorsement of the truth, as Mitch McConnell did recently ("The president says he's a Christian. I take him at his word"), leaving all possibilities open.
Monday, June 28, 2010
Errors in census interviews misinterpret racial, ethnic identity - CNN.com
According to a recent report by the U.S. Commerce Department Office of the Inspector General, 71 out of 480 observed census workers failed to follow procedures when conducting face-to-face census gathering. The Census Bureau hired more than 600,000 temporary employees to visit homes and conduct in-person interviews of individuals who did not mail their census forms.
Monday, April 26, 2010
It turns out, people like gays and lesbians more than they like homosexuals:
A recent CBS/New York Times poll reveals how words matter. They asked 500 respondents how they felt about permitting “homosexuals” to serve in the military; then they asked a different 500 how they felt about “gays/lesbians” serving in the military. It turns out, people like gays and lesbians more than they like homosexuals:
Thursday, April 1, 2010
the general format of MLA research papers
This resource, updated to reflect the MLA Handbook for Writers of Research Papers (7th ed.) and the MLA Style Manual and Guide to Scholarly Publishing (3rd ed.), offers examples for the general format of MLA research papers, in-text citations, endnotes/footnotes, and the Works Cited page.
Sunday, March 28, 2010
Iraq War Making Children Shorter, Says Study
The level of violence is higher in the south and center of Iraq and they say in those areas that their estimates show children are on average 0.8cm shorter than their peers growing up elsewhere in the country.
The research used data from three independent surveys conducted before and after 2003 by the central statistics office of Iraq, and exploits the different intensities of the conflict across areas and the age of exposure to the war among children in order to estimate the effect of the war on their health.
Friday, March 26, 2010
Sunday, March 14, 2010
Margin of error
However, the margin of error only accounts for random sampling error, so it is blind to systematic errors that may be introduced by non-response or by interactions between the survey and subjects' memory, motivation, communication and knowledge.
Margin of error
If the exact confidence intervals are used, then the margin of error takes into account both sampling error and non-sampling error. If an approximate confidence interval is used (for example, by assuming the distribution is normal and then modeling the confidence interval accordingly), then the margin of error may only take random sampling error into account. It does not represent other potential sources of error or bias such as a non-representative sample-design, poorly phrased questions, people lying or refusing to respond, the exclusion of people who could not be contacted, or miscounts and miscalculations.
Margin of error
For a simple random sample from a large population, the maximum margin of error is a simple re-expression of the sample size n. The numerators of these equations are rounded to two decimal places.
Margin of error at 99% confidence \approx 1.29/\sqrt{n}\,
Margin of error at 95% confidence \approx 0.98/\sqrt{n}\,
Margin of error at 90% confidence \approx 0.82/\sqrt{n}\,
If an article about a poll does not report the margin of error, but does state that a simple random sample of a certain size was used, the margin of error can be calculated for a desired degree of confidence using one of the above formulae. Also, if the 95% margin of error is given, one can find the 99% margin of error by increasing the reported margin of error by about 30%.
Tuesday, March 9, 2010
Working for Cents on the Dollar: Race and Ethnic Wage Gaps in the Noncollege Labor Market
This paper uses data from the 2007 Survey of Employers in the Low-Skill Labor Market to analyze whether wage differences among workers of different races and ethnicities in the low-skill labor market remain after controlling for individual, job, and employer characteristics. The employer-provided data include detailed information on job requirements and employer characteristics rarely available in household surveys. We find that black workers earn significantly less than white workers in the less-skilled labor market, and a significant difference (12 percent) remains even after controlling for worker, job, and employer characteristics.
The Big Payoff: Educational Attainment and Synthetic Estimates of Work-Life Earnings
The Big Payoff: Educational Attainment and Synthetic Estimates of Work-Life Earnings
The Black-White Gap in Mathematics Course Taking
The Black-White Gap in Mathematics Course Taking Sean Kelly (January 2009)
Wednesday, February 3, 2010
Daily Kos' Poll of Republicans Met With Shock, Skepticism
It's human nature for people to interpret any poll in a way that reinforces what they already believe. And if they can't, they simply dismiss the research as being flawed. Perhaps that is the real takeaway from this survey.
Monday, August 24, 2009
Just 53% Say Capitalism Better Than Socialism - Rasmussen Reports™
It is interesting to compare the new results to an earlier survey in which 70% of Americans prefer a free-market economy. The fact that a “free-market economy” attracts substantially more support than “capitalism” may suggest some skepticism about whether capitalism in the United States today relies on free markets.