Posts Tagged ‘ sapply() ’

Example 9.21: The birthday "problem" re-examined

February 23, 2012
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Example 9.21: The birthday "problem" re-examined

The so-called birthday paradox or birthday problem is simply the counter-intutitive discovery that the probability of (at least) two people in a group sharing a birthday goes up surprisingly fast as the group size increases. If the group is only 23 peo...

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Example 8.26: reading data with variable number of words in a field

February 22, 2011
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Example 8.26: reading data with variable number of words in a field

A student came with a question about how to snag data from a PDF report for analysis. Once she'd copied things her text file looked like:1 Las Vegas, NV --- 53.3 --- --- 12 Sacramento, CA --- 42.3 --- --- 23 Miami, FL --- 41.8 --- --- 34 Tucson, AZ --...

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Example 8.18: A Monte Carlo experiment

December 13, 2010
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Example 8.18: A Monte Carlo experiment

In recent weeks, we've explored methods to fit logistic regression models when a state of quasi-complete separation exists. We considered Firth's penalized likelihood approach, exact logistic regression, and Bayesian models using Markov chain Monte Ca...

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Formatting Decimals in Texts with R

August 30, 2009
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Formatting Decimals in Texts with R

anping Chen raised a question in the Chinese COS forum on the output of Eviews: how to (re)format the decimal coefficients in equations as text output? For example, we want to round the numbers in CC = 16.5547557654 + 0.0173022117998*PP + 0.216234040485 * PP(-1) + 0.810182697599 * (WP + WG) to the 3rd decimal places.

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