shw4: Simple regression

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    author = {{YOUR NAME}},
    publisher = {Office for Research Development and Education},
    title = {Statistical Computations at FreeStatistics.org, URL http://www.freestatistics.org/blog/date/2009/Oct/23/t1256279362hv0rso9wj6sy08p.htm/},
    year = {2009},
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@Manual{R,
    title = {R: A Language and Environment for Statistical Computing},
    author = {{R Development Core Team}},
    organization = {R Foundation for Statistical Computing},
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    year = {2009},
    note = {{ISBN} 3-900051-07-0},
    url = {http://www.R-project.org},
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