penn state david passmore wfed r programming pennsylvania state university wfed 540 workforce education and development passmore input-output analysis graph theory ucwhre university of north texas performance improvement social networks pennstate economy simulation policy economics social network analysis network theory offshoring jobs machine learning ai validity wfed540 wf ed shring team science collaboration data science davidpassmore ggplot2 r markdown robert game leontief immigration t.test rstudio r statistics
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