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    $\begingroup$ Are you wondering how to get R to give this to you? (You would use ?vcov(model).) Or are you wondering where that comes from / why? $\endgroup$ Commented Mar 30, 2015 at 15:50
  • $\begingroup$ I'm less interested in R tricks, and more interested in how I would calculate the variance myself (but using R as a calculator of sorts). Does that make sense? I want to know how to find the variance of a slope, what formula makes sense, and not so much how can I find the answer using R. $\endgroup$ Commented Mar 30, 2015 at 15:54
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    $\begingroup$ I think the answer you want may be at the linked thread. Please read it. If it isn't what you're want / you still have a question afterwords, come back here & edit your Q to state what you learned & what you still need to know. Then we can provide the information you need w/o just duplicating material elsewhere that already didn't help you. $\endgroup$ Commented Mar 30, 2015 at 16:28