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  1. J

    Errors on fit parameters with no errors on data

    Hi all Many, maybe all, statistical packages I know of (R, matlab, root, sas) will allow you to fit data with no associated errors, and give you back fit paramters with errors. How is that possible? Many fit libraries use some form of maximum likelihood, e.g. minimizes chi squared or least...
  2. J

    Significance of two-sample problem/test

    I am self-studying an applied statistics course (reading the curriculum, doing the recommended exercises, doing old projects etc.) and I am now trying to deal with this problem: How significant is a drop from 4039 to 3611 traffic related injuries per year? The process (of being injured due...