kloppenborg.cahttps://www.kloppenborg.ca/Wed, 10 Feb 2021 02:56:48 -0500Basis Values From Censored Datahttps://www.kloppenborg.ca/2021/02/basis-values-censored-data/<p>Earlier, I wrote a post about using a <a href="https://www.kloppenborg.ca/2021/02/likelihood-basis-values/">likelihood-based approach to calculating Basis values</a>. In that post, I hinted that likelihood-based approaches can be useful when dealing with censored&nbsp;data.</p> <p>First of all, what does censoring mean? It means that the value reported is either artificially high or artificially low …</p>Stefan KloppenborgWed, 10 Feb 2021 02:56:48 -0500tag:www.kloppenborg.ca,2021-02-10:/2021/02/basis-values-censored-data/postsComposite MaterialsRStatisticsBasis Values Using a Likelihood Approachhttps://www.kloppenborg.ca/2021/02/likelihood-basis-values/<p>All materials have some variability in their strength: some pieces of a given material are stronger than others. The design standards for civil aircraft mandate that one must account for this material variability. This is done by setting appropriate material allowables such that either <span class="math">\(90\%\)</span> or <span class="math">\(99\%\)</span> of the material …</p>Stefan KloppenborgFri, 05 Feb 2021 01:28:04 -0500tag:www.kloppenborg.ca,2021-02-05:/2021/02/likelihood-basis-values/postsComposite MaterialsRStatisticscmstatr: Composite Material Data Statistics in Rhttps://www.kloppenborg.ca/2020/07/cmstatr/<p>From what I&#8217;ve seen, a lot of the statistical analysis of data from composite material data is done in <span class="caps">MS</span> Excel. There are a number of very good tools for doing this analysis in <span class="caps">MS</span> Excel: <a href="https://www.niar.wichita.edu/agate/Documents/default.htm"><span class="caps">ASAP</span></a>, <a href="http://www.niar.wichita.edu/coe/NCAMP_Documents/Programs/HYTEQ%20Feb%207%20%202011.xls"><span class="caps">HYTEQ</span></a>, <span class="caps">STAT</span>-17, and more recently, <a href="https://www.cmh17.org/RESOURCES/StatisticsSoftware.aspx"><span class="caps">CMH17</span>-<span class="caps">STATS</span></a>. I expect that the …</p>Stefan KloppenborgWed, 22 Jul 2020 14:20:41 -0400tag:www.kloppenborg.ca,2020-07-22:/2020/07/cmstatr/postsReproducibilityEngineeringComposite MaterialsRTracking Issues using Jupyter Notebookshttps://www.kloppenborg.ca/2020/04/tracking-issues/<p>I&#8217;m currently collaborating on a paper. My collaborator and I are writing the paper using LaTeX and we&#8217;re using git to track and share changes to the manuscript. We currently have a shared repository on <a href="https://www.github.com">GitHub</a>.</p> <p>GitHub has a lot of great features for collaborating on software &#8212; after …</p>Stefan KloppenborgMon, 13 Apr 2020 01:38:34 -0400tag:www.kloppenborg.ca,2020-04-13:/2020/04/tracking-issues/postsCollaborationPackage Adequacy for Engineering Calculationshttps://www.kloppenborg.ca/2019/06/adequacy/<p>If you do engineering calculations or analysis using a language like <a href="https://www.r-project.org/">R</a> or <a href="https://www.python.org/">Python</a>, chances are that you&#8217;re going to use some packages. Packages are collections of code that someone else has written that you can use in your code. For example, if you need to solve a system …</p>Stefan KloppenborgSat, 29 Jun 2019 17:11:00 -0400tag:www.kloppenborg.ca,2019-06-29:/2019/06/adequacy/postsReproducibilityEngineeringRPythonPandoc Report Templateshttps://www.kloppenborg.ca/2019/06/pandoc-report-templates/<p>The main benefit of using Notebooks (R Notebooks or Jupyter Notebooks) is that the document is reproducible: the reader knows exactly how the results of the analysis were obtained. I wrote about the use of Notebooks in an <a href="https://www.kloppenborg.ca/2019/02/reproducibility/">earlier&nbsp;post.</a></p> <p>Most organizations have a certain report format: a certain cover …</p>Stefan KloppenborgFri, 21 Jun 2019 01:55:33 -0400tag:www.kloppenborg.ca,2019-06-21:/2019/06/pandoc-report-templates/postsReproducibilityEngineeringRPythonAutomating Software Validation Reportshttps://www.kloppenborg.ca/2019/06/automating-software-validation-reports/<p>I&#8217;ve been working on a Python package to analyze adhesively bonded joints recently. This package will be used to analyze adhesive joints in certain aircraft structure and will be used to substantiate the design of structural repairs, amongst other uses. Because of this, the output of this package needs …</p>Stefan KloppenborgFri, 07 Jun 2019 04:39:42 -0400tag:www.kloppenborg.ca,2019-06-07:/2019/06/automating-software-validation-reports/postsReproducibilityEngineeringReproducibility of Engineering Calculationshttps://www.kloppenborg.ca/2019/02/reproducibility/<p>Reproducibility in engineering work doesn&#8217;t seem to get the attention that it deserves. I can&#8217;t count the number of times that I&#8217;ve read an old engineering report in search of a particular result, only to find that the calculation that lead to that result is only barely …</p>Stefan KloppenborgFri, 08 Feb 2019 11:21:57 -0500tag:www.kloppenborg.ca,2019-02-08:/2019/02/reproducibility/postsReproducibilityEngineeringrde: Now on CRANhttps://www.kloppenborg.ca/2018/07/rde/<p>For the last couple of years, we&#8217;ve been using the statistical programming language <a href="https://www.r-project.org">R</a> when we do statistical analysis or data visualizations at work. We typically deal with <em>small data</em> &mdash; most of the time, our data sets are high-tens or low-hundreds of rows of&nbsp;data.</p> <p>A lot of the …</p>Stefan KloppenborgTue, 10 Jul 2018 02:46:34 -0400tag:www.kloppenborg.ca,2018-07-10:/2018/07/rde/postsRProgrammingReproducibilityWelcome to Kloppenborg.cahttps://www.kloppenborg.ca/2018/06/welcome/<p>Welcome to&nbsp;kloppenborg.ca</p> <p>I plan to use this website as a blog where I discuss topics related to engineering, technology and whatever else I&#8217;m thinking about at the&nbsp;time.</p> <p>If you find any of the posts here interesting, feel free to share them. If you don&#8217;t feel …</p>Stefan KloppenborgSat, 30 Jun 2018 19:29:19 -0400tag:www.kloppenborg.ca,2018-06-30:/2018/06/welcome/posts