Student Spotlight: Paul Olszlyn

Meet Paul Olszlyn, Senior Data Scientist at NovoDynamics Paul Olsztyn designs and implements databases at NovoDynamics, a company that creates and deploys large scale data systems for corporations.  As his company responded to customer needs for more predictive analytics by building greater capacity in this…

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May 26: Statistics in Practice

This week we return to Coronavirus data to look at new analyses that use mobile phone data to estimate the effects of social distancing restrictions, a vital question now are we see the world falling into “lockdown recession.”  Speaking of economic matters, our course spotlight…

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Density

As Covid-19 continues to spread, so will research on its behavior.  Models that rely mainly on time-series data will expand to cover relevant other predictors (covariates), and one such predictor will be gregariousness.  How to measure it?  In psychology there is the standard personality trait…

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Tracking Your Wanderings, for the Public Good

A recent development in the modeling of Covid-19 data has been the use of mobile phone location data, now available from Google, to estimate the degree to which social distancing restrictions have been implemented, and the effect they have had.   One interesting analysis comes from…

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May 19: Statistics in Practice

This week we take a look at evolutionary algorithms (it was 150 years ago that Charles Darwin first used the term “evolution” in his writings).  Our course spotlight is: July 17 - Aug 14:  Optimization with Linear Programming See you in class! - Peter Bruce…

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Instructor Spotlight: Wayne Folta

Wayne Folta is a Lead Data Scientist with Elder Research, a leading data science consulting company and the parent of Statistics.com.  Wayne’s current ongoing project involves the extraction, analysis and redaction of text.  For example, a healthcare organization might need to release records, stripped of…

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Parameterized

Parameterized code in computer programs (or visualizations or spreadsheets) is code where the arguments being operated on are defined once as a parameter, at the beginning, so they do not have to be repeatedly explicitly defined in the body of the code.  This allows for…

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Evolutionary Algorithms

It was 150 years ago when Darwin first used the term “evolution” in his writing (in his book The Descent of Man).  Two months ago, in The Normal Share of Paupers, I briefly discussed the unfortunate eugenics baggage that the discipline of statistics inherited from…

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Student Spotlight: Timothy Young

Meet Timothy Young, a Contract Administrator for the County of Los Angeles Timothy recently started the Data Science Analytics Bachelor’s Degree program that Statistics.com offers in conjunction with Thomas Edison State University (TESU) and has already been able to put his learning to work.  At…

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May 12: Statistics in Practice

In this Brief, we dive into the terms “sensitivity” and “specificity” and their relatives.  In our course spotlight, clinical trials is the topic.  Now there’s a site just for the 800+ clinical trials associated with Covid-19 (treatments and vaccines).  Is it time for you to…

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Sensitivity and Specificity

We defined these terms already (see this blog), but how can you remember which is which, so you don’t have to look them up?  If you can remember the order in which to recite them - sensitivity then specificity, it’s easy.  Think “positive and negative”…

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May 5: Statistics in Practice

In this week’s Brief, we look deeper into the question of whether Covid-19 is a senior citizen disease.  Our course spotlight is twofold: Start in May or June:  Mastery in Statistical Modeling (3 courses) June 12 to July 10  Analyzing and Modeling Covid-19 Data See…

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COVID-19: Sensitivity, Specificity, and More

Covid-19 has brought statistical concepts and terms into the news as never before. One confusing tangle is the array of terms surrounding diagnostic test results.  The most basic is accuracy - what percent of test results are correct.  This is not necessarily the most important…

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Decision Stumps

A decision stump is a decision tree with just one decision, leading to two or more leaves. For example, in this decision stump a borrower score of 0.475 or greater leads to a classification of “loan will default” while a borrower score less than 0.475…

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Miasma

As more information arrives about the Coronavirus, researchers point more and more to airborne particles and aerosols as the mechanism of spread. Photographic images of a sneeze, such as this one from Lydia Bourouiba at MIT (source here), have been seen by many. It turns…

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