Blog Archives

How public relations and the media are distorting science

June 24, 2015
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Throughout history, engineers, medical doctors and other applied scientists have helped convert  basic science discoveries into products, public goods and policy that have greatly improved our quality of life. With rare exceptions, it has taken years if not decades to establish these discoveries. And even the exceptions stand on the shoulders of incremental contributions. The researchers that

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Batch effects are everywhere! Deflategate edition

June 9, 2015
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Batch effects are everywhere! Deflategate edition

In my opinion, batch effects are the biggest challenge faced by genomics research, especially in precision medicine. As we point out in this review, they are everywhere among high-throughput experiments. But batch effects are not specific to genomics technology. In fact, in this 1972 paper (paywalled), WJ Youden describes batch effects in the context of measurements made by physicists.

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Is it species or is it batch? They are confounded, so we can’t know

May 20, 2015
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In a 2005 OMICS paper, an analysis of human and mouse gene expression microarray measurements from several tissues led the authors to conclude that "any tissue is more similar to any other human tissue examined than to its corresponding mouse tissue". Note that this was a rather surprising result given how similar tissues are between species.

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Genomics Case Studies Online Courses Start in Two Weeks (4/27)

April 13, 2015
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The last month of the HarvardX Data Analysis for Genomics series start on 4/27. We will cover case studies on RNAseq, Variant calling, ChipSeq and DNA methylation. Faculty includes Shirley Liu, Mike Love, Oliver Hoffman and the HSPH Bioinformatics Core. Although taking the previous courses on the series will help, the four case study courses

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Introduction to Bioconductor HarvardX MOOC starts this Monday March 30

March 24, 2015
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Bioconductor is one of the most widely used open source toolkits for biological high-throughput data. In this four week course, co-taught with Vince Carey and Mike Love, we will introduce you to Bioconductor's general infrastructure and then focus on two specific technologies: next generation sequencing and microarrays. The lectures and assessments will be annotated in

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π day special: How to use Bioconductor to find empirical evidence in support of π being a normal number

March 14, 2015
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π day special: How to use Bioconductor to find empirical evidence in support of π being a normal number

Editor's note: Today 3/14/15 at some point between  9:26:53 and 9:26:54 it was the most π day of them all. Below is a repost from last year.  Happy π day everybody! I wanted to write some simple code (included below) to the test parallelization capabilities of my  new cluster. So, in honor of  π day, I

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Advanced Statistics for the Life Sciences MOOC Launches Today

March 2, 2015
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In this four week course we will teach statistical techniques that are commonly used in the analysis of high-throughput data and their corresponding R implementations. In Week 1 we will explain inference in the context of high-throughput data and introduce the concept of error controlling procedures. We will describe the strengths and weakness of the Bonferroni correction,

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Introduction to Linear Models and Matrix Algebra MOOC starts this Monday Feb 16

February 13, 2015
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Matrix algebra is the language of modern data analysis. We use it to develop and describe statistical and machine learning methods, and to code efficiently in languages such as R, matlab and python. Concepts such as principal component analysis (PCA) are best described with matrix algebra. It is particularly useful to describe linear models. Linear

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Data as an antidote to aggressive overconfidence

January 21, 2015
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A recent NY Times op-ed reminded us of the many biases faced by women at work. A followup op-ed  gave specific recommendations for how to conduct ourselves in meetings. In general, I found these very insightful, but don't necessarily agree with the recommendations that women should "Practice Assertive Body Language".  Instead, we should make an effort to judge

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Gorging ourselves on "free" health care: Harvard’s dilemma

January 20, 2015
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Gorging ourselves on "free" health care: Harvard’s dilemma

Editor's note: This is a guest post by Laura Hatfield. Laura is an Assistant Professor of Health Care Policy at Harvard Medical School, with a specialty in Biostatistics. Her work focuses on understanding trade-offs and relationships among health outcomes. Dr. Hatfield received her BS in genetics from Iowa State University and her PhD in biostatistics from the University

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