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Visualizing Missing Data in R: The Basics with VIM

Posted on May 14, 2020May 20, 2020 by Alex

In this post we describe basic visualization of missing data patterns in R with VIM….

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Stationarity and Non-stationary Time Series with Applications in R

Posted on May 10, 2020May 20, 2020 by Alex

In this post we describe stationary and non-stationary time series. We first ask why we…

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An Introduction to Time Series Smoothing in R

Posted on May 4, 2020May 20, 2020 by Alex

In this post we describe the basics of time series smoothing in R. We first…

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Solving Full Rank Linear Least Squares Without Matrix Inversion in Python and Numpy

Posted on April 26, 2020May 12, 2020 by Alex

In this post we describe how to solve the full rank least squares problem without…

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1-d Convolutional Neural Networks for Time Series: Basic Intuition

Posted on April 14, 2020May 12, 2020 by Alex

In this post we describe the basics of 1-d convolutional neural networks, which can be…

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Feedforward Neural Networks and Multilayer Perceptrons

Posted on April 8, 2020May 12, 2020 by Alex

In this post we describe multilayer perceptrons. We first describe why we want to use…

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The Basics of Missing Data: Assumptions and Settings

Posted on March 22, 2020May 20, 2020 by Alex

In this post we describe the basics of missing data. We first ask whether we…

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The Autoregressive (AR) Model

Posted on March 1, 2020May 20, 2020 by Alex

In this post we describe the autoregressive (AR) time series model. We define it, describe…

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Testing Predictive Value in Time Series: Granger Causality in R

Posted on November 4, 2019September 13, 2020 by Alex

In this post, we describe Granger causality, which helps us answer the question of whether…

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The Basics of Long-Short Term Memory (LSTM)

Posted on October 26, 2019September 4, 2020 by Alex

In this post we describe the basics of long-short term memory (LSTM). We first describe…

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  • hypothesis testing
  • linear and generalized linear models
  • Longitudinal Data Analysis
  • Missing Data
  • Neural Networks+Deep Learning
  • Numerical Linear Algebra
  • optimization
  • Survival
  • Time series
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