 Machine Learning

26 Great Articles and Tutorials about Regression Analysis. Twitter. Complete guide to create a Time Series Forecast (with Codes in Python) Time Series (referred as TS from now) is considered to be one of the less known skills in the analytics space (Even I had little clue about it a couple of days back). But as you know our inaugural Mini Hackathon is based on it, I set myself on a journey to learn the basic steps for solving a Time Series problem and here I am sharing the same with you. These will definitely help you get a decent model in our hackathon today. Before going through this article, I highly recommend reading A Complete Tutorial on Time Series Modeling in R, which is like a prequel to this article. It focuses on fundamental concepts and is based on R and I will focus on using these concepts in solving a problem end-to-end along with codes in Python. Many resources exist for TS in R but very few are there for Python so I’ll be using Python in this article. Out journey would go through the following steps: What makes Time Series Special? It is time dependent. Let’s understand the arguments one by one: data.index #1. Lesson1. DataOrigami. 12 Algorithms Every Data Scientist Should Know.

Anomaly Detection

Deep Learning. Bayesian - Estimating the covariance posterior distribution of a multivariate gaussian. PAC. F Distribution. Machine Learning in 7 Pictures. Basic machine learning concepts of Bias vs Variance Tradeoff, Avoiding overfitting, Bayesian inference and Occam razor, Feature combination, Non-linear basis functions, and more - explained via pictures. By Deniz Yuret, Feb 2014. I find myself coming back to the same few pictures when explaining basic machine learning concepts. Occam’s Razor and PAC-learning. So far our discussion of learning theory has been seeing the definition of PAC-learning, tinkering with it, and seeing simple examples of learnable concept classes. We’ve said that our real interest is in proving big theorems about what big classes of problems can and can’t be learned. One major tool for doing this with PAC is the concept of VC-dimension, but to set the stage we’re going to prove a simpler theorem that gives a nice picture of PAC-learning when your hypothesis class is small. In short, the theorem we’ll prove says that if you have a finite set of hypotheses to work with, and you can always find a hypothesis that’s consistent with the data you’ve seen, then you can learn efficiently.

It’s obvious, but we want to quantify exactly how much data you need to ensure low error. This will also give us some concrete mathematical justification for philosophical claims about simplicity, and the theorems won’t change much when we generalize to VC-dimension in a future post. . . , and. Probably Approximately Correct — a Formal Theory of Learning. In tackling machine learning (and computer science in general) we face some deep philosophical questions. Questions like, “What does it mean to learn?” And, “Can a computer learn?” And, “How do you define simplicity?” And, “Why does Occam’s Razor work? (Why do simple hypotheses do well at modelling reality?)” But before we jump too far ahead of ourselves, we need to get through the basics. All entries. Metodi Statistici per l'Apprendimento. Orario lezioni Materiale bibliografico: Il materiale sarà fornito dal docente sotto forma di dispense integrate da riferimenti bibliografici. Causal Inference

Welcome. The Two Cultures: statistics vs. machine learning? Dictionary of Algorithms and Data Structures. How Do I Start Learning Data Analysis? As an instructor in the Data Analyst Nanodegree, I know how important it is to have a learning plan when starting something new. When I first started learning about data analysis and data science three years ago, I came across the following roadmap of skills, and I couldn’t help but feel overwhelmed. Overview of statistics. Putting the methods you use into context It may come as a surprise, but the way you were probably taught statistics during your undergraduate years is not the way statistics is done. There are a number of different ways of thinking about and doing statistics. It might be disconcerting to learn that there is no consensus amongst statisticians about what a probability is for example (a subjective degree of belief, or an objective long-run frequency?). Typically, scientists are only exposed to the frequentist school, which has been criticised on a number of grounds (discussed briefly below), and this is an incredible shortcoming of standard science education. Not knowing the big picture about other schools of thought, methods of analysis, or ways of interpreting evidence is a serious limitation for anyone who conducts experiments and interprets the results. Sampling Distribution of Difference Between Means. Sampling Distribution of Difference Between Means Author(s) David M. Lane. Olivier Cappé's Home Page. All entries.

Categorical Data

‎www.statisticshell.com/docs/ancova.pdf. Www.sagepub.com/upm-data/21121_Chapter_15.pdf. Julia express. Julia Statistics. Generalized linear model. Linear regression. In statistics, linear regression is an approach for modeling the relationship between a scalar dependent variable y and one or more explanatory variables denoted X. The case of one explanatory variable is called simple linear regression. For more than one explanatory variable, the process is called multiple linear regression. Ordinary least squares. Okun's law in macroeconomics states that in an economy the GDP growth should depend linearly on the changes in the unemployment rate. Here the ordinary least squares method is used to construct the regression line describing this law. In statistics, ordinary least squares (OLS) or linear least squares is a method for estimating the unknown parameters in a linear regression model. This method minimizes the sum of squared vertical distances between the observed responses in the dataset and the responses predicted by the linear approximation. The resulting estimator can be expressed by a simple formula, especially in the case of a single regressor on the right-hand side. The OLS estimator is consistent when the regressors are exogenous and there is no perfect multicollinearity, and optimal in the class of linear unbiased estimators when the errors are homoscedastic and serially uncorrelated. Generalized least squares. Method outline In a typical linear regression model we observe data on n statistical units. The response values are placed in a vector Y = (y1, ..., yn)′, and the predictor values are placed in the design matrix X = [[xij]], where xij is the value of the jth predictor variable for the ith unit.

The model assumes that the conditional mean of Y given X is a linear function of X, whereas the conditional variance of the error term given X is a known matrix Ω. Www.utdallas.edu/~serfling/3332/COVandCORR. Dummy variable (statistics) In statistics and econometrics, particularly in regression analysis, a dummy variable (also known as an indicator variable, design variable, Boolean indicator, categorical variable, binary variable, or qualitative variable) is one that takes the value 0 or 1 to indicate the absence or presence of some categorical effect that may be expected to shift the outcome. Dummy variables are used as devices to sort data into mutually exclusive categories (such smoker/non-smoker, etc.). For example, in econometric time series analysis, dummy variables may be used to indicate the occurrence of wars or major strikes. Electrical Engineering and Computer Science. The Gaussian Processes Web Site.