Statistics

Advanced Regression Models: Learn which regression technique to apply for what cases? | R Statistics.Net. Applied Time Series Analysis. Any time series with a constant time increment (e.g., day, month, year) is a candidate for use in the course. Examples are daily precipitation measurements, seasonal total streamflow, summer mean air temperature, annual indices of tree growth, indices of sea-surface temperature, and the daily height increment of a shrub.

The first couple of weeks in the course are devoted to organizing you data and getting familiar with the software package Matlab. Matlab and Toolboxes. The course makes extensive use of Matlab. The class scripts and function are updated from time to time using features that may not be available in earlier Matlab versions. The version required for this course is Matlab Release 2007b or higher. For 2015, I am using Matlab Version: 8.4.0.150421 (R2014b). Resident Students. Spring 2015 semester. Resident students submit assignments roughly on weekly intervals according to class progress on the lessons. Powerpoint lecture outlines & miscellaneous files. Time Series Analysis. Time Series Analysis Anne Senter One definition of a time series is that of a collection of quantitative observations that are evenly spaced in time and measured successively.

Examples of time series include the continuous monitoring of a person’s heart rate, hourly readings of air temperature, daily closing price of a company stock, monthly rainfall data, and yearly sales figures. Time series analysis is generally used when there are 50 or more data points in a series. If the time series exhibits seasonality, there should be 4 to 5 cycles of observations in order to fit a seasonal model to the data. Goals of time series analysis: 1. 2. 3. 4. 5. Time series are analyzed in order to understand the underlying structure and function that produce the observations.

It is assumed that a time series data set has at least one systematic pattern. There are numerous software programs that will analyze time series, such as SPSS, JMP, and SAS/ETS. Time series analysis using ARIMA methods Books: Time Series Analysis | R Statistics.Net. Any metric that is measured over time is a time series. It is of high importance because of industrial relevance especially w.r.t forecasting (demand, sales, supply etc). It can be broken down to its components so as to systematically forecast it. This is a beginners introduction to time series analysis, answering fundamental questions such as: what is a stationary time series, how to decompose it, how to de-trend, de-seasonalize a time series, what is auto correlation, etc.

What is a Time Series ? Any metric that is measured over regular time intervals makes a Time Series. Example: Weather data, Stock prices, Industry forecasts, etc are some of the common ones. How To Create A Time Series In R ? Upon importing your data into R, use ts() function as follows. Ts (inputData, frequency = 4, start = c(1959, 2)) # frequency 4 => Quarterly Data ts (1:10, frequency = 12, start = 1990) # freq 12 => Monthly data.

Understanding Your Time Series What Is A Stationary Time Series ? PowerPivot Data Analyst 5 - Creating Relationships. Curvefit.com. The complete guide to nonlinear regression. Statistics and R for the Life Sciences. We will learn the basics of statistical inference in order to understand and compute p-values and confidence intervals. We will provide examples by programming in R in a way that will help make the connection between concepts and implementation. Problems sets requiring R programming will be used to test understanding and ability to implement basic data analyses. We will use visualization techniques to explore new data sets and determine the most appropriate approach. We will describe robust statistical techniques as alternative when data do not fit assumptions required by the standard approaches.

We will also introduce the basics of using R scripts to conduct reproducible research. Topics: Distributions Exploratory Data Analysis Inference Non-parametric statistics This class was supported in part by NIH grant R25GM114818. This course is part of a larger set of 8 total courses running Self-Paced through September 15th, 2015:PH525.1x: Statistics and R for the Life Sciences. Missing Data in R. Probably all of us have met the issue of handling missing data, from the basic portfolio correlation matrix estimation, to advanced multiple factor analysis, how to impute missing data remains a hot topic. Missing data are unavoidable, and more encompassing than the ubiquitous association of the term, irgoring missing data will generally lead to biased estimates. I came across an easy-to-use missing data imputation named Amelia II developed by professor Gary King from Harvard university, as its webpage introduces: Amelia II “multiply imputes” missing data in a single cross-section (such as a survey), from a time series (like variables collected for each year in a country), or from a time-series-cross-sectional data set (such as collected by years for each of several countries).

Amelia II was developed based on R language, so users have to install R before running it, installation of Amelia is staightforward: download and run the exe file, that’s it. Related Missing data imputation.