DISCLAIMER
The postings on this blog are my own (except as noted) and do not necessarily represent the positions, strategies or opinions of my current, past, and future employers, cats and other family members, relatives, Facebook friends, real friends, Charlie Sheen, people who sit next to me on public transportation, or myself when I’m in my right mind.
Recent Posts
Archives
 February 2022
 November 2020
 October 2020
 September 2020
 August 2020
 July 2020
 May 2020
 January 2019
 December 2018
 October 2018
 September 2018
 November 2017
 September 2017
 May 2017
 February 2017
 January 2017
 December 2016
 September 2016
 August 2016
 July 2016
 June 2016
 January 2016
 July 2015
 February 2015
 January 2015
 December 2014
 November 2014
 October 2014
 January 2014
 September 2013
 May 2013
 April 2013
 February 2013
 August 2012
 July 2012
 June 2012
 February 2012
 May 2011
 April 2011
 March 2011
 February 2011
 January 2011
 December 2010
 November 2010
 October 2010
 September 2010
 August 2010
 July 2010
 June 2010
 May 2010
RSS Links
Feedburner

Blogroll
Recent Posts from: Random TerraBytes
Meta
Tag Archives: trend
Regression Fantasies
Common Reasons for Doubting a Regression Model Finding a model that fits a set of data is one of the most common goals in data analysis. Least squares regression is the most commonly used tool for achieving this goal. It’s … Continue reading
Posted in Uncategorized
Tagged accuracy, autocorrelation, correlation coefficient, dependent variable, heteroscedasticity, intercept, misspecification, model, multicollinearity, Nonlinear relationships, number of samples, outliers, overfitting, precision, regression, sample size, samples, software, standardization, statistical analysis, statistical tests, statistics, stats with cats, stepwise regression, trend, variability, variance
13 Comments
Regression Fantasies: Part III
Is Your Regression Model Telling the Truth? There are many technologies we use in our lives without really understanding how they work. Television. Computers. Cell phones. Microwave ovens. Cars. Even many things about the human body are not well understood. … Continue reading
Regression Fantasies: Part I
Five Common Reasons for Doubting a Regression Model Finding a model that fits a set of data is one of the most common goals in data analysis. Least squares regression is the most commonly used tool for achieving this goal. … Continue reading
You’re Off to Be a Wizard
The process of developing a statistical model (https://statswithcats.wordpress.com/2010/12/04/manypathsleadtomodels/) involves finding the mathematical equation of a line, curve, or other pattern that faithfully represents the data with the least amount of error (i.e., variability). Variability and pattern are the yin and … Continue reading
Posted in Uncategorized
Tagged AIC, BIC, cats, coeffiient of determination, Cook’s Distance, dependent variable, DFBETAs, Ftest, jargon, model, multicollinearity, Normal distribution, probability, regression coefficients, residuals, standard error of estimate, statistical analysis, statistical leverage, statistical tests, statistics, stats with cats, ttest, trend, uncertainty, variability, variance inflation factor
8 Comments
Secrets of Good Correlations
If you’ve ever seen a correlation coefficient, you’ve probably looked at the number and wondered, is that good? Is a correlation of 0.73 good but not a correlation of +0.58? Just what is a good correlation and what makes a … Continue reading
Posted in Uncategorized
Tagged cats, coefficient of determination, correlation coefficient, measurement scales, multiple correlation, number of samples, objectives, outliers, partial correlation, Rsquare, sample size, shrunken correlation, software, statistical analysis, statistical tests, statistics, stats with cats, trend, variance
36 Comments
Fifty Ways to Fix your Data
Fifty Ways to Fix your Data (Sing to the tune of “Fifty Ways to Leave Your Lover” by Paul Simon) The problem is all about your scales, she said to me The Rsquares will be better if you’ve matched ’em … Continue reading
Posted in Uncategorized
Tagged BoxCox, cats, correlation coefficient, differencing, information, lags, math, measurement, measurement scales, model, Normal distribution, recoding, rescaling, smoothing, software, standardization, statistical analysis, statistics, stats with cats, transformations, trend
31 Comments
Purrfect Resolution
No matter what their area of expertise, statisticians are asked certain questions with such predictability that it borders on the deterministic. No question is asked more often than: How many samples do I need? Most statisticians wish they could answer … Continue reading
Posted in Uncategorized
Tagged cats, number of samples, polls, resolution, rule of thumb, sample size, samples, statistical tests, stats with cats, surveys, trend, uncertainty
12 Comments
Try This At Home
We are all awash in statistics. Every day, we see the probability of precipitation, the results of opinion polls, changes in the stock market, your grades in school, or the batting average of the baseball team you follow. It’s surprising, … Continue reading
Posted in Uncategorized
Tagged cats, cell phone, hobby, information, journal, politics, probability, software, statistical analysis, statistics, stats with cats, trend, tv
4 Comments
Why Do I Have To Take Statistics?
When you were in school, you probably asked the question, why do I have to take statistics?” Your adviser told you: “because it’s required for the degree.” “But why,” you said “why would I ever need to use statistics?” Everybody … Continue reading
Posted in Uncategorized
Tagged accuracy, anomaly, information, precision, standardization, statistics, trend, uncertainty
19 Comments
Stats With Cats: What’s inside
Stats With Cats is a great companion to any introductory textbook in statistics. You won’t find a lot of equations or descriptions of the central limit theorem, probability, and hypothesis testing. You can find that information in traditional statistical texts. … Continue reading
Posted in Uncategorized
Tagged accuracy, cats, information, math, Normal distribution, polls, population, precision, sample size, samples, statistical analysis, statistical tests, statistics, stats with cats, surveys, t distribution, trend, uncertainty
1 Comment