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Tag Archives: software
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, Non-linear 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 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
Dealing with Dilemmas
A decade or so ago, I always feared and was the frequent victim of hardware and software problems. It was a logical consequence of a craftsman routinely pushing his tools way beyond the limits of their capabilities. But the software … Continue reading
Posted in Uncategorized
Tagged cats, client, data scrubbing, politics, samples, software, statistical analysis, statistics, surveys
4 Comments
Grasping at Flaws
Even if you’re not a statistician, you may one day find yourself in the position of reviewing a statistical analysis that was done by someone else. It may be an associate, someone who works for you, or even a competitor. … Continue reading
Posted in Uncategorized
Tagged cats, correlation coefficient, criticism, dependent variable, jargon, math, mean, Normal distribution, number of samples, objectives, population, precision, probability, rule of thumb, sample size, samples, software, statistical analysis, statistical tests, statistics, stats with cats, uncertainty, variability
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, R-square, 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 R-squares will be better if you’ve matched ’em … Continue reading
Posted in Uncategorized
Tagged Box-Cox, 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
Time Is On My Side
If you do much data analysis it won’t be long before you work with data measured over a range of times. When you do see time-series data, you’ll find that time scales and time units have some very quirky properties. … Continue reading
Posted in Uncategorized
Tagged cats, jargon, math, resolution, software, standardization, statistical analysis, statistics, stats with cats, time
13 Comments
Weapons of Math Production
In theory, if you have the free time, you can calculate any statistic you might need using nothing more than a pencil and paper. After all, it’s just matrix mathematics. With a lot of data or a complicated procedure, though, … Continue reading
Posted in Uncategorized
Tagged cats, hardware, math, PCs, R language, SAS, software, SPSS, statistical analysis, statistics, stats with cats
17 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
Reality Statistics
During the 1970s, statistical analyses were done on mainframe computers that were as big as elephants. They were sequestered in their own climate-controlled quarters, waited on command and reboot by a priesthood of system operators. Conducting a 1970s era statistical … Continue reading
Posted in Uncategorized
Tagged cats, hardware, PCs, polls, SAS, software, SPSS, statistics, stats with cats, surveys
7 Comments
Stats With Cats Blog 