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Placidia

Saint John, NB, Canada

I am a data scientist living in Saint John, Canada, with over 20 years' experience. I have yet to see a data set I did not like. My analysis stack involves R, Rstudio, Spark-Scala and the Linux command line.

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Top Questions
80 votes

Famous statistical wins and horror stories for teaching purposes

mathematical-statistics data-visualization experiment-design teaching asked Nov 1, 2019 at 13:07
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34 votes

Best factor extraction methods in factor analysis

spss pca factor-analysis asked Feb 24, 2013 at 14:36
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23 votes

CHAID vs CRT (or CART)

spss cart classification-tree asked Jun 8, 2013 at 16:37
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15 votes

Are the degrees of freedom for Welch's test always less than the DF of the pooled test?

hypothesis-testing t-test asked Jan 27, 2013 at 17:21
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13 votes

Test of independence vs test of homogeneity

chi-squared independence heteroscedasticity teaching asked Nov 25, 2013 at 15:53
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9 votes

Survival analysis where covariates are unavailable for censored data

survival asked May 6, 2014 at 15:29
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8 votes

LaTeX for elementary school mathematics

teaching asked Jan 17, 2016 at 21:14
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7 votes

What is the difference between standardized and unstandardized estimates in SEM (thinking of AMOS in particular)?

sem asked Mar 17, 2013 at 17:22
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7 votes

Does the log likelihood become unimodal when the sample size goes to infinity?

mathematical-statistics maximum-likelihood asked Sep 9, 2014 at 16:51
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7 votes

Generalized Linear Model in SPSS with common values among predictors treated as subpopulations. Why?

logistic spss generalized-linear-model aic degrees-of-freedom asked Feb 3, 2013 at 3:31
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Top Answers
130
Should I try to long-distance parent or will I do more harm than good?
parenting.stackexchange.com

117
How scared should we be about convergence warnings in lme4
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79
Cannot find curl-config in Ubuntu 13.04
askubuntu.com

44
What does the anova() command do with a lmer model object?
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33
Probability of a single real-life future event: What does it mean when they say that "Hillary has a 75% chance of winning"?
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20
The difference between varimax and oblimin rotations in factor analysis
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18
Why squared residuals instead of absolute residuals in OLS estimation?
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18
The Differences between Randomized Logistic Regression and Plain-Vanilla Logistic Regression
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17
In a multi-level model, what are the practical implications of estimating versus not-estimating random effect correlation parameters?
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15
What is the VC dimension of a decision tree?
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15
Is ANOVA relying on the method of moments and not on the maximum likelihood?
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14
Functional principal component analysis (FPCA): what is it all about?
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12
Why does shrinkage work?
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12
what does "hessian is singular mean" in SAS proc nlin
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12
Which kind of statistical exact test should I use?
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12
Kernel matrix is not positive definite
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12
From what age should one heed "But I'm not cold!"?
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11
Basic Gini impurity derivation
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11
How does the sampling distribution of sample means approximate the population mean?
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11
Calculate coefficients in a logistic regression with R
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10
Example where a simple correlation coefficient has a sign opposite to that of the corresponding partial correlation coefficient
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10
Poisson regression assumptions and how to test them in R
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10
Could a classical era or middle ages civilization advance in shipbuilding and colonize multiple distant continents?
worldbuilding.stackexchange.com

10
Difference between canonical correpondence analysis and canonical correlation analysis
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10
What should an uninformative prior be for the slope when doing linear regression?
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9
What is Cronbach's Alpha intuitively?
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9
What is the benefit of using Manhattan distance for K-medoid than using Euclidean distance?
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9
Can I trust a significant result of a t-test if the sample size is small?
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9
How to interpret this PCA biplot coming from a survey of what areas people are interested in?
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9
Is a post-hoc test supposed to be performed on transformed or original data?
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