search for: dlebauer

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2018 Aug 28
0
Scientific Programmer: Simulation Analysis of Engineered Plants (University of Arizona, Tucson AZ)
...that integrates data collected from a variety of handheld, aerial, and ground-based sensor platforms. _____________________ David LeBauer, PhD Director of Data Science for the Arizona Experiment Station 1230 N Cherry Avenue, Tucson, Arizona 85721 207 BSRL University of Arizona 520-621-4381 mailto:dlebauer at email.arizona.edu [[alternative HTML version deleted]]
2010 Sep 30
2
can I add line breaks to the paste() function?
Can I add a line break to the paste() function to return the following: 'this is the first line' 'this is the second line' instead of 'this is the first line this is the second line' ?
2010 Oct 15
2
using optimize with two unknowns, e.g. to parameterize a distribution with given confidence interval
Hi, I would like to write a function that finds parameters of a log-normal distribution with a 1-alpha CI of (x_lcl, x_ucl): However, I don't know how to optimize for the two unknown parameters. Here is my unsuccessful attempt to find a lognormal distribution with a 90%CI of 1,20: prior <- function(x_lcl, x_ucl, alpha, mean, var) { a <- (plnorm(x_lcl, mean, var) - (alpha/2))^2 b
2010 Jun 16
4
Is there a non-parametric repeated-measures Anova in R ?
Hello Prof. Harrell and dear R-help mailing list, I wish to perform a non-parametric repeated measures anova. If what I read online is true, this could be achieved using a mixed Ordinal Regression model (a.k.a: Proportional Odds Model). I found two packages that seems relevant, but couldn't find any vignette on the subject: http://cran.r-project.org/web/packages/repolr/
2010 Jun 17
1
is there a function to find the quantile of the mean of a vector?
Hello, I am interested in finding the quantile of the mean of a vector, something analogous to using the pnorm(), but for an mcmc chain instead of a distribution with known parameters. One approach would be to write a function that finds the index of x_i that minimizes (x-mean(x))^2 I suspect there is a function available to do this, but I can't find it? Thank you, David