search for: smatr

...will do an MA regression on all my data point together, but shows an error when I try to do pairwise comparisons between groups. Thank you, Ioulia -------- On Fri, May 11, 2012 at 2:09 AM, Ioulia Bespalova <bespa20i at mtholyoke.edu> wrote: > Hi there, > > I've been using the SMATR package to do standardized major axis (SMA) > regression on allometric data, and I've been able to to pairwise > comparisons of slope & elevation between multiple study sites. > > Now I'm trying to do the same thing using major axis (MA) regression, > but I'm getting...

Hi All, I am confused with SMATR's test for common slope. My null hypothesis here is that all slopes are parallel (common slopes?), right? So if I get a p value < 0.05 means that we can have confidence to reject it? That slopes are different? Or the other way around? it means that we have statistical confidence that the slo...

I am having trouble extracting residuals from Major Axis and Standardized Major Axis fits, using the smatr package. I wish to understand the relationship between density of wood in twigs and trunks, and how the slope of their relationship varies among sites, among families, and with tree size. These variance-partitioning desires push the analysis toward a mixed model framework. However, I am n...

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Hi there, I've been using the SMATR package to do standardized major axis (SMA) regression on allometric data, and I've been able to to pairwise comparisons of slope & elevation between multiple study sites. Now I'm trying to do the same thing using major axis (MA) regression, but I'm getting errors (SMATR should be...

Hi, hres <- hclust(smatr,method="single") hresd<-as.dendrogram(hres) as.dendrogram(hres) `dendrogram' with 2 branches and 380 members total, at height 2514.513 plot(hresd,leaflab="none") #<-error here. #the plotted dendrogram is incomplete. The x axis is not drawn. #The interested reader c...

[Originally sent this to r-help at lists.R-projects.org, but in case that's the wrong list I'm re-posting. Apologies if this becomes a re-post] -------------- next part -------------- An embedded message was scrubbed... From: Jonathon Kopecky <jkopecky at umich.edu> Subject: Need to fit a regression line using orthogonal residuals Date: Mon, 29 Jan 2007 14:52:24 -0500 Size: 1138

...n get the values using the "lm" function, but that uses OLS to calculate the parameters. I have been unable to find help online or in the reference books that I have. I suppose I am looking for either a way to extract an AIC and Likelihood value from a function that performs RMA, like the smatr package (which I have been unable to do), or looking for a way to use the "lm" or other internal R functions to perform RMA. Thank you for any help and your time. Sincerely, Chris Cunningham ----------------------------------------------------------------------------------------------...

Hello all; My question is part statistical and part R. I have performed model II major axis regression in R using both the smatr() and lmodel2() packages, but neither offers an option to statistically weight my regression. I have a vector of weights which I would like to apply to each of my regression points (x vs. y), and was hoping that someone out there could provide me with some help on this issue. I have searched on the...

I have a glm regression (quasi-poisson) of log(mu) on x but I have varying degrees of confidence in the x values, and can attach a numerical weighting to each. Can anyone help me with suggestions of how to analysise this. Is there an R package that would help? Wendy [[alternative HTML version deleted]]

Hello, I am using function lmodel2 to calculate RMA regression between life-history traits in ladybirds beetles. It works well but I am not able to plot an RMA regression line on the scatterplot of my data. I am of course unable to plot the confidence intervals. For ordinary least square regression abline(lm(x~y))works well but for RMA regression, abline(lmodel2(x~y))does not do it. If somebody

Hi, for testing if the slope of experimental data differs from a given slope I'm using the function "test_regression_against_slope" (see below). I am now confronted with the problem that I have data which requires a modelII regression (also called reduced major axes regression (RMA) or geometric mean regression). For this I use the function "modelII" (see below). What

...t;,"seqmon","session","setRNG","sfsmisc","sgeostat","s hapefiles","shapes","SharedHT2","simex") TEMP <- c(TEMP,"simpleboot","SIN","skewt","sm","sma","smatr","smoothSurv","sn","sna","som","SoPhy","sound","sp","SparseLogReg","SparseM","spatial","spatialCovariance","spatstat","spc","spdep","spe","...

CRAN (and crantastic) updates this week New packages ------------ * disclapmix (0.1) Maintainer: Mikkel Meyer Andersen Author(s): Mikkel Meyer Andersen and Poul Svante Eriksen License: GPL-2 http://crantastic.org/packages/disclapmix disclapmix makes inference in a mixture of Discrete Laplace distributions using the EM algorithm. * EstSimPDMP (1.1) Maintainer: Unknown Author(s):