Displaying 20 results from an estimated 300 matches similar to: "non-metric multidimensional scaling"
2011 Oct 08
0
Accouting for temporal correlation in linear regression
I measured nitrate concentration and primary production (PP) biweekly for
23 months in one headwater stream. I would like to use linear regression
to determine if PP is related to nitrate concentration. My dataframe is
called "data" and consists of the vectors Rdate, PP, and nitrate. Rdate
is the observation date in class "date" and PP is primary production.
I first
2008 Jun 19
1
PrettyR (describe)
#is there a way to get NA in the table of descriptive statistics instead of
the function stopping Thank you in advance
#data
x.f <- structure(list(Site = structure(c(9L, 9L, 9L, 9L, 9L, 9L, 9L,
9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 9L,
9L, 9L, 9L, 9L), .Label = c("BC", "HC", "RM119", "RM148", "RM179",
"RM185",
2011 Mar 15
2
Calculate monthly means
I am trying to calculate monthly means by year of phosphates and nitrates from a multi year data set. Can anybody help me out with the most effective way to do this?
My data looks like this:
Collection_Date Test.Name Value
2000-01-24 17:00:00 Phosphate 0.108
2000-01-24 17:00:00 Nitrate 0.037
2001-11-12
2009 Aug 05
0
Strontium Nitrate
Hello,
my name is Toby, and i live in Sydney Australia. i would like to buy a 25Kg bag of strontium nitrate and have it delivered to an address in sydney. i understand that long distance postage can sometimes be very costly, so can you please give a a quote for the 25Kg bag, plus the postage cost to my address in sydney.
thankyou for your time
2008 Aug 21
1
summary.lme and anova question
Dear all,
When analyzing data from a climate change experiment using linear mixed-effects models, I recently
came across a situation where:
- the summary(model) showed a significant difference between the levels of a two-level factor,
- while the anova(model) showed no significance for that factor (see below).
My question now is: Is the anova.lme() approach correct for that model? And why does
2002 Jun 06
2
covariance analysis model
Dear list users,
I have trouble with covariance analysis.
I measured nitrate concentrations in the soil (NO3) and the percentage of
legumes (LEG, continuous), affected by 2 different CO2 concentrations (CO2,
discrete). I suspect that CO2 has an effect on LEG and NO3, but also that
LEG has an effect on NO3, so this is the formula I wrote to test this:
NO3 ~ CO2 + LEG + CO2:LEG
Will LEG be
2013 Jan 30
0
betadisper plot
Hello,
I tried to make a betadisper plot; however, it is quite messy at the moment with lines and symbols.
I made two plots, one focusing on sites and the other on treatments.
This is the code that I used:
plot(betadisper(vegdist(y.nth,method="euclidean"),site))
plot(betadisper(vegdist(y.nth,method="euclidean"),treatment))
I have a few questions pertaining to how I could
2012 Sep 14
0
puppet master replica in different data center and subnet
Any suggestions on the best way to configure a puppet master replica/puppet
HA/failover in different data center and subnet? Thought about masterless
puppet, but seems like it is only good for some number of puppet agents.
Thanks,
Myra
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To view this discussion on the web visit
2011 Apr 12
2
The three routines in R that calculate the wilcoxon signed-rank test give different p-values.......which is correct?
I have a question concerning the Wilcoxon signed-rank test, and
specifically, which R subroutine I should use for my particular dataset.
There are three different commands in R (that I'm aware of) that calculate
the Wilcoxon signed-rank test; wilcox.test, wilcox.exact, and
wilcoxsign_test. When I run the three commands on the same dataset, I get
different p-values. I'm hoping that
2014 Jun 19
1
R is converting arg input to scientific notation, which is bad!
Hello,
Firstly, real new to R here.
I have a function intended to evaluate the values in columns spread over
many tables. I have an argument in the function that allows the user to
input what sequence of tables they want to draw data from. The function
seems to work fine, but when the user inputs a single number (over 9)
instead of a sequence using the : operator, I find an error message:
the
2011 Jul 20
0
Cleveland Dot plots: tick labels and error bars
Dear list,
I've been learning how to make a 2x2 paneled dotplot in lattice without any
previous experience using lattice.
my code thusfar is:
nut<-read.table("/Users/colinwahl/Desktop/nutsimp_noerror.csv", T, sep=
",")
attach(nut)
nut1<-data.frame(Nitrate, Total_Nitrogen, Phosphate, Total_Phosphorus)
nut1<-as.matrix(nut1)
rownames(nut1)<-group
2012 Dec 31
4
error when using subset (0 observations)
Hi, how are you?
My name is Irucka Embry and I would like assistance on properly
subsetting some data obtained from a .csv file.
> file <-"info_n.csv"
> INFO<- getMetaDataFromFile(file)
INFO is 92 observations of 14 variables
> INFO<- subset(INFO,site.no==02169570)
INFO is 0 observations of 14 variables
When the site.no is used I should have 1 observation of 14
2013 Apr 10
0
Problem with ode
Hi,
I am trying to run a 1D nutrient-phytoplankton-zooplankton model in R
using the package 'deSolve'. The code is shown below:
DEPTH = seq(2.5, 147.5, 5)
NPZ = function(t, state, params){
with(as.list(params), {
P <- state[1:NB]
Z <- state[(NB + 1): (2*NB)]
N <- state[(2*NB + 1): (3*NB)]
F.I = function(z, hr){
I0 = function(hr){
2010 Jan 12
1
Drought Severity Index (DSI)
Does anyone have the code to calculate the drought severity index?
--
Muhammad Rahiz | Doctoral Student in Regional Climate Modeling
Climate Research Laboratory, School of Geography & the Environment
Oxford University Centre for the Environment, University of Oxford
South Parks Road, Oxford, OX1 3QY, United Kingdom
Tel: +44 (0)1865-285194 Mobile: +44 (0)7854-625974
Email: muhammad.rahiz
2007 Jul 02
3
help again
hi
i try to use arima and holtwinter to predict drought from 1895-2006
but i cannot read whole period of time and i try to do the exponent fitting,
but it comes out as the coordinate x-y error
i send the source code and data to take a look
if anyone can help me, i am really new in R
thank u so much
jam
2005 Apr 21
2
ANOVA model
Hi,
Could someone tell me if this is the correct model syntax for the
following dataset:
lme(height~treatment+genotype+treatment*genotype,drought,random=~genotyp
e)
The dataset has two factors: one fixed - treatment, and one random -
genotype. I need to test the effect of both factors to identify their
significance. There are multiple (but not equal) replicates at each
level of genotype (the
2005 Mar 17
2
Repeated Measures, groupedData and lme
Hello
I am trying to fit a REML to some soil mineral data which has been
collected over the time period 1999 - 2004. I want to know if the 19
different treatments imposed, differ in terms of their soil mineral
content. A tree model of the data has shown differences between the
treatments can be attributed to the Magnesium, Potassium and organic
matter content of the soil, with Magnesium being the
2007 Mar 16
1
Problem installing R onto Solaris 2.10 system - need advice!!!!!
Dear R-Help friends,
I am unable to get the latest version of R (2.4.1) to compile on my solaris 10
system - has anybody else experienced this problem and are you able to offer me
any advice?
I appreciate your time, many thanks,
Jenny Barnes
Here are my CURRENT specifications:
platform sparc-sun-solaris2.10
arch sparc
os solaris2.10
2007 Jan 10
2
correlation value and map
Dear R-help community,
I have 2 different arrays of precipitation data each of the same dimensions of
[longitude, latitude, time] dim=[30,32,43], called array1 and array2. I need to
correlate them. This is the code I used to get one overall correlation value for
the whole of the area of interest:
> result <- cor(array1,array2,use="complete.obs")
> result
This give me a
2007 Jun 06
3
random numbers selection - simple example
Dear R-help,
Which random number generator function would you recommend for simply picking 15
random numbers from the sequence 0-42? I want to use replacement (so that the
same number could potentially be picked more than once).
I have read the R-help archives and the statistics and computing book on modern
Applied statistics with S but the advice seems to be for much form complicated