Displaying 20 results from an estimated 44 matches for "livia".
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liviu
2007 Jul 03
4
sequences
Hi, I would like to generate a series in the following form (0.8^1, 0.8^2,
..., 0.8^600)
Could anyone tell me how can I achieve that? I am really new to R.
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2007 Oct 02
5
Linear Regression
Hello,
I would like to fit a linear regression and when I use summary(), I got the
following result:
Call:
lm(formula = weight ~ group - 1)
Residuals:
Min 1Q Median 3Q Max
-1.0710 -0.4938 0.0685 0.2462 1.3690
Coefficients:
Estimate Std. Error t value Pr(>|t|)
groupCtl 5.0320 0.2202 22.85 9.55e-15 ***
groupTrt 4.6610 0.2202 21.16 3.62e-14
2007 Sep 12
2
Tick intervals
Hi, I would like to plot a histogram with the following codes, and I would
like to make the tick intervals smaller. I tried to add "lab=c(1,1,12)", but
nothing changes.
par(mfrow=c(1,1),font=1, cex=0.8)
hist (data1, seq(-0.01,0.3,0.01),freq = FALSE,
main="Figure1.",xlab="return",lab=c(1,1,12))
lines(density(data1), col="blue")
Could anyone give me sone
2007 Jul 05
3
Loop and function
Hi All, I am trying to make a loop for a function and I am using the
following codes. "p" and "var" are some matrix obtained before. I would like
to apply the function "gpdlow" for i in 1:12 and get the "returnlow" for i
in 1:12. But when I ask for "returnlow" there are warnings and it turns out
some strange result.
for (i in 1:12){
gpdlow
2007 Jul 11
1
CDF for pareto distribution
Hi, I would like to use the following codes to plot the CDF for pareto
distribution. Before doing this, I have plot the emperical one.
x <- seq(1.6, 3, 0.1)
lines(x,pgpd(x, 1.544,0.4477557,), col="red")
Could anyone give me some advice whether the above codes are correct?
Many thanks.
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2007 Oct 31
2
cbind()
Hello,
I would like to use the cbind() function to construct a matrix used in the
middle of a function as following
for (i in 1:1000) {
b[i] <- function(cbind(a[[1]][[i]],
a[[2]][[i]],a[[3]][[i]],...a[[67]][[i]]))
}
Is there an easy way of achieving this rather than "cbind" every column?
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2009 Jun 16
0
ui and ci explanatory documentation
Hi Livia and everyone,
Did you ever get a response on this question from last year (Jan 2008)?
I am also looking for more explanatory documentation on the
ui and ci parameters for the function constrOptim().
The examples provided in the R help and the full reference
man...
2007 Jun 13
2
Fitted Value Pareto Distribution
I would like to fit a Pareto Distribution and I am using the following codes.
I thought the fitted (fit1) should be the fitted value for the data, is it
correct? As the result of the "fitted" turns out to be a single value for
all.
fit=vglm(ycf1 ~ 1, pareto1(location=alpha), trace=TRUE, crit="c")
fitted(fit)
The result is
fitted(fit)
[,1]
[1,] 0.07752694
2007 Jun 29
2
cbind
Hi, I have a series of return data, a and b are factors. I would like to
build a matrix which contains each vector of "returns". I am thinking about
something as following, but I guess there should be a sensible way of doing
this.
returns <- split(return, list(regimef, assetf))
cbind(returns[[1]], returns[[2]],...,returns[[n]])
Could anyone give me some advice? Many thanks.
--
2007 Sep 17
2
vector name
I have got a list named "filtered", I would like to construct alist named
"fdata" as following:
fdata <- cbind(matrix(unlist(filtered),ncol=28), myregime)
If I try names(filtered), it gives all the correct name for each vector, but
if I try names(fdata), it appears "filtered[[1]]" "filtered[[2]]" ...,
How can I keep the name in "fdata"?
2007 Jun 18
11
Optimization
Hi, I would like to minimize the value of x1-x2, x2 is a fixed value of 0.01,
x1 is the quantile of normal distribution (0.0032,x) with probability of
0.7, and the changing value should be x. Initial value for x is 0.0207. I am
using the following codes, but it does not work.
fr <- function(x) {
x1<-qnorm(0.7,0.0032,x)
x2=0.01
x1-x2
}
xsd <- optim(0.0207, fr,
2007 Jul 10
3
ECDF, distribution of Pareto, distribution of Normal
Hello all,
I would like to plot the emperical CDF, normal CDF and pareto CDF in the
same graph and I amusing the following codes. "z" is a vector and I just
need the part when z between 1.6 and 3.
plot(ecdf(z), do.points=FALSE, verticals=TRUE,
xlim=c(1.6,3),ylim=c(1-sum(z>1.6)/length(z), 1))
x <- seq(1.6, 3, 0.1)
lines(x,pgpd(x, 1.544,0.4373,-0.2398), col="red")
y
2007 Jun 19
2
Histogram
Hello, I am using the following codes to plot a histogram and density line
for x. For the density line, I just want it to show the two tails, eg, for x
larger than 0.05 ans smaller than -0.05
hist (x, seq(-0.1,0.1,0.01),freq = FALSE)
lines (density(x,bw="SJ"), x> 0.05 & x< (-0.05), col = "red")
But is does not work, can anyone give me some advice?
--
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2007 Dec 03
2
Linear Regression, Data is a list
Hello,
I would like to perform a linear regression and the data is a list.e.g
lm(list$abc~., data=list) or lm(abc~., data=list), which would give the same
result.
The problem is I would like to call the response variable in a more general
form. What I try to achieve is sth like lm(list$(paste("a","b","c"))~.,
data=list), but it does not work.
Could anyone give me
2007 Nov 07
2
Linear Regression
Hello everyone,
I would like to a linear regression with the following code.
lm(a[,"fquamsci"]~., data=a)
a is a list with class "mts" "ts" , and "fquamsci" is the name of the
response variable in a. I would like to do a linear regression of "fquamsci"
to the rest of the variables. But it turns out the "fquamsci" is also
included in
2007 Jun 01
2
tapply histogram
Dear members,
I would like to pass the histogram settings to each subset of the dataframe,
and generate a multiple figures graph.
First, can anyone tell me how to generate a multiple figures environment? I
am trying
mfrow=c(2,4) and nothing appears.
Secondly, I want to pass the following function in tapply()
hist(x, freq=FALSE)
lines(density(x), col="red")
rug(x)
how can I manage
2007 May 31
2
Import data from Access
Hi, I want to import some data from Access and I am using the following
codes:
testdb <- file.path("c/../db1")
channel <- odbcConnect("testdb")
sqlFetch(channel,"tbl",colnames = TRUE, rownames = FALSE)
It comes out the error message:
1: [RODBC] ERROR: state IM002, code 0, message [Microsoft][ODBC Driver
Manager] Data source name not found and no default
2007 Jun 19
2
Function -return value
Hi, I am trying to write a function with the following codes and I would like
it to return the values for "alpha
beta para parab " seperately. Then I would like to use this funstion for
"variable" with factor "a" and "b". But the result turns out to be a matrix
with element like "Numeric,2" ... I guess they are just the values for
2007 Jul 03
2
EWMA in fMultivar
Hello, I would like to use the function EWMA() in the fMultivar Package and I
have a series of data x, which is the returns series. Basically, I would
like to get the variance estimation using EWMA.
I am trying something like EWMA(x, lambda) and I have a couple of questions:
Should x be the returns series or price series in my case?
When I get the result, there are the same numbers of data
2007 Dec 13
6
ls() pattern
Hello everyone,
I get some data in the following format and I would like to combine them to
form a dataframe.
The data is like:
cbcname1 = 0.1,
cbcname2= 0.2,
cbcname3=0.3,...
name1, name2, name2 are just some random names. I would like to achieve sth
like:
(cbcname1=0.1, cbcname2=0.2, cbcname3=0.3,......)
I am using the following codes
do.call(cbind,