Displaying 20 results from an estimated 200 matches similar to: "How do I get rid of list elements where the value is NULL before applying rbind?"
2010 Jul 16
1
I need help making a data.fame comprised of selected columns of an original data frame.
I must have missed something simple, but still, i don't know what.
I obtained my basic data as follows:
x <- sprintf("SELECT m_id,sale_date,YEAR(sale_date) AS
sale_year,WEEK(sale_date) AS sale_week,return_type,0.0001 +
DATEDIFF(return_date,sale_date) AS elapsed_time FROM
`merchants2`.`risk_input` WHERE DATEDIFF(return_date,sale_date) IS NOT
NULL")
moreinfo <- dbGetQuery(con,
2010 Jul 16
1
Troubles with DBI's dbWriteTable in RMySQL
I am feeling rather dumb right now.
I created what I thought was a data.frame as follows:
aaa <- lapply(split(moreinfo,list(moreinfo$m_id),drop = TRUE), fun_m_id)
m_id_default_res <- do.call(rbind, aaa)
print("==========================================")
m_id_default_res
print("==========================================")
ndf <- m_id_default_res[, c('mid',
2010 Jul 15
1
How do I combine lists of data.frames into a single data frame?
The data.frame is constructed by one of the following functions:
funweek <- function(df)
if (length(df$elapsed_time) > 5) {
rv = fitdist(df$elapsed_time,"exp")
rv$year = df$sale_year[1]
rv$sample = df$sale_week[1]
rv$granularity = "week"
rv
}
funmonth <- function(df)
if (length(df$elapsed_time) > 5) {
rv =
2010 Jul 12
2
exercise in frustration: applying a function to subsamples
>From the documentation I have found, it seems that one of the functions from
package plyr, or a combination of functions like split and lapply would
allow me to have a really short R script to analyze all my data (I have
reduced it to a couple hundred thousand records with about half a dozen
records.
I get the same result from ddply and split/lapply:
>
2006 Mar 13
1
Formatting an anova table using latex
Hi r-helpers,
When I issue the command
latex(anova(raw1.lmer0, raw1.lmer, raw1.lmerI), file = 'raw1.tex',
rownamesTexCmd = c('baR', 'addit', 'multip'), longtable = F, dcolumn
= T, booktabs = T, t able.env = F, colheads = NULL, colnamesTexCmd = c
('', 'df', 'aic', 'bic', 'logl', 'chisq', 'chisqdf',
2008 Apr 13
2
Arrays and functions
Hi, I' am doing a stats project using R to work out the size of a t-test and wilcoxon test depending on the distribution and sample size. I just can't get it to work - I want to put my results from the function size() into an array.At the moment I keep getting the error message:Error in res[distribution, test, samplesize] <- results : subscript out of boundsCan anyone tell me where
2009 Sep 18
1
lapply - value changes as parameters to function?
Hi,
I'm trying to get better at things like lapply but it still stumps
me. I have a function I've written, tested and debugged using
individual calls to the function, ala:
ResultList5 = DoAvgCalcs(IndexData, Lookback=5,
SampleSize=TestSamples , Iterations=TestIterations )
ResultList8 = DoAvgCalcs(IndexData, Lookback=8,
SampleSize=TestSamples , Iterations=TestIterations )
ResultList13
2018 Oct 04
2
Bug : Autocorrelation in sample drawn from stats::rnorm (hmh)
Hi Hugo,
I've been able to replicate your bug, including for other distributions (runif, rexp, rgamma, etc) which shouldn't be surprising since they're probably all drawing from the same pseudo-random number generator. ?Interestingly, it does not seem to depend on the choice of seed, I am not sure why that is the case.
I'll point out first of all that the R-devel mailing list is
2018 Oct 04
2
Bug : Autocorrelation in sample drawn from stats::rnorm (hmh)
Hi Hugo,
I've been able to replicate your bug, including for other distributions (runif, rexp, rgamma, etc) which shouldn't be surprising since they're probably all drawing from the same pseudo-random number generator. ?Interestingly, it does not seem to depend on the choice of seed, I am not sure why that is the case.
I'll point out first of all that the R-devel mailing list is
2001 Dec 09
1
Help for Power analysis
Dear colleague,
I not sure this R code is correctly ? I would to show
the number of Sample Size at Sample Size Axis that line
draw from Power Axis (80%) from R code.
How I show this and select the most appropriate of
this power (.79955687 - 80983575).
Thank for your help and answer.
Best Regards,
Nikom Thanomsieng,
Email: nikom at kku.ac.th
....
#Power analysis: Sample size for
2011 Mar 25
1
Appending data to a data.frame and writing a csv
Dear R helpers
exposure <- data.frame(id = c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20),
ead = c(9483.686,50000,6843.4968,10509.37125,21297.8905,50000,706152.8354, 62670.5625, 687.801995,50641.4875,59227.125,43818.5778,52887.72534,601788.7937, 56813.14859,4012356.056,1419501.179,210853.4743,749961,6599.0862),
pd =
2010 Sep 19
1
Weibull- Random Censoring
I generate random vector from Weibull distribution
sampWB <-urweibull(sampleSize, shape=shape.true, scale=scale.true, lb=0, ub=Inf)
how can I create subvector containing 30% of samplesize of sampWB which should be assigned as Censored data?
The probability for each value in sampWB can be uniform to be included in the subvector.
2018 Oct 05
2
Bug : Autocorrelation in sample drawn from stats::rnorm (hmh)
On 05/10/2018, 09:45, "R-help on behalf of hmh" <r-help-bounces at r-project.org on behalf of hugomh at gmx.fr> wrote:
Hi,
Thanks William for this fast answer, and sorry for sending the 1st mail
to r-help instead to r-devel.
I noticed that bug while I was simulating many small random walks using
c(0,cumsum(rnorm(10))). Then the negative
2010 Aug 11
1
sem & psych
Dear R users,
I am trying to simulate some multitrait-multimethod models using the
packages sem and psych but whatever I do to deal with models which do not
converge I always get stuck and get error messages such as these:
"Error in summary.sem(M1) : coefficient covariances cannot be computed"
"Error in solve.default(res$hessian) : System ist f?r den Rechner singul?r:
reziproke
2012 Jan 13
2
beanplot-Error: sample is too sparse to find TD
Hi all,
Since two days I am trying to find a solution to be able to create
beanplots for my data. When I call the beanplot function the following
error appears:
> beanplot(y1 ~ x1, log="", what=c(1,1,1,0), ylim=c(0,1))
> Error in bw.SJ(x, method = "dpi") : sample is too sparse to find TD
What is really strange: I have 32 different vectors and the problem occurs
for
2006 Mar 12
1
meta / lme
Hi
I'm conducing a meta-analysis using the meta package.
Here's a bit of code that works fine -
tmp <- metacont(samplesize.2, pctdropout.2, sddropout.2,
samplesize.1, pctdropout.1, sddropout.1,
data=Dataset, sm="WMD")
I would now like to control for a couple of variables (continuous and
categorical) that aren't in the equation.
Is meta
2010 Sep 20
1
Removing slected values from original vector and definning new vector with the rest?
sampleSize <- 20
shape.true <- 1.82
scale.true <- 987
sampWB <- rweibull(sampleSize, shape=shape.true, scale=scale.true)
print(sampWB)
censidx <- sample(1:length(sampWB), length(sampWB)*0.3)
Censored.data <- sampWB[censidx]
noncensidx <- defines the rest values of the vector which is not included at Censored.data?
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2010 Sep 16
1
Weibull simulation- number of items to replace is not a multiple of replacement length
Hi,
I write below code for simulation for weibull- estimating parameters by weibullMLE function,
Although I define metrix for the variables still I got this message: number of items to replace is not a multiple of replacement length
Any suggestion
> est=matrix (NA, 2,2)
> se=matrix (NA, 2,2)
> for ( p in 1:2) {
+ sampleSize <- 20
+ shape.true <- 1.82
+ scale.true <- 987
+
2004 May 26
1
Turning pass/fail results into a proportion
Please forgive me, I feel exceptionally like a newbie. Although I've
read screeds of documentation, I just can't see how this is done.
I have a data frame that contains a number of pass/fails for certain
variable sizes. From that, I would like to form another data frame that
contains the proportions of pass/fails per variable.
So, for example:
df <- data.frame( Var=c(3,3,3,4,4),
2010 Jul 21
0
One problem with RMySQL and a query that returns an empty recordset
My last query related to this referred to a problem with not being able to
store data. A suggestion was made to try to convert the data returned by
fitdist into a data.frame before using rbind. That failed, but provided the
key to solving the problem (which was to create a data.frame using the
variables fitdist produces in the object it returns).
I now have almost everything working as