search for: stimulate

Hi all, I need to check for a difference between treatment groups in the parameter of the geometric distribution, but with a cut-off (i.e. right censored). In my experiment I stimulated animals to see whether I got a response, and stopped stimulating if the animal responded OR if I had stimulated 10 times. Since the response could only be to a stimulation, the distribution of response times is discrete (so I can't use survival analysis). I am interested in assessing at wh...

...l and the residual variance is fixed at 1). attr(lme4::VarCorr(model)$E, "stddev")^2 / (1*(pi^2)/3 + attr(lme4::VarCorr(model)$E, "stddev")^2 + attr(lme4::VarCorr(model)$C, "stddev")^2 + attr(lme4::VarCorr(model)$D, "stddev")^2 ) My question is can I use stimulate(model) to generate values that I can then use to do parametric bootstrap analysis and generate the confidence intervals? Something like this: n<-length(A) niter<-1000 y<-matrix(nrow=n,ncol=niter*2) for (i in 1:niter) { y[,I(i*2-1):I(i*2)]<-simulate(model)[,1] } rvalues<-numeric()...

Hi, I have tried to use uniroot to solve a value (value a in my function) that gives f=0, and I repeat this process for 10000 times(stimulations). However error occures from the 4625th stimulation - Error in uniroot(f, c(0, 2), maxiter = 1000, tol = 0.001) : f() values at end points not of opposite sign I have also tried interval of (lower=min(U), upper=max(U)) and it won't work as well.

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Often, when exploring a dataset, I'd like to plot several very different Y variables against the same X variable, in panels stacked one over the other. Is there an easy way to do this? I'd like to achieve an elegant look similar to the look achieved by lattice in conditioned plots--for instance no space between panels. But unlike in straightforward conditioned plot, each panel may be on a

...the new version is available on CRAN. xlsReadWrite natively reads and writes Excel files (v97 - 2003). o Changes from v1.1.1 to v1.3.3 (versions between never really published) - ROWNAMES-support also for matrices (not only for data.frame) - explicit rowNames argument in interface. (stimulated by email Adrian Dusa) - support for DATE and TIME values: Excel date and/or time values can be retrieved as ISO-8601 format string. - Either explicitly with the colClasses entries: - "isodate" as "YYYY-MM-DD" - "isotime" as "hh:mm:ss"...

...resenting points in a scatterplot, ... ) are interpreted, so to speak, "intuitively" -- the resulting perception is formed by processes which are hard to ascertain consciously, and the overall effect can only be ascertained by looking at it, and noting what impression one has formed. They stimulate mental responses in the domain of perception of spatial relationships. Numbers, and text, on the other hand, while still shapes from the optical point of view, up to the point of their impact on the retina, provoke different perceptions. They are interpreted "analytically" stimulating me...

hello people, I want to make a biased dice using the sample() function and print out the results after n number of runs, I've successfully generated the dice using the following command: mydie2<-function(n=1000,y=NULL,...){ for(i in 1:n){ x<-sample(1:6,n,replace=TRUE,prob=c(1,1,2,3,2,1)/10) x=runif(n) if(x<=1/10){y[i]=1} else if(x<=2/10){y[i]=2} else if(x<=4/10){y[i]=3} else

...stest collector, I just want to create something that people can build on. There are a lot of algorithms out there that require similar underlying data structures - an efficient heap, lock-free work queues, and so on. I figure if I can provide those along with a working example, it may help to stimulate further development. I chose this particular algorithm to start with because it seemed fairly easy to implement. Eventually I want to do a multi-generation design - most of the research papers out there seem to settle on a per-thread copying collector for young generations, and a heap-based ma...

These are some points stimulated by reading about C history (and related in their implementation). 1) On some platforms > as.integer("0xA") [1] 10 but not all (not on Solaris nor Windows). We do not define what is allowed, and rely on the OS's implementation of strtod (yes, not strtol). It seems that glib...

...g each of the zones would result in better recovery. Prior efforts had evolved from single-stage, limited entry treatments to multiple-stage treatments with composite frac plugs and frac baffles. microelectrophoretically Core tests on offset acreage had revealed that 3 of 10 coal seams had not been stimulated by these treatments and, on average, ten feet of coal was not being effectively stimulated. If the CT fracturing approach is successful in improving this situation, CONSOL calculated that an additional net present value of 1 million could be added per 160-acre lease, based on a gas price of 2.50....

After attending my first useR! conference I want to thank the organizers for doing a wonderful job and the presenters for their high quality presentations and stimulating ideas. The conference venue was excellent and of course Vienna is one of the greatest cities in the world to visit. useR! is one of the most fun conferences I've attended. Thanks again! -- Frank E Harrell Jr

Hi list, I use a .xml file for a function's demo in the R package I'm creating. Since it doesn't belong to any of the 'standard' folders, i.e. those mentioned in the 'Writing R Extension', I put it in a folder call "myXML", much like the 'iris.xl' file in 'xls' folder from 'gdata' package, for example. After running R CMD build,

Hello, We are trying to figure out how to preserve the low-frequency content when we try to convert a .wav file to an .opus file. What settings in Opus that can accomplish this? Sincerely, Vinson Go cid:image001.png at 01C94EE1.4DA09EF0 TBSI - SIMPLICITY in Neuro-Solutions <http://www.tbsi.biz/> Tethered and Wireless Solutions for Neural Recording and Stimulation Vinson

Dear R list, I would like to perform an ANOVA in a set of measurements, but I have problems formatting the data. The data is a two dimensional array containing two columns: - "Stim" : the type of stimulation (string) - "Ratio" : a ratio of two numeric values Now, because some values are missing in the data (defaulting to zero), part of this array will be populated with NA

...own in March. In a brief statement on the FCC's website (www.fcc.gov) Powell said, "Having completed a bold and aggressive agenda, it is time for me to pursue other opportunities and let someone else take the reins of the agency. During my tenure, we worked to get the law right in order to stimulate innovative technology that puts more power in the hands of the American people, giving them greater choices that enrich their lives." Speculation had been high before the November elections that Powell would be leaving the FCC regardless of who won the presidency. In January, industry insider...

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Dear R-Listers, to measure the psychometric curve of pitch discrimination, one sequentially presents two tones of slightly different pitch to an observer (animal will do), and asks "which is higher". The pschometric curve is the fraction of correct responses plotted against the pitch difference. It passes through 50% (pure guessing) at zero and normally approaches 100% at large

This is a question about the use of the Cox proportional hazards model to analyze event histories. I am looking at the responses of sympathetic nervous system activity to a stimulus. The activity I observe is a burst that can only occur once per heart beat cycle (e.g., a binary count). Typically bursts occur in 60-80% of the heart cycles * sensory stimuli can modify these burst probabilities.

...he arguments into a matrix of 0's of the right dimensions. About the only thing to notice is that the apply() construction returns either a list or matrix depending on whether a matrix is square or not (a subtlety that tripped me up in my first version of this code). I would be pleased if this stimulated others to come up with cleverer/more elegant approaches that they would share, as it's the sort of thing that I'll learn from and find useful. Cheers to all, Bert Gunter