similar to: logistic regression and 3PL model

Hello colleagues, This is a follow up to a question I posed in November regarding an analysis I was working on. Thank you to Dr. Brian Ripley and Dr. John Fox for helping me out during that time. I am conducting logistic regression on data set on psi (ESP) ganzfeld trials. The response variable is binary (correct/incorrect), with a 25% guessing base rate. Dr. Ripley suggested that I

I was wondering whether the following inconsistency of the promax rotation function with the results of a promax rotation using SAS should be considered a bug in the promax function of R. Any comments will be highly appreciated. The following is a loading matrix obtained from a varimax rotation in SAS: # Factor loadings after varimax rotation x <- t(array(c(0.78107, 0.35573,

# I have a question about how factanal is calculating the regression factor # scores based on an oblique rotation (promax) of the factors. # # As is explained in the help file, regression factor scores are # obtained as # # hat f = Lambda' Sigma^-1 x # # However, according to Harman's "Modern Factor Analysis" (e.g. second # edition, pp. 351-352) the formula is # # hat f = Phi

hello R, This is about simulation in psychomtrics in IRT in R. I want to simulate b parameters(item difficulty) with moments of fixed values of mean, st.d, skewness and kurtosis. Is there any specific IRT package in R with those functions to control those moments? I have seen other programs that can control mean and st.d but not skewness and kurtosis. Thank you, helen L [[alternative HTML

Dear all, I am trying to optimize a logistic function using optim, inside the following functions: #Estimating a and b from thetas and outcomes by ML IRT.estimate.abFromThetaX <- function(t, X, inits, lw=c(-Inf,-Inf), up=rep(Inf,2)){ optRes <- optim(inits, method="L-BFGS-B", fn=IRT.llZetaLambdaCorrNan, gr=IRT.gradZL, lower=lw, upper=up, t=t, X=X)

Hi, I was wondering if bash or inputrc has changed form CentOS v4 to CentOS v5? Reason I ask is at the bash cli I can type, for example 'su' and then with the up and down arrows I can scroll through my history and will only see the commands that begin with 'su'. In CentOS 5 this isn't the case. I have added some code to my inputrc file to make this work in CentOS 4 as

When a caller hangs up (e.g. after leaving a voicemail), my British Telecom exchange sends a continuous tone for about 15s and then silence. I can't get asterisk to recognise this tone as a hangup indication. I have tried indications.conf with both country=uk and country=us. My zapata.conf has busydetect=yes, callprogress=yes and I've tried setting busycount from 1 through 7 I am using

Hello R, I am looking for non-parametric simulation in IRT. Is there any IRT package that does non-parametric simulation? helen L [[alternative HTML version deleted]]

Hi I'm presently installing 2.2.8a on Mandrake 9.1 I'm a newbie to Linux as well as Samba, so it's been fun... When I first installed Linux I installed Samba from the discs (2.2.7a), but on reading up on the subject it became clear that I should give installing the source a go. My problem is this - I don't think I have rerouted all of the paths to usr/local/samba from what

Hello, I want to compute Wainer et al's augmented subscore(2001) using IRT but I can't find any packages or relevant code. There is a 'subscore' package in R, but I think it only gives functions to calculate augmented subscores using CTT(classical test theory). Is there other package or code to compute subscores using IRT? If it is not, is there any plan to develop it in

Hi Xavier, the reason you observe this feature is that in the 'constraint' argument you should specify the values under the additive parameterization, i.e., when in the second column of the matrix supplied in 'constraint' you specify 2, then you need to provide the easiness parameters (not the difficulty parameters) in the third column. Check the Details section of ?tpm() and

Hola, I am trying to isolate the memory leak I suspect in a mailman installation ? I found: http://blogs.sun.com/sanjeevb/date/200506 It gives an error: god at irt-smtp-02:~ 9:21am 65 # ./memleak.d 10312 dtrace: failed to compile script ./memleak.d: line 3: probe description pid10312:libc.so.1:malloc:entry does not match any probes I am on SunOS 5.10 Generic_127112-07 i86pc i386 i86pc Are

Hello, I have Asterisk 16.2 on Debian. In the Asterisk CLI, I would like to change 2 things: 1) change the keybindings for commandline editing (what in bash is called "readline" editing of the command line) The CLI is missing some very useful keybindings, and even worse, has misconfigured others, For instance, "ctrl"+"w" should delete the last word backward. But

I found this from ocfs1.4 document: g) NFS OCFS2 volumes can be exported as NFS volumes. This support is limited to NFS version 3, which translates to Linux kernel version 2.4 or later. Users must mount the NFS volumes on the clients using the nordirplus mount option. This disables the READDIRPLUS RPC call to workaround a bug in NFSD, detailed in the following link:

Hello All, I was wondering how I can get the overall Pearson chi^2 test of model fit with its df and p value in the LTM package for the 2PL models. Thanks, -- Davood Tofighi Department of Psychology Arizona State University [[alternative HTML version deleted]]

I have no idea, but Google pointed me to this https://cran.r-project.org/web/packages/subscore/index.html Hth Ulrik "Hyunju Kim" <asdfg4882 at yonsei.ac.kr> schrieb am Di., 15. Mai 2018, 07:21: > > > > Hello, > > > > I want to compute Wainer et al's augmented subscore(2001) using IRT but I > can't find any packages or relevant code. > >

Using the grm function (graded response IRT model) in the ltm package I receive the following error: Error: subscript out of bounds for several scales I'd like to examine. Here's a small example that if run a few times will likley produce the error at least once ch<-array(round(runif(50,1,5)),c(10,5)) grm(ch,start.val="random") ## or

Hi all, I have just installed OSX Server 10.4 and R comes up with the incompatible libxml library message reported by Dan Kelley a few messages ago. Xcode 2 does not ship with Tiger Server. I installed the X-Windows code. I can report that the version of libxml2.2 that is installed in this case is the version 8.0.0 dylib. [6]sboker at munimula:/usr/lib % ls -l libxml2.2* -rwxr-xr-x 1

Hi xen developers, Does any of you know how to disable the cirrus-vga emulation for hvm in xen? I have been trying to disable that from the source codes, but even with that, I still see a VGA controller when I boot up my guest domain. In particular, I would like to do this because I am passing through a graphics card to my guest domain using direct pass through. Thanks, - billy

Dear Marc, Thanks for your feedback! 1. I store it in MySQL. 2. I will add a cronjob to run Solr if I can figure out why its not working on test runs. Maybe I might try to setup a cronjob for solr to avoid having to manually start it everytime. 3. Will turn on the mail_debug in dovecot.conf . Where will it log the problems? Thanks Kevin On Sat, Jan 3, 2015 at 4:45 PM, Marc St?rmer <mail at