search for: cronbachs

¿existe algún método en el cual no sea necesario hacer este trabajo y que aparezcan los nombres de las preguntas? label.cronbach <- label.var(p01, "¿Le agrada el programa que se le ha mostrado? ") label.cronbach <- label.var(p02, "¿Cree que ayuda en el aprendizaje?") label.cronbach <- label.var(p03, "¿Propicia el trabajo en el equipo?") label.cronbach

rm(list = ls()) #borra todo lo anterior en memoria setwd("G:/Public/Documents/R/EPICALC/") #como se llama la data desde su path sanda<-read.csv("sandavid2.csv",header=TRUE, sep=",", dec=".") use(sanda) attach (sanda) library (MASS) label.cronbach <- label.var(p01, "¿Consume mucho pan? ") ####¿Hay alguna manera de nombrarlos

Hola, Todos estamos muy bien, gracias. Con respecto de tu consulta, creo que ofreces poca información para poder reproducir o intentar emular tu inquietud (aunque en este grupo de voluntarios hay gente muy hábil que seguramente podrá ayudarte mejor). Yo me pregunto, por ejemplo: ¿cómo son tus datos originalmente?¿los estás leyendo de otro programa?¿los tienes en un texto plano?¿podrías enviar

¿existe algún método en el cual no sea necesario hacer este trabajo y que aparezcan los nombres de las preguntas? label.cronbach <- label.var(p01, "¿Le agrada el programa que se le ha mostrado? ") label.cronbach <- label.var(p02, "¿Cree que ayuda en el aprendizaje?") label.cronbach <- label.var(p03, "¿Propicia el trabajo en el equipo?") label.cronbach

hie 1...i'm trying to carryout a relibility testusing cronbach's alpha what fuctin do i use. 2.. this is more of a statistical question.if the alpha value for all the variables is negative what does it mean. and if the alpha value is negative for all tyha variables but is greater than 0.7 for some sections of the variables what does that mean thanks in advance

Hi list members Any easy way to get standardized cronbach's alpha for a scale, as in SPSS? Thanks Steve Powell proMENTE social research research | evaluation | training & consulting Kranj?evi?eva 35, 71000 Sarajevo mobile: +387 61 215 997 | office: +387 33 556 865 | fax: +387 33 556 866 Checked by AVG Free Edition. 17:44

Dear all, i need help about comparing 2 alpha cronbach. How to derive W statistic. Are alpha cronbach and Hoyt's method using ANOVA identical? Thank you for your help. Regards --------------------------------- Luggage? GPS? Comic books? [[alternative HTML version deleted]]

Estimado José, Es la segunda vez que veo te pregunta en este Foro, la primera vez se te pidió mas detalles y luego se te dio una respuesta. El hecho que reiteres tu pregunta, sin detalles y sin mencionar que es lo que no funcionó con la respuesta anterior, me hace recordar algunas recomendaciones que leí en una excelente respuesta en http://stackoverflow.com/, que trato de adaptar a

...ems) score.total<-score.total + x[,i] for (i in 1:n.items) var.items<-var.items + var(x[,i]) for (i in 1:n.items) z.score.total<-z.score.total + z.x[,i] for (i in 1:n.items) z.var.items<-z.var.items + var(z.x[,i]) var.total<-var(score.total) z.var.total<-var(z.score.total) cronbachs.alpha<-(n.items/(n.items-1))*((var.total - var.items)/var.total) z.cronbachs.alpha<-(n.items/(n.items-1))*((z.var.total - z.var.items)/z.var.total) return(cronbachs.alpha, z.cronbachs.alpha)} -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing lis...

.../(N-2)) * (1 -((sum(diag(var(xmat[,-b])))) / (sum(var(xmat[,-b]))))) Item.Mean<-apply(xmat,2,mean) Item.SD<-apply(xmat,2,sd) Item.Var<-apply(xmat,2,var) N.Cases<-rep(dim(xmat)[1],N) ITEM.STATISTICS<-cbind(Item.Mean, Item.Var, Item.SD,Item.Tot.Cor,Item.Rem.Alpha,N.Cases) Cronbachs.Alpha<- (N/(N-1)) * (1 -((sum(diag(var(xmat )))) / (sum(var(xmat ))))) Standardized.Alpha<- (N/(N-1)) * (1 -((sum(diag(var(xmat.z)))) / (sum(var(xmat.z))))) Total.Mean<-mean(apply(xmat,1,sum)) Total.Var<-var(apply(xmat,1,sum)) Total.SD<-sd(apply(xmat,1,sum)) N.Items<...

Erin Hodgess wrote: > Date: Mon, 05 Jun 2006 08:05:04 +0200 > From: Tom Backer Johnsen <backer at psych.uib.no> > User-Agent: Thunderbird 1.5.0.4 (Windows/20060516) > MIME-Version: 1.0 > To: r-help at stat.math.ethz.ch > References: <4481F48B.6090308 at imst.math.uni-magdeburg.de> > In-Reply-To: <4481F48B.6090308 at imst.math.uni-magdeburg.de> >

Dear Listers: I used cronbach{psy} to evaluate the internal consistency and some set of variables gave me alpha=-1.1003, while other, alpha=-0.2; alpha=0.89; and so on. I am interested in knowing how to interpret 1. negative value 2. negative value less than -1. I also want to re-mention my previous question about how to evaluate the consistency of a set of variables and about the total

Dear All, I am a novice in R and am working on my thesis for master's in Epidemiology & Biostatistics. While calculating Cronbach's alpha for the SF-36 questionnaire, I got all 8 of them more than 1. Is it possible to get alpha more than 1. If yes, please help me understand it. I read about the negative alpha value on your web postings. It does not answer my question though. Thank you.

...he score.items function in the psych package i find is too complicated (it requires a keys vector) and it doesn't report the "alpha if deleted" score. What have I missed when googling for an alternative? Thx in advance Andreas -- View this message in context: http://www.nabble.com/cronbachs-alpha---score.items%28psych%29-vs-reliability%28Rcmdr%29-tp21821595p21821595.html Sent from the R help mailing list archive at Nabble.com.

I am taking a behavioral stats graduate class and the instructor is using SPSS. I'm trying to follow along in R. Recently in class we started working with scales and survey data, computing Cronbach's Alpha, reversing values for reverse coded items, etc. Also, SPSS has some built in functionality for entering the meta-data for your survey, e.g. the possible values for items, the text of

Hi, What package would you recommend for analyzing the validity/reliability of multiple choice tests. Doing things such as classical test analysis, factor analysis, item response theory. I've used psychometric (item.exam), MiscPsycho (alpha.Summary), and ltm (rcor.test). MiscPsycho reported the numbers most similar to what I get in SPSS: corrected point biserial correlations,

Dear Kevin, In addition to the advice you've received, take a look at the survey package. It's not quite what you're asking for, but in fact it's probably more useful, in that it provides correct statistical inference for data collected in complex surveys. The package is described in an article, T. Lumley (2004), Analysis of complex survey samples, Journal of Statistical Software

jim holtman (jholtman at gmail.com) wrote: >It sounds like you want to use 'local' to create private variables: Hello, I hope I do not disturb your discussion very much writing in this thread but the topic sounded extremely familiar for me :) My only question is: Is there a good book or more general - any resources that can be used as a reader-friendly introduction to programming

Hello, I have a problem with the sizes of points on the screen (Code tested for some R versions on a Solaris system and also for Linux). Maybe it is best to start with an example: If I do a very simple plot using the character '.' for the points, e.g., n<-100; plot(0:n,0:n,pch='.',cex=1+(0:n)/20) then not all for all the points the horizontal and vertical dimensions are the

I'm new in both R and statistics. I "did my homework", I tried the archives and whatever I managed to get from the sources, but still I need assistance with the plsr package. I have a model with 2 core determinants D1 and D2, made by 3 indicators each (D1a,D1b,D1c and so on). Also I have 2 moderating variables (m1,m2), where m1 moderates D1 and m2 modarates D2. The dependent