search for: cronbach

¿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 <- label.var(p04, "¿Prop...

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 más fácil y menos trabajosa label.cronbach <- label.var(p02, "¿Se enoja usted?") label.cronbach <- label.var(p03, "¿come mientras ve la TV?") label.cronbach <- label.var(p04,...

...ente 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 una pequeña muestra de ellos?¿por qué asignas a todas tus preguntas etiquetadas el nombre 'label.cronbach'? Hasta luego. 2013/9/27 Dr. José A. Betancourt B. <jbetancourt@iscmc.cmw.sld.cu> > > > > > > > ¿existe algún método en el cual no sea necesario hacer este trabajo y que > aparezcan los nombres de las preguntas? > > > > label.cronbach <- label....

¿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 <- label.var(p04, "¿Prop...

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...

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]]

...tentamente, Daniel Merino El 27 de septiembre de 2013 13:37, José A. Betancourt Bethencourt < josebetancourt.cmw@infomed.sld.cu> escribió: > ¿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...

...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 li...

A short function I wrote for the purpose of evaluating scales made up of a number of questionnaire items. It provides Cronbach's Alpha, both unstandardized and based on standardized items. It also provides item statistics which include item-total correlations (corrected) and item-removed alpha. Thought some of you might find it useful. I would also appreciate any programming tips or suggestions for improving the fun...

...-SpamReport: spamassassin found; -15 From is listed in 'whitelist_SA' > -9.0 Message received from UIB > -0.4 Did not pass through any untrusted hosts > 4.0 BODY: Probably more lottery > X-Virus-Scanned: by amavisd-new at stat.math.ethz.ch > Subject: [R] Significance test, Cronbach's Alpha > X-BeenThere: r-help at stat.math.ethz.ch > X-Mailman-Version: 2.1.8 > Precedence: list > Hi Tom! > > There is a package in R called "psy" > > One of the functions is "cronbach" Yes, and that function computes Cronbach's Alpha. > &...

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 evalu...

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. Sincerely, Dr. Smita Pakhale, MD McG...

...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 the question, etc. I haven't been able to find any survey guidance for R other than how to run the...

...e 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, cronbach's alpha. I didn't understand what the psychometric package meant by its "discrimination" and "item reliability" numbers output by the item.exam function. Perhaps the former is uncorrected point biserial correlations? They were higher values. I downloaded and inspecte...

...t r-project.org > Subject: [R] Primer for working with survey data in R > > 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 the question, etc. > > I haven't been able to find any survey guidance for R...

...;. I am ready to learn programming to use R efficiently. My problem is that I can prepare an expression that executes a sequence of specific commands, but I cannot figure it out how to make the commands conditional or looping to get what I really need. For instance, the example below calculates Cronbach's alpha (actually, I found more elegant way in the www, and even package psych that includes a function bringing identical results): alfa<-function(df) { not_empty_df<-df[ !is.na( df[ ,no_of_col<-length(vector<-c(1:(ncol (df))))] )==TRUE , ] no_of_variables<-ncol(not_empty_df...

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

...<- P["D1c"] Sp <- f1 + f2 + f3 Sp2 <- (f1 ^ 2) + (f2^ 2) + (f3^2) Sth <- (1-(f1 ^ 2)) + (1-(f2 ^ 2)) + (1-(f3^2)) D1_ICR <- (Sp^2) / ( (Sp^2) + Sth) D1_AVE <- Sp2 / ( Sp2 + Sth) but the results does not seem to give me something meaningfull. For example, while cronbach(cbind(D1a,D1b,D1c)) gives me > 0.90, the above computed D1_ICR gives me very low numbers (< .20). Also summary says % variance explained for X = 83.1 in 1st component while my computed D1_AVE is unacceptable (< 10%). Where I made it wrong ? Or it is just my data ? Any help will be much...