search for: iasonas

Displaying 20 results from an estimated 31 matches for "iasonas".

2010 Aug 06
3
m-estimators
Dear colleagues can somebody help me by showing how we can compute m-estimators in R? thanks Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road...
2010 Jan 04
2
installation
...e to my students so that if they want to run R on their computer, they will be able to run it from the cd-rom without having to install it on their computer. That way, they can have a 'protable' R package installation in their bags, and they can use it on any machine. Is this possible? Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road...
2010 Jun 03
3
ordinal variables
Dear colleagues, I teach statistics using SPSS. I want to use R instead. I hit on one problem and I need some quick advice. When I want to work with ordinal variables, in SPSS I can compute the median or create a barchart or compute a spearman correlation with no problems. In R, if I "read" the ordinal variable as numeric, then I cannot do a barplot because I miss the category names. If
2010 Aug 20
3
Deviance Residuals
...it will be great. residuals(glm1, "response") residuals(glm1, "pearson") residuals(glm1, "deviance") residuals(glm1, "working") - especially this one confuses me a lot! What is the "working" option and how is this different? Thank you Jason Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road...
2010 Jun 06
3
prettyR
Hi all, does anyone have any practical examples of how this command can be used in prettyR? add.value.labels(x,value.labels) I mean, can we have the SPSS style of using numbers and/or labels if we want to? Thank you for your time Jason Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road...
2011 Jan 03
1
factor names
...es like "Engineer", "Doctor", "Teacher" etc. I would like to collapse those categories so that Teachers and Sociologists form one category named "Teach & Soc" etc. However, I do not know how I can do it. Recoding does not seem to work. Thank you Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford...
2010 Mar 24
1
ordinal regression
...iable/tested/trusted package for ordinal regression in the R world? 2. Also, I have a statistical question. What is the danger of having to many 'empty cells' in ordinal regression? How many empty cells are too many? Do you have a reference for me to read? Thank you for the support Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road...
2010 May 28
2
anova post hoc tests
Hi everybody does anyone know how I can run ANOVA post-hoc tests using R commander or R in general? Thank you Dr. Iasonas Lamprianou
2010 Dec 01
1
missing values
...the scores for each student. However, wherever there is a missing (NA) value, I cannot get the total score. How can I compute the total score and the average per question (a) by ignoring the missing responses, (b) by assuming that a missing response is a zero? Thank you for the response Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford...
2007 May 14
2
lmer function
...(Intercept) 14.30352 1.15870 12.34 GENDER[T.Male] -1.01776 0.06885 -14.78 Correlation of Fixed Effects: Warning in x$symbolic.cor : $ operator not defined for this S4 class, returning NULL (Intr) GENDER[T.M] -0.023 How do I interpert the results? Thanks for the help Dr. Iasonas Lamprianou Department of Education The University of Manchester Oxford Road, Manchester M13 9PL, UK Tel. 0044 161 275 3485 iasonas.lamprianou@manchester.ac.uk ___________________________________________________________ [[alternative HTML version deleted]]
2010 Aug 31
1
anova and lm results differ
...cntry:edf 24 4 0.4987 0.73672 Residuals 38754 3205 --- Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 Unfortunately, the results are different. Could anyone, please, explain why? Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road...
2007 May 02
4
upgrade to 2.5
Hi I am using R version 2.4.1. How can I upgrade to version 2.5 without having to install all the packages again? Thanks Jason Dr. Iasonas Lamprianou Department of Education The University of Manchester Oxford Road, Manchester M13 9PL, UK Tel. 0044 161 275 3485 iasonas.lamprianou@manchester.ac.uk ___________________________________________________________ now. [[alternative HTML version deleted]]
2010 Aug 30
2
Brown-Forsythe test of equality of MEANS
...butions (or so my textbook tells me). So, two questions: 1. Is there a function ready to use for calculating the Brown-Forsythe F*? 2. If not, what do people use for checking the results of a (one-way) ANOVA when there is non-normality as well as non-constant variances? Thanks, Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road...
2008 Jul 31
2
stats question
Dear friends, I am not sure that this is the right place?to ask,? but please feel?free to suggest an alternative discussion group. My question is that I?want to do a comparative study in order to compare the rate of incidence in two populations. I know that a pilot study was conducted a few weeks ago and found?8/140 (around 6%) incidence in population A. Population B was not sampled. Assuming
2012 Jan 08
2
multivariate problem
...ationship between these variables changes? For example, if DayX is such a strange day, factor analyzing the data before DayX and after DayX separately would give me different factors (princial components). But how can I identify such a daym without trial and error? Thank you for the help...   Dr. Iasonas Lamprianou Department of Social and Political Sciences University of Cyprus [[alternative HTML version deleted]]
2010 Sep 10
1
Standardized logistic regression coefficients
...s some sort of standardized logistic regression coefficients widely accepted by the community? 2. Also, if anyone knows, how can I implement this interquartile-range odds ratios of the Design package? I checked on the manual and found no reference to interquartile-range odds ratios Thanks Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road...
2007 May 11
1
Anova
...ariance analysis? For example, I have the score of pupils on a test. Each pupil belongs to a school and within each school I may have several classes? How can I estimate the variance of the pupils, schools, classes and the errror variance? Any examples? Any help will be appreciated. Jason Dr. Iasonas Lamprianou Department of Education The University of Manchester Oxford Road, Manchester M13 9PL, UK Tel. 0044 161 275 3485 iasonas.lamprianou@manchester.ac.uk ___________________________________________________________ now. [[alternative HTML version deleted]]
2011 Jul 31
2
zero truncated poisson regression
Dear friends, does anyone know how I can run a zero truncated poisson regression using R (or even SPSS)?   Dr. Iasonas Lamprianou Department of Social and Political Sciences University of Cyprus [[alternative HTML version deleted]]
2012 Jan 12
2
kruskal wallis post hoc?
...cted all pairwise comparisons and found no significant results. Could anyone please give me a hint as to why this happens or redirect me towards a specific web page where I can find more info? (I used alpha=5% and made no bonferroni or other correction for the pairwise comparisons) Thank you   Dr. Iasonas Lamprianou Department of Social and Political Sciences University of Cyprus [[alternative HTML version deleted]]
2010 Sep 19
1
ergm crashes
...rk mesa <- faux.mesa.high plot(mesa) summary(mesa) plot(mesa, vertex.col='Grade') legend(?bottomleft?,fill=7:12,legend=paste(?Grade?,7:12),cex=0.75) fauxmodel.01 <- ergm(mesa ~edges + nodematch('Grade',diff=T) +nodematch('Race',diff=T) ) summary(fauxmodel.01) Dr. Iasonas Lamprianou Assistant Professor (Educational Research and Evaluation) Department of Education Sciences European University-Cyprus P.O. Box 22006 1516 Nicosia Cyprus Tel.: +357-22-713178 Fax: +357-22-590539 Honorary Research Fellow Department of Education The University of Manchester Oxford Road...