rumoursresearch.blogspot.com
Rumours of Research: Reviewers comment answers questions
http://rumoursresearch.blogspot.com/2013/08/reviewers-comment-answers-questions.html
Thursday, 8 August 2013. Reviewers comment answers questions. It was rejected. Well no real surprise there! However we got the reviewers comments back. What happened was one of the reviewers comments stood out. It suggested an analysis we had not done and this was after we thought we had analysed data every which way. We did it and the analysis popped out with the results just as we felt they should. No playing, no cludging, straight there in broad daylight. You see the reviewer had two things:. I work i...
rumoursresearch.blogspot.com
Rumours of Research: June 2013
http://rumoursresearch.blogspot.com/2013_06_01_archive.html
Thursday, 20 June 2013. When Dummy variables make sense. Back in early days of computers, most statisticians used to be dab hands at calculating dummy variables. It was a neat trick by which you could get a regression procedure to conduct an ANOVA! That have some nice properties like orthogonality. Which is actually very nice if you have a balanced design but of no particular use if you do not! This allows us to compare the difference that lies between good and normal and that which lies between normal a...
rumoursresearch.blogspot.com
Rumours of Research: December 2012
http://rumoursresearch.blogspot.com/2012_12_01_archive.html
Thursday, 13 December 2012. Not so Joined Up Thinking. Now what I should have done is considered the small number of people who do not fall into that groups. There are some postgraduate students who use departmental machines and there are about half a dozen support staff who have managed desktop because they are supporting students in the use of SPSS. That was a mistake. There are several solutions to this, you could open them all and export them or you can install the Legacy Viewer. Which allows you to ...
rumoursresearch.blogspot.com
Rumours of Research: August 2013
http://rumoursresearch.blogspot.com/2013_08_01_archive.html
Thursday, 29 August 2013. Using a standard Measurement Scale in a Survey within a fresh Population. There are a number of things you can do to check it. Firstly you can simply run a Cronbach's alpha, and if this fails then you know you are in trouble. If you want to be more thorough you can carry out a Confirmatory Factor Analysis (CFA), but what you should not do is just assume that ideas from one setting can translate unproblematically in another. Labels: confirmatory factor analysis. I should explain ...
rumoursresearch.blogspot.com
Rumours of Research: January 2014
http://rumoursresearch.blogspot.com/2014_01_01_archive.html
Thursday, 9 January 2014. Checking your work when using procedure (or watch out for * join). Now I know most people's data sets are relatively small scale, you are lucky if you have a hundred cases. However ever so often you get huge ones. We have them for things like computer usage within the department, Linguistics corpus data has them and I have a number of purchase transactions from a cafeteria. Most of the time when I merged files if there was a problem it was either:. Labels: large data sets. I wor...
rumoursresearch.blogspot.com
Rumours of Research: When Dummy variables make sense
http://rumoursresearch.blogspot.com/2013/06/when-dummy-variables-make-sense.html
Thursday, 20 June 2013. When Dummy variables make sense. Back in early days of computers, most statisticians used to be dab hands at calculating dummy variables. It was a neat trick by which you could get a regression procedure to conduct an ANOVA! That have some nice properties like orthogonality. Which is actually very nice if you have a balanced design but of no particular use if you do not! This allows us to compare the difference that lies between good and normal and that which lies between normal a...
rumoursresearch.blogspot.com
Rumours of Research: January 2013
http://rumoursresearch.blogspot.com/2013_01_01_archive.html
Thursday, 24 January 2013. Sometimes thinking visually is slow: PCA and Regression. I was in a discussion over planning a course on Statistics for Linguists where someone said they did not understand factor analysis and then went onto describe problems over how it decided what was important. The problem seemed to be all about scaling, I came away feeling oddly as if I knew the answer but I could not think of it. Friday, 11 January 2013. Fiddle Factors and Adjusting logged data. I have had a query on what...
rumoursresearch.blogspot.com
Rumours of Research: February 2013
http://rumoursresearch.blogspot.com/2013_02_01_archive.html
Thursday, 14 February 2013. Testing for Normality, Power and The Central Limit Theorem. So lets consider the often suggested approach of plotting a histogram of your raw data and then running a Kologorov-Smirnov test. This approach is WORTHLESS. There is no relationship between the normality of the original data and your tests unless there is nothing going on in your data. In other words if you have a significant result your raw data will not be normally distributed! Let me go back to the assumptions:.
rumoursresearch.blogspot.com
Rumours of Research: September 2013
http://rumoursresearch.blogspot.com/2013_09_01_archive.html
Wednesday, 4 September 2013. Slow Down and take Your Time. This will be a bit of a rant. I am used to people wanting everything done by yesterday! Let me be honest now a good analysis takes time. I know data collection is time consuming, I know that computerising that information takes skill but please do not think that you can then find your analysis in five minutes. Analysis takes time as well. Please if you have an analysis give it at least a month from final data entry to written reports! I work in r...
rumoursresearch.blogspot.com
Rumours of Research: October 2013
http://rumoursresearch.blogspot.com/2013_10_01_archive.html
Thursday, 10 October 2013. I am going to briefly put on my professional hat and repeat something that is clearly out there. Excel should always be used with caution. It annoys me that for graphs I often end up using Excel (I keep promising my self to learn a R Graphics package well enough not to). I do not use it for serious statistical analysis, and I do not use it for handling large data sets and here is why. However I equally do not like to use Excel for data handling. Into memory, yes that means the ...
