I am planning to do an EFA of parenting variables from a literacy study. The data is nested (within classroom and intervention type).
I have a total of 90 variables that will be used in the EFA. Some are yes/no (coded 1 or 2), some are 1-7 Likert scale, some are 1-5 Likert scale, some are 1-3 Likert scale some are in minutes ranging from 1-720. Is it possible to run an EFA with this many types of variables? I have reverse coded everything so that is all in the positive (higher means better).
I think you are saying that students are nested within classrooms and that the intervention is given at the classroom level. If so, this is possible. I would rescale any continuous variables by dividing them by a constant to keep their variances between one and ten.
yes that is correct, although there were 4 different interventions groups and 1 control. Parents received parenting education in all, but what and how they received it differed depending on the intervention. I am not looking at intervention effects, so does the fact that the data is nested even matter?
How many classrooms do you have and what is the average class size? How many in each intervention group?
With a good number of classrooms, it would be of interest to do a TYPE=BASIC TOWLEVEL analysis to see what your intraclass correlations are. The EFA may be influenced by high icc's and there are two-level EFA alternatives.
The variables I am using come from 4 different sources. First is a parent interview (most of these are yes/no questions with some questions about how many hours/mins per day do you spend reading with your child, etc. I also have variables that were obtained via observations. Of those some are was this observed, yes or no. Others are on a 1-5 Likert scale (minimal to extensive). Others are number of times (1-7) a certain behavior was observed. All of these questions are related to parenting. Through the EFA, I want to be able to find out if there are any underlying factors among these 90 variables.
Mplus can carry out such an analysis, but EFA is really meant for a set of items that were developed to measure certain dimensions. It is used to confirm that the items measure the dimensions as intended. See the Topic 1 course handout on the website where using EFA is described.
I am planning to run an EFA as I have mentioned followed by a CFA. I am planning to use the same data set, just half for the EFA and half for the CFA. Is it possible to run both from the same data file or do I need to have separate files for the data for EFA and the data for CFA?
I have converted an SPSS file to .dat file. When I try to run Mplus, it says that one of the variables contains non-integer values. The data in SPSS is fine, but the .dat file has missing values in the last 4 variables. Am I doing something wrong when I convert the data? I am going to save as and selected tab delimited. I am unchecking write variable names to spreadsheet and I am choosing the variables to save.
I also tried saving as a .csv file. When I did this it had an error message that said non-missing blank found in data file at record #123, field #: 12. When I looked at the data, there is nothing missing?
You cannot have blanks in the data set and use free format. SPSS seems to use blanks as a certain type of missing. You need to change that. If you can't see the problem, send the input, data, output, and your license number to email@example.com.
It is not the SPSS data set you should be looking at. You should look at the data set named in the FILE option. All messages point to you reading the data incorrectly either by having blanks in the data set or by the number of variable names in the NAMES statement not being the same as the number of columns in the data set.