Andrés Fandiño-Losada

10 Questions 27 Answers 0 Followers

Questions related from Andrés Fandiño-Losada

What is the appropriate regression model for the analysis of the Visual Analogue Scale and other scales with floor and ceiling scores?

Dear Researchers. The Visual Analogue Scale (VAS), and other similar scales, has a floor and a ceiling score; e.g.: 0 to 100. Usually, these scales are analysed with linear regression models, but...

03 March 2017 7,963 3 View

Does someone know guidelines for establishing relevance and feasibility of a health research proposal?

Dear RG members. To write a successful research proposal is a difficult task. Does someone know guidelines or principles for establishing the following aspects of a Health Research Proposal?: 1....

08 August 2016 6,592 1 View

Is it mandatory to adjust for sample survey design when analyzing regression models from complex surveys?

Dear RG Members. I am using the Demographic & Health Surveys (DHS) data in a research about children's maltreatment. As you know, DHS data have a complex sampling design with strata and...

04 April 2016 9,763 3 View

How to calculate prevalence of a disease with missing data in the test of the survey?

Dear researchers. We are doing a study for estimating the prevalence of a disease diagnosed by a blood sample test. Some participants have answered the survey questionnaire but have refused the...

03 March 2016 4,403 3 View

What could you advise for controlling confounding in Structural Equation Modeling in Epidemiology?

Dear RG members. In epidemiological research, control of confounding is a core concept. Structural Equations Models (SEM) appear now as an alternative for epidemiological analyses. But, I could...

09 September 2015 6,662 2 View

What is the best way for modeling epidemiological time series data?

Dear RG members. Epidemiological research sometimes deals with time series count data as the dependent variable. But, what is the best regression model for these data? ARIMA has been the classical...

04 April 2015 5,708 8 View

How do I use multiple imputation procedures with factor analyses in Stata?

Dear RG Members, I am testing the factor structure of some psychological scales. The participants have some missing values in their items answers. Is it possible to use the multiple imputation...

03 March 2015 1,416 5 View

How can I do exploratory Factor Analysis and non-multivariate normal data?

Hello RG researchers. The theory says that data from items for Exploratory Factor Analysis (EFA) should have a multivariate-normal distribution. But I am working with Likert type items and their...

02 February 2015 5,333 9 View

Is it appropriate to include the clustering variable as a confounder variable in multilevel mixed models?

I am doing a study about an intervention targeting pupils of schools, in different cities. Thus, it is a multilevel structure and I am using mixed models for regression analyses. Contextual...

07 July 2014 4,528 3 View

Is there an alternative to the Cronbach's alpha for scales that have different numbers of items?

I would like to compare the psychometric properties of different instruments focusing on the same concept. But the instruments have different numbers of items. I am interested in reliability, but...

04 April 2014 6,564 36 View