Emilio Pariente-Rodrigo

13 Questions 55 Answers 0 Followers

Questions related from Emilio Pariente-Rodrigo

Post hoc test for a contingency table NxN?

When I run a contingency table NxN and I get a significant result with the chi-square test, is there a post-hoc test in SPSS to address the comparisons? Or should I run logistic...

02 February 2017 3,259 1 View

Is it correct to use Cronbach´s Alpha to assess the internal consistency of a questionnaire with binary data (yes/no)?

Dear All I have a questionnaire with 9 items and binary data. After running a factorial analysis, I have discovered 4 principal components and I want to assess the internal consistency in each one...

02 February 2016 6,005 9 View

Inverted T waves in V4-V6 in an asymptomatic black athlete: genetic test?

Dear All I have a patient, african-american professional sportsman.Asymptomatic, in a pre-participation screening, ECG was abnormal, with minor inverted T-waves in V4-V6 leads. There are neither...

11 November 2014 9,170 0 View

Intraclass correlation coefficient when data are not normally distributed?

I am using SPSS and my model is: 3 raters, two-way mixed effects, absolute agreement. Data are far from normality, I do not know a non parametric procedure and I do prefer not to categorize the...

11 November 2013 267 9 View

How to test multicollinearity in logistic regression?

I want to check multicollinearity in a logistic regression model, with all independent variables expressed as dichotomous. Given that I can not use VIF, is the correlation matrix the only...

09 September 2013 2,416 22 View

Internal validation of a regression: cross-validation?

I am interested in developing a split-sample technique to assess the internal validation of a logistic regression. Many statistics have been used to compare both groups, training sample and...

07 July 2013 5,101 14 View

How can we check the possibility of a bias when we do a log-transformation?

There is a general trend to do log-transformations when we face skewed and non-normal distributions. However, it is quite unusual that the authors assess the (real) possibility of having biased...

06 June 2013 4,974 4 View

From a statistical viewpoint, in a linear regression model, is it better to have a policotomical independent variable than one in a continuous form?

I want to know the influence of HRQOL on the utilization of primary care services, in a multi-adjusted linear regression model. In order to assess the five dimensions of EuroQol-5D as an...

06 June 2013 4,806 4 View

Matching by age or to include age in the model?

If we want to adjust by age in a case-control study, we could do a matching 1:N by age (conditional logistic regression) or just consider age as another covariate in the model, without a matching...

06 June 2013 9,747 1 View

Validation of a regression model

I have conducted a no-conditional logistic regression analysis to know the relationship between spine osteoarthritis and vertebral fracture in males over 50 years. The validation of the model has...

06 June 2013 6,238 2 View

Do you think the log-transformation of a covariate has become a sacralized tool?

Sometimes it is not useful at all, specially in very skewed distributions, with many values=0. We don´t get the normality, and the problem goes on. Moreover, it seems "going downstairs" to use a...

05 May 2013 8,793 2 View

About the validation of a conditional logistic regression model with CoxReg (SPSS): must it be done with the analysis of residuals of Cox?

I have developed a case-control study, matched 1:2, and I have addressed the conditional logistic regression analysis with COXREG (SPSS), via recode. The model runs OK (confirmed with Stata). My...

05 May 2013 1,745 0 View

Is the procedure of Holm better than Bonferroni´s correction as a method of adjustment?

In a multivariate analysis, the adjustment of level alpha with the method of Bonferroni may lead us to a type II-error.

05 May 2013 8,376 2 View