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Questions related to Advanced Statistical Analysis
I have two distributions that I want to test for equality. The objective of traditional hypothesis testing is to disprove a null-hypothesis which states a lack of difference (H0: the distributions...
08 August 2019 1,437 3 View
Dear Community, For my research, I would like to perform an interrupted time series analysis to test the effectiveness of an intervention. Regarding power, I read different information: on the...
08 August 2019 3,192 3 View
Let X1,...,Xn iid random variables with distribution F(p), where p is some parameter. Due to some reasons, p is not observable directly (in the sense that there is no way to confirm whether p is...
08 August 2019 8,757 18 View
In the attached forest plot, I need to extend the gap between 0 and 1. I also need to add scale break between 5 and 9. Unfortunately, I couldn't do this with graph editor (stata) . Does anyone...
02 August 2019 7,343 2 View
Hi, I have 13 survey items with the response options YES and NO. For example, the respondent may indicates YES or NO when asked if they have a reliable method of transportation. I would like to...
01 August 2019 3,952 3 View
Hello, I am hoping to get some suggestions about how to best organize some of my variables. Some background, my study groups subjects by the sports they play (6 sports total) and the outcome...
30 July 2019 7,520 5 View
For given samples X1...Xn, which follow the distribution F with parameters p1,...pm, one may use the maximum likelihood method to estimate p1,...pm. In the technical process, the method is only an...
18 July 2019 2,039 2 View
Hi! I have to compare relative survival (have 5-year estimates with SEs and patients number per group) across 3 time periods. Cannot use log-rank etc as (probably) it is impossible to operate with...
09 July 2019 2,979 5 View
I run a network meta-analysis. I try to run egger's and begg's test for different subgroups using these commands in stata: metabias logrr selogrr, egger by(treatment) metabias logrr selogrr, begg...
07 July 2019 3,760 6 View
07 July 2019 9,536 6 View
07 July 2019 734 6 View
I used AlphaSim (Voxel-level p< 0.01, 1000 iterations of Monte Carlo simulations with cluster-level p
28 June 2019 897 0 View
I have a model that simulates tuberculosis, with different classes for Mycobacterium tuberculosis, macrophages, lymphocytes etc. i can vary certain parameters (such as, percent of Mtb specific...
27 June 2019 7,730 9 View
I need to calculate HR and 95% CI for median survival rate in two different groups. i.e., Group 1: median survival=x and CI:(a-b) Group 1: median survival=y and CI:(c-d) I appreciate your help
25 June 2019 1,280 3 View
I am in the middle of questionnaire development and validation processes. I would like to get expert opinion on these processes whether the steps are adequately and correctly done. 1. Items...
17 June 2019 8,287 16 View
06 June 2019 6,905 4 View
Hello, My aim is to study how the inclusion of several risk factors improve a clinical model predicting the incidence of stroke in a survival analysis. I want to use the NRI to compare two models...
06 June 2019 6,248 4 View
06 June 2019 2,109 16 View
I am doing a meta-analysis of the validity of immunotherapy as a prognostic factor. Different studies report different categories for drug timing, making them difficult to combine. For example, if...
06 June 2019 4,520 1 View
Consider an experiment where an intervention X was manipulated and the behavioral outcome Y observed. After observing the outcome, a post-experimental questionnaire asked respondents about their...
27 May 2019 1,506 2 View
Suppose I am doing a Case control study. Lets say Group 1 is a clinical population (N=30), Group 2 is a healthy control population (N=30). I have measured various variables (Continuous data) in...
14 May 2019 3,576 10 View
The a, b, and c' paths are significant but the c path is not. What does this mean? I did bootstrapping and the indirect effect is within the confidence intervals and the intervals did not include...
05 May 2019 2,219 4 View
05 May 2019 4,785 2 View
I have a mediation model and have tested the effects of the model. My mediation variable does significantly and fully mediate the IV and DV. My question is can I test for significance between the...
29 April 2019 9,789 0 View