Rukman Mecca Manapurath

13 Questions 9 Answers 0 Followers

Questions related from Rukman Mecca Manapurath

Levels or concentrations in case of serum vitamin?

Which term is more appropriate when discussing vitamin B levels or concentrations in serum, considering that the terms "levels" and "concentrations" are often used interchangeably? Thanks in advance.

17 March 2023 8,940 2 View

GRADES certainty of evidence observational studies ?

In case of systematic reviews or meta-analysis involving observational studies (of exposure), can we do GRADES certainty of evidence through GRADES PRO? Or is it just low quality by default? Here...

25 November 2021 846 4 View

Can we take estimate from Individual participant data (IPD) meta-analysis to conduct a newer meta-analysis?

For instance if we are studying mortality associated with a drug, and there are 15 studies with the outcome but we need only a subset of the population studied by them. If 5 studies were included...

19 September 2021 3,832 3 View

Which is the appropriate post estimation command for survey data analysis in Stata ?

I am doing survey data analysis using svyset command. I would like to see if collinearity exists between any independent variables used in the regression analysis, which is the post estimation...

19 December 2020 5,808 3 View

How the data is to be structured for Random effects meta analysis in Stata 16.0 (for Risk Ratio)?

From a big data, what are the steps to generate a dataset for doing Random effects meta analysis in Stata software? Thanks in advance.

14 December 2020 3,635 4 View

If one of the column value is zero, taking fishers will help for association?

If one of the column value is zero, as shown in the screen shot below, taking a fishers exact will be good for association or is it better to combine values and do analysis? Thanks in advance

05 March 2020 9,764 3 View

If we can’t find sensitivity of a test, mentioning risk ratio for the test will be good?

I was searching for sensitivity and specificity testing for apoB. But I couldn’t find reliable references. But Relative Risk Ratios (RRR) for apoB is available. Mentioning RRR will be a surrogate...

25 February 2020 9,840 2 View

How to determine cut off value for a test ?

For instance if the body fat cut off is based on some western standards, how can we determine cut off for our study, based on the study results? ROC curve?

27 January 2020 5,463 2 View

How to calculate Confidence Interval range from a sample proportion?

Given the sample size, how can we calculate the sample confidence interval range values to know the upper and lower limit of sample size? Thanks.

23 September 2019 6,721 2 View

If we presume prevalence of a less studied event to be 50% and later the study result shows actual prevalence to be 16%, how to justify this?

Presumed prevalence was 50%, as parent study in the region, but actual prevalence was 16%. Does this much of difference makes my calculated sample size wrong? Thanks in advance.

21 September 2019 438 7 View

Can someone explain the interpretation of F-adjusted test statistic in "svylogitgof" command output in Stata 14?

PFA the word file of the output I received and command used. Context:- Secondary data analysis of big survey data Logistc regression for prediction of output (binomial)

01 January 1970 8,604 1 View

Heterogeneity in Systematic review - difference in study population

Consider the following example - If I am studying (Systematic review and meta-analysis) the catch growth among preterm babies, all the included trials studied singleton pregnancies but one of the...

01 January 1970 6,096 4 View

Newcastle-Ottawa Scale or ROBINS-I or ROBINS-E

For a systematic review with nonrandomized studies exploring the effect of an environmental exposure, which tool is preferable?

01 January 1970 3,581 4 View