Essam A. Al-Moraissi

17 Questions 14 Answers 0 Followers

Questions related from Essam A. Al-Moraissi

Can we calculate the standard deviation from the mean, sample size and P value ?

Can we calculate the standard deviation IF the mean, sample size and P value are given ?

07 July 2018 8,372 1 View

How to perform certainty assessment in meta analysis study, when estimate effect analyzed by correlation or regression ?

To assess certainty of confidence in results of meta analysis, GRADE system used certain domains such as risk of bias, imprecision , indirectness and publication bias . However for those meta...

03 March 2018 10,265 0 View

What is the most current, reliable and adopted tool for causality assessment ?

To assess the relationship between risk factors and outcomes, we have to do an assessment , there are several scales or tools. what is the best and most flexible tool can be use for this purpose?

10 October 2017 819 4 View

What is the best and suitable statistical method/test to estimate a causal relationship between 2 categorical variable ?

To identify association between 2 variable ,( to assess if one factor cause another factor) Statistically, how can measure this relation?

08 August 2017 6,841 1 View

Regression or Correlation, what should to use?

To test an association between 2 quantitative variables , either computing correlations or regression,thus At what case we should use regression and avoid correlation. In other words, what is...

05 May 2017 5,081 21 View

What the single "best" metric/tool/indicator that could accommodate all facets to measure the reality impact and influence of journals ?

There are a different metrics to assess the importance and significance of scientific journals as Impact factor, h-index, Eigenfactor ,SCImago Journal Rank or SNIP ..etc. What is the current and...

04 April 2016 1,917 0 View

What dose it mean once the P value was greater than 0.05? Does this mean the null hypothesis is accepted ?

Once there were no significant differences and p value greater than 0.05 Does this mean the null hypothesis is accepted ?

02 February 2016 9,309 7 View

What is the best and reliable diagnostic method for inflammed keratocystic odontogenic tumors?

About, 40% of KOTs presented with inflammations. in this cases, aspiration and incisional biopsies would not give a reliable results. Its assume that the clinician should know a definitive...

01 January 2016 4,674 3 View

Differences between sensitivity, specificity, accuracy for any test or method?

Usually, We read this terms ;sensitivity, specificity, accuracy in literature to describing a diagnostic methods , I am confusing to imagine a meaning of this three terms. I need an example, how...

01 January 2016 5,106 1 View

Are there an differences between meta-regression and moderator-analysis?

Once there are an variables that could effect the results of meta analysis as follow up periods( variations). How can interpreted results of meta regression or do moderator analysis to identify...

01 January 2016 5,808 1 View

If we regress log (Y)= Risk ratio(Recurrence of tumor) against X (Duration of follow up in months), How interpret their slope and intercept?

In linear regression , I have been performing to identify the relation between risk ratio for outcome of tumors relapse and duration of follow up in months. The results were : Slope :-0.00015. P...

01 January 2016 4,941 7 View

What does it mean if P value is 0.000 ?

In meta analysis , When a P value is 0.000, is this mean its significant or not.

11 November 2015 2,808 1 View

When should use unweighted and avoid weighted variable and vise versa?

Are there an specific indications to calculate an weighted variable(mean or rate?

11 November 2015 6,801 0 View

What is the difference between weighted and unweighted variables?

which one is more accurate to represent an variable of populations? How to calculate an unweighted variables?

11 November 2015 962 2 View

Could be performed an meta analysis for uncontrolled studies?

Traditionally, the meta analysis perform between two groups (predictor variable) to identify which group or technique has better or worse than another but sometimes we need to assess an...

10 October 2015 7,592 2 View

How could be interpret an result of recurrence rate for an variable of proportion of 0.242?

After performing meta analysis for case series by using event rate or proportion, the overall result of all studies was 0.242, How could we present/interpenetration this result in my paper?

10 October 2015 8,316 0 View

Does Absolute Risk Difference has a superior meaning /preferred to Risk Ratio ?

At which conditions, risk difference is better to be used than risk or odds ratio or others effect measures?

01 January 1970 3,607 2 View