Advanced Statistical Analysis

Contact experts in Advanced Statistical Analysis to get answers

1,265 views 1,677 posts

Questions related to Advanced Statistical Analysis

Appropriate statistical test for my data?

I need to analyse some data in IBM SPSS statistics 21. I'm a novice to statistical testing and hope someone could enlighten me. Research is looking into the relationship between breed size and...

23 April 2019 5,044 6 View

Which interrater-reliability should I use for my study (ordinal data)?

Hello! I made a small post mortem computed tomography study on 5 corpses with 5 different scan protocols to evaluate the "best" protocol (=best image quality) for a native cardiac examination....

17 April 2019 8,474 1 View

Does anyone know how to implement restricted permutations for multivariate analysis of split split plot experiments in R?

I wish to analyze the effect of tillage, nitrogen and cover crops on weed communities. The design can be described as the following: - 4 blocks - main plot factor: tillage (nested in blocks) -...

04 April 2019 6,012 1 View

What is a good statistical approach to determine whether there are specific vulnerable time periods during childhood in regards to childhood abuse?

We have collected retrospective data on different forms of childhood abuse adult patients, as well as current physical and mental impairment. The questionnaire on childhood abuse included a...

04 April 2019 8,250 6 View

In Hayes' process Model 1, what does it mean if the conditional effect of moderator is partially effective?

Hi, I am doing my research using Hayes' model 1, simple moderation. I got result that the moderating effect is significant, however, I don't get the meaning of this one below: Conditional...

04 April 2019 6,105 1 View

What factors are important in the design of response surfaces?

It is required to know the important factors to consider, when designing response surfaces. Examples of response surface designs with levels of fertilization in wheat. Software for this type of...

04 April 2019 3,602 2 View

How to find the percentage difference between two groups from a Mann Whitney U Test?

Hi, I am conducting a Mann Whitney U test to compare CTX (biomarker) scores in athletes vs control groups. Although I have found no signifcant difference, I am still looking to make a statement...

04 April 2019 8,632 6 View

How to obtain an Optimized equation based on the data?

I'm trying to obtain an optimized equation such as A as a function of (B,C,D,E), but I'm not knowing where to start with and how to use Matlab to obtain the coefficients for B,C,D,E. The below...

04 April 2019 6,285 3 View

When Cronbach Alpha should not be used as a method to test consistency?

Hi, Several studies have used Cronbach Alpha to test the consistency between the groups of Likert Scale surveys. I have doubts that some of these studies have made a mistake by using this method...

04 April 2019 3,929 3 View

Does anyone know how to implement restricted permutations for multivariate analysis of split split plot experiments in R?

I wish to analyze the effect of tillage, nitrogen and cover crops on weed communities. The design can be described as the following: - 4 blocks - main plot factor: tillage (nested in blocks) -...

03 April 2019 4,383 1 View

How to calculate probability of bacterial colonies found within a specified area?

We are aiming to isolate bacteria using membrane filtration. I would like to test for the probability of bacterial colonies growing towards the center of 47mm diameter membrane vs growing at the...

29 March 2019 9,904 2 View

How to calculate probability of bacterial colonies found within a specified area?

We are aiming to isolate bacteria using membrane filtration. I would like to test for the probability of bacterial colonies growing towards the center of 47mm diameter membrane vs growing at the...

03 March 2019 9,068 3 View

Hello everyone, Could you please help me find the best way to analyze my data?

Hello everyone, Could you please help me find the best way to analyze the following: my outcome is the rate of cognitive decline measured by the difference between two iqcode scores ( iqcode at...

03 March 2019 4,006 5 View

Can you use a t-test instead of an ANOVA in a multi-factorial design if you're interested in only one comparison?

Hi, I have a question about statistical analysis, specifically ANOVA and the paired sample t-test. I’m currently preparing an experiment, in which I will measure RTs in a task that involves...

26 February 2019 9,342 4 View

What does it mean by "the point when the trend of the data stabilizes to approximate a straight line"?

I wanted to check the completeness of an earthquake catalog. I saw the paper "Probabilistic Seismic Hazard Analysis for Rock Sites in the Chennai City" by G. Kalyan Kumar and it used the Visual...

02 February 2019 6,210 8 View

In time series data, is it sensible to compare the AUC of the extrapolated baseline and observed post-intervention outcomes?

I am (prospectively) evaluating a NHS health board wide quality improvement initiative aiming to reduce exposure to high-risk prescribing. I am expecting a time lag in the intervention effect, but...

02 February 2019 2,430 2 View

Quantify the number of community types from a large data set?

Hello, I have a large data set which consists of ~24,000 identified beetle specimens, which were collected weekly over the course of a few weeks at a dozen sites. My goal is to quantify how...

02 February 2019 6,537 5 View

How to include data for meta anlaysis in cases where z-scores are given for outcome variables?

i would like to ask while retrieving data from the research papers, what we should do with research articles where the treatment and control mean(SD) values are reported in z scores and not in...

22 December 2018 7,258 1 View

Comparison of ODDS ratios of two different samples?

I want as part of my job, research the faceturs associated with HIV in 2015 and 2017 and compare the odds ratio over these two periods. My concern is that the sample is not the same. I would like...

20 December 2018 8,685 16 View

Is there any method to make clusters other than C mean clustering?

12 December 2018 511 8 View

How to include data for meta anlaysis in cases where z-scores are given for outcome variables?

i would like to ask while retrieving data from the research papers, what we should do with research articles where the treatment and control mean(SD) values are reported in z scores and not in...

12 December 2018 4,658 1 View

Standard deviation of ratios, reciprocals, subtraction, etc.?

I have 2 variables (x and y) and an independent variable (z). I have the experimental data for x, y and z in the form of mean and SD. The equations that I am trying to fit my data in are a bit...

11 November 2018 3,048 2 View

Is there an existing closed form expression for the Expectation of the SNR for ZF precoder over spatially correlated Rayleigh Fading channels ?

Although closed form expressions for the SNR of ZF precoder oved iid Rayleigh channels exist (yet complicated ones), I can't find in the literature closed form approximation to the SNR of ZF in...

11 November 2018 7,354 0 View

Is it allowed to calculate a means-value and standard deviations of a Correlation R² ?

Hi there, I need a bit help in statistics. I developed an analytical method, which relies on calibration curves. For calibration, the measured signal value of a calibrator is plotted against...

11 November 2018 398 7 View

Badges
Science topic