In longitudinal data, how do we interpret the non-significant correlation between two same variables (Stress t1 & Stress t2) in paired sample t-test?

In paired sample t-test, is it possible that the correlation between two same variables (for example, Stress time 1 and Stress time 2) is not significant. What could be the possible reasons for...

08 September 2014 8,008 4 View

To perform a hierarchical multiple regression, what method should I select Enter or Stepwise?

03 April 2014 7,710 2 View

What is the acceptable range of skewness and kurtosis for normal distribution of data?

It is desirable that for the normal distribution of data the values of skewness should be near to 0. What if the values are +/- 3 or above?

03 April 2014 1,976 96 View

Can anyone help with the interpretation of correlation (r) in paired sample t-test?

In a SPSS for pair sample t-test, how do we interpret (r)? For example, we have the data of same individuals on two time points (stress time 1 and Stress time 2) and the value of (r) is...

03 April 2014 5,530 8 View

How can we statistically control the effect of some variable while using SPSS?

Is it possible to statistically control the effect of some variables. for example in regression analysis, while seeing the relationship of predictor and outcome variable, we want to control the...

11 December 2013 6,367 20 View

Can anyone advise me on statistical analysis for a longitudinal study?

I am doing research with disaster victims and seeing the changes in psychological distress and trauma response across time. The data is aimed to be collected at three waves/time points with the...

10 November 2013 2,859 13 View

Psychological treatment of Somatization disorder - can anyone help?

What is considered the 'treatment of choice' for somatization disorder?

09 October 2013 5,839 15 View

A child grinds their teeth and clenches their jaw during sleep. I am interested to know the psychological cause and its management.

Reasons for children's grinding and clenching of jaw during sleep.

31 December 2012 9,467 27 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

Do we need to write protocol for a second study of a systematic review that has been registered and published?

I have conducted and published a systematic review and meta-analysis research with the topic related to public health and health pomotion (protocol was registed in PROSPERO). Now we want to...

03 March 2021 8,920 3 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

1. What is the impact of having different scales in a survey? and how can we solve this problem before and after data collection (Literature)?

1. What is the impact of having different scales in a survey? and how can we solve this problem before and after data collection (Literature-based reflection)? Thank you for your time and for...

03 March 2021 2,870 3 View

What degree of missing data in a particular case/participant results in Expectation-Maximisation no longer working?

I'm dealing with a mediation model and am using the PROCESS module in SPSS. Due to SPSS and PROCESS being limited in the imputation methods - being unable to handle multiple imputation - the other...

02 March 2021 4,362 1 View

Do I need to do linear regression before running mediation analysis using PROCESS MACRO by Hayes ?

I just wanted to check if I need to run a linear regression separately if I am using PROCESS MACRO to run mediation analysis. Thank you.

02 March 2021 4,359 3 View

Sample dilution for quantitative analysis using ELISA?

If the detection range is in ng/ml but the reference range is in ug/ml for a molecule or protein in serum or plasma .how to dilute and what is the initial volume to be taken for quantitative analysis

02 March 2021 7,670 3 View