Hello everyone, I am doing an online survey through online panel of Amazon Mechanical Turk. how I can find a sample size formula not to be old?

I used Cochran (1963) sample size formula, but as it shows it so old and my advisor asks for some new references for finding an appropriate sample size.

01 February 2021 8,275 4 View

Does anyone know any article on free convection heat transfer from an oblate with uniform heat flux?

Does anyone know any article on free convection heat transfer from an oblate spheroid with uniform heat flux? All articles I've found are about isothermal oblates.

14 December 2020 1,163 4 View

How can I simulate electroporation for a bilayer?

hi I am trying to simulate electroporation for a bilayer containing 10% cholesterol on GROMACS. I have read lots of articles but the only parameter that they have talked about was the electric...

15 November 2020 7,602 2 View

How can I correct my electrostatic potential figure to be symmetric?

hi. I have done electrostatic potential analysis on a symmetric bilayer contains 10% Cholesterol but I've got this figure and I thought there is a problem with that as the potential is not...

09 November 2020 7,137 1 View

How should I make an index for gangle in GROMACS?

Hi. I'm analyzing a bilayer and I want to make an index for calculating tilt angle. my problem is I have no idea about how to create such an index which contains vectors in it. I would be...

01 October 2020 9,021 1 View

How can I build a DMPC bilayer contains certain numbers of Cholesterol molecules on GROMACS?

Hi. I'm new to GROMACS and I want to simulate a DMPC bilayer contains 8 Cholesterol molecules. But I have no idea about how to add Cholesterol molecules to my simulation box.

07 July 2020 5,699 1 View

How can i resolve the size of nested-multiplex pcr?

Hi there, I have a problem to get a conclusion in my PCR results. I have nested-PCR product in which the first run size is what i expected to be. However, the second run is ~100nt larger than...

21 September 2018 3,901 5 View

How to optimize periplasmic protein expression in E.coli (BL21)?

I want to optimize protein purification. My protein is expressed in periplasmic space of E.coli. I particularly want to know what is the routine protocol for these kind of proteins. Is it 1mM...

16 July 2017 5,042 7 View

Whats are the usage of isochornal annealing of metalic glass?

13 May 2017 1,335 2 View

High power density for the Pt/C cathode?

09 September 2016 2,316 1 View

Binary Logistic Generalized Linear Mixed model in SPSS. Is it doable?

I want to analyses the proportion of swimming sperm of three species of fish in two salinities. To analyse the proportion of swimming sperm in a Generalized Linear Model, I would use a Binary...

03 March 2021 2,297 3 View

What test should i use in comparing the correlation between categorical and continuous variables?

Dear all, I have the variable (Surgery duration) represented by values in minutes and the variable (preoperative neuropraxia cases) represented as (Yes/No) values. I want to compare these two...

03 March 2021 5,427 5 View

Logistical regression using SPSS for a dichotomous dependent variable, with an independent variable of 1, 2, 5 and 10 seconds?

I have an experiment with 28 participants The independent variable is the times 1, 2, 5, and 10 used as the cross hairs during a task These 4 times were tested using 4 different blocks, each...

03 March 2021 9,692 2 View

How to find the mean, SD and CI in SPSS?

Hi, I hope that someone can help me with this task: I have 5 groups of participants which are numbered in SPSS from 1 to 5 (according to their group number) and are all under the variable group....

03 March 2021 506 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

How to code open-ended questions in SPSS?

Hello all, In SPSS I am going to code 2 open-ended questions. I have already read all the answers and I made a list of the most important categories to which I can code the answers. This question...

02 March 2021 1,757 4 View

The procedure compute?

02 March 2021 5,204 3 View

Does anyone know what a '.' means in SPSS?

Hi everyone! I was wondering if anyone would be so kind as to help me with regards to my data set on SPSS! I was checking for multivariate outliers via the standardised residuals ('Linear...

02 March 2021 7,910 3 View

How to calculate BREQ 3 questionnaire?

how to calculate BEHAVIOURAL REGULATION IN EXERCISE QUESTIONNAIRE BREQ 3 ,which contain 24 questions and each question has 5 answers (0- Strongly disagree , 1-disagree, 2- Neither agree nor...

02 March 2021 811 3 View

What SPSS analysis should I run with one IV (with two levels) and two DVs?

Hi, I am trying to figure out which test would be most appropriate to run for the following question: Is there a difference in task blood pressure between smokers and non-smokers? There are two...

01 March 2021 8,235 2 View