# power analysis

1. ### Multivariate Analysis of Variance

Hi all I am currently preparing my research for ethics submission but trying to establish an accurate sample size using G*Power. Apologies in advance if I do not explain this accurately and will try to simplify it as much as possible. I have three groups that will be determined based on...
2. ### Post hoc power analysis

Hi, I need to do a power analysis in G*power for my study. My research is part of a larger study for which the data is already collected, so my sample size is predetermined for me. I don't have access to the actual data yet. (note: I will be looking at a patient group and a control group...
3. ### Power analysis for moderated mediation (and a small research design question)

Hello guys! I am doing research on the effect of a specific medicine, quantified by dosage, on specific feelings (to be called; SF), mediated by feelings of connectedness, in which the relationship between the medicine and SF (X - Y) ánd the relationship between medicine and connectedness (X -...
4. ### Power Calculation

Hi, I have a power calculation question. I have an initial study that has 6 subjects (all treatment group) and a follow-up study with 60 subjects (randomized into treatment and placebo 1:1). Can I find the probability of any of the 60 subjects experiencing an Adverse event, if >=33% of the...
5. ### Pairwise Comparison Study Stats

Hi, I'm looking to carry out a study which will involve a pairwise choice comparison. I am aiming to identify any patterns of preference by wild individuals (measured by abundance) when presented with four different types of refuge. I will be conducting it in the form of pairwise choice...
6. ### power analysis/ sample size

Dear reader, I would like to conduct a clinical study in which I compare 2 treatments. The goal is to determine which one cures the lesion faster. There are currently no studies comparing these two treatments head to head but there are studies comparing them to placebo. According to the...

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8. ### Engineering Research, starting to look at statistics

Hey everyone, This will be my first post on this forum. I'm an engineering grad student and I have a little experience with statistics,but not enough to be able to do a sound analysis. I've completed my system design and will start looking at data collection. My primary aim is looking at...
9. ### Power analysis for time series regression

Hello, I'm trying to determine the sample size I need for a study. In the analysis, I will be including three predictors (score on a questionnaire, time, scorextime interaction) and one outcome variable. I am only using one group of individuals and collecting data at baseline, time 1, time 2...
10. ### Power analysis for 3-way interaction with 1 between-, 2 within-subjects factors

Hi all, I am trying to use G*Power 4 to compute the sample size that I will need to detect a 3-way interaction (2 x 2 x 2) in a mixed-effect ANOVA with 2 repeated-measures factors and 1 between groups factor. Do I just add the two levels of the second repeated-measures factor to the...
11. ### Sensitivity analysis said I wouldn't find an effect less than .8 but I did!

Hello! I ran a sensitivity analysis on G*power and it told me that for my independent samples t test (10 people per group, alpha = .05, power =.8) I wouldn't find an effect size smaller than d = 1.32. I then ran the t test and got a significant result with an d = 1.15 How is this possible?
12. ### Post-Hoc Power Analysis (G*Power) for simple linear regression

Hey everyone! I conducted a simple linear regression with non-significant results. Now I would like to analyze the power of this calculation using G*Power. I chose the option "F-tests - Linear multiple regression, fixedmodel, R(2) deviation from zero and entered 1 as my numer of predictors...
13. ### A priori Power Analysis

Hey Guys, I am a newbie and have a question on power analysis. I would like to measure the effect of an intervention on various measures and have several control variables. I believe it is the best to use a multiple linear regression model with a dummy variable for the treatment. Therefore, I...
14. ### power calculation for two groups (parallel)

Hi I have got 400 and 600 samples in control and test groups respectively. And in each of these two groups, i have an effect variable that occurs at the rate of 30%. this is a retrospective data analysis. I want to investigate whether the effect variable impairs the patient outcome (response...
15. ### help needed with Fishers Exact Test (power calculation)

Hello everyone. Hope someone can help me. I am running a Fisher exact 4 X 2 table analysis in SPSS. I have been informed its the correct test to use for the data. The problem is I have to conduct a power analysis to determine how many in both groups i need to be able to detect significance...
16. ### Power Analysis

Hi there, I am currently writing a statistics report which has to cover 2 questions: Firstly, what the correlation is between two different test scores of 30 participants. Secondly, what the power of the study is. I am really struggling to grasp what the pro's of doing a post-hoc power...