In my current analysis, I have not found statistical significance to some of my conditions. So I was wondering how to predict or calculate the effect size with more subjects and items. I have 20 subjects and each have taken 120 items. My dependent variable is Reaction Time (RT) and my independent variables are Related (2 levels -- control and experimental) and PrimeType (5 levels). In testing significance, I look at RT significance of Related for each Prime Type level. For example, the significance level for PrimeType 3 when compared in RT between Related yield a p-value = .075
So I wonder what packages or functions that I could use where I put in the current observation numbers and significance level and compare it or calculate it with a bigger sample. I want to check whether the the significance level would change or become statistically significant in a bigger sample size.