How to compute the correlation between a qualitative and a quantitative variable? My study is about the correlation of the person's gender and his or her score in a questionnaire about gender stereotyping. The higher the score in the questionnaire means he or she gender stereotypes more. What kind of correlation statistic should I use? Can I find it in Excel?
Correlations with unordered categorical variables I have a dataframe with many observations and many variables. Some of them are categorical (unordered) and the others are numerical.  I'm looking for associations between these variables. I've been able to compute correlation for numerical variables (Spearman's correlation) but :   I don't know how to measure correlation between unordered categorical variables. I don't know how to measure correlation between unordered categorical variables and numerical variables.   Does anyone know how this could be done? If so, are there R functions implementing these methods?
What is dependency injection? There have been several questions already posted with specific questions about , such as when to use it and what frameworks are there for it. However,  What is dependency injection and when/why should or shouldn't it be used?