I am writing an article critique as part of an assignment on an article titled
I am more of a starter in statistical analysis and hence the question. There is a section in the paper titled "Statistical Analyses" in which the author talks about meeting the assumptions of ANOVA. The authors have tested for normality, homogeneity of variances and independence between data collected is assumed. However the author has not mentioned about the 4th assumption of checking if the mean of the residuals are zero.
1) Is this a slip on the part of the authors or is that tested when you draw mean value plots with standard error as they have done in the paper.
My second question is regarding the linear discriminant analysis done in the study. The authors have done an ANOVA to compare between the chemical components of different pheromones and listed the results in a table. I have not used a linear discriminant analysis before, hence,
2) Could you please state why the authors have done a linear discriminant analysis?
3) Also, I am guessing that we use ANOVA for comparison since the comparison is between categorical variables. Is that a correct assumption for this paper?
Any comments please