Jerry Miller

5 Questions 93 Answers 0 Followers

Questions related from Jerry Miller

Standard deviation or SEM?

I recently did an Analysis of Covariance (ANCOVA) where some test scores were adjusted for a covariate. The post-adjusted scores were about 2 points lower than the unadjusted scores. The...

12 October 2017 7,678 3 View

Repeated Measures ANOVA assumptions?

This issue came up recently in other questions and has me wondering about it. If you have sequential measurements of a continuous variable on the same subjects over time then you can do...

13 September 2017 9,529 10 View

Comparing Z-Scores or Actual Scores--which is best?

Is it better to compare Z-scores between two groups, or the actual (non-normalized) scores? Let's say I have reading scores from two schools, and these scores have had z-scores calculated,...

10 May 2016 4,650 3 View

Mixed ANOVA in SPSS: How should I handle missing data?

I want to run a Mixed ANOVA in SPSS. I have two levels of between-subjects factors (i.e., group membership), and eight levels of within-subjects factors (eight timepoints) at which subjects were...

01 June 2015 6,217 9 View

How do I get a p-for-trend?

I have IQ scores and various levels of a different factor that is presumed to influence IQ. Subjects' IQ scores (on average) are different at different levels of this factor. I can show that IQ...

26 January 2015 1,043 3 View