control

Hi, I want to conduct a mediation analysis, which will investigate whether the change in depressive symptoms during treatment (time) is mediated by the change in OCD symptoms. Currently, I have time as my predictor, OCD symptoms as my mediator and depressive symptoms (at time t+1) as my...

Hi all, I was just wondering, how does a person determine the significance of a categorical variable in a hierarchical regression model if one dummy variable is significant and the other is non-significant? So basically, the categorical variable (X) I am examining has three levels, so...

Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and control group. My task at hand is to compare a certain variable between those two groups, which however is not appearing after the treatment...

I have the following scenario: - We want to send out an email blast to existing members to promote an upsell. - We are quite positive the email blast will increase the number of upsells, but we are interested in determining by how much. - So we want to keep a control group for...

Biomedical researcher here, trying to figure out how to analyze the results of a study on cell culture conditions. Three IVs were chosen: compound A (2 levels), compound B (3 levels), and compound C (4 levels). Cells were grown in microplate wells, 4 wells for each of the 24 permutations of the...

What test for significance is best to use to test the difference between the change of a categorical variable in a control group and the change in a pilot group? I do not think I can simply compare the 'after' for each because the 'before' for the two groups was statistically different - they...

hello everyone, I am in the process of designing an agricultural experiment in which I want to compare a series of variables between a group of manufacturers who use a mobile telephone app (n=15,000) is my treatment group and another group that does not (n=100,000) which is my control group...

Hi everybody, of course, I tried to find a thread with an answer about my topic. Unfortunately without success. I ran a multi regression analysis with 8 control variables and one explanatory variables to explain my dependent variable. The date is compiled between the years 1990 and 2000...

Two decision rules are given here. Assume they apply to a normally distributed quality characteristic and the sample size is n=5. Rule 1: The control chart uses the three-sigma control limits. If one or more of the next seven samples yield values of the sample average that fall outside the...

Very new to this statistics thing and could use some help deciding how to run the data for this. 60 participants (30 control/30 intervention). Each person is being given 5 different likert-scale assessments, oral cortisol swabs, blood pressure pre-test and post-test. I'm studying the effects of...

Hi there, Where (in which box) do I add control variables running a Manova (fit model) in JMP 9? Thank you gav

I want to compare a change in 2 experimental groups to the change in 2 control groups. So I have results for one sample, then retested among another indepedent sample, and was tested among a control group, then retested among a different control. For example, the 1st experimental group had a...