Linked Questions

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0answers
3k views

Which test to use in a single group pre- and post-treatment analysis [duplicate]

I am attempting to analyse pre-existing data (using SPSS). I have one group of participants, 4 quantitative, non-parametric outcome measures, and am looking to see if there is a change in outcomes ...
2
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0answers
2k views

Experiment with two groups, pre- and post- treatment assessments [duplicate]

I am conducting an experiment with a control group and a treatment group. Both groups will take a pre and post treatment depression inventory. What statistical procedure do I use to determine if the ...
1
vote
1answer
911 views

Pre-post test with control group [duplicate]

Possible Duplicate: Best practice when analysing pre-post treatment-control designs I'm doing an action research study with 2 of my classes: 1 is the 'treatment' class and the other is the '...
0
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2answers
431 views

Help with pretest-postest data analysis [duplicate]

Possible Duplicate: Best practice when analysing pre-post treatment-control designs Is it acceptable to use ANOVA to analyze pre-test/post-test differences in two groups, or would it be better to ...
1
vote
1answer
388 views

Which statistical test to use using pretest and post test data? [duplicate]

I am trying to analyze data which there were two groups, control and treatment. Both groups were given a pre-test and post-test. The control group received differentiated instruction and the control ...
0
votes
1answer
76 views

Which test should I use for this? [duplicate]

I have two groups (A and B), observed on day 0 and day 7. On each group there are 10 observations. So 2 x 2 x 10 = 40 results on my dataset. I want to find out if the control factor between group A ...
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0answers
40 views

ANOVA, ANCOVA & covariates [duplicate]

so i am proposing to conduct a study on indirect contact as an intervention for stigma reduction in a police population. My IV is the intervention with two levels (intervention group and control ...
1
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0answers
33 views

Statistical test to use? [duplicate]

I am currently conducting a quantitative experimental research wherein 2 groups will be my participants. The research aims to determine whether or not Code-Switching is an effective tool to achieve ...
38
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8answers
37k views

Is it valid to include a baseline measure as control variable when testing the effect of an independent variable on change scores?

I am attempting to run an OLS regression: DV: Change in weight over a year (initial weight - end weight) IV: Whether or not you exercise. However, it seems reasonable that heavier people will lose ...
6
votes
5answers
2k views

Is statistical insignificance fatal?

I apologize if this question has been done to death, but as a non-statistician I really don't know what is the bottom line takeaway. I am looking at a sample of 30,000 individuals who were the subject ...
7
votes
3answers
5k views

Is it valid to use a difference score as an independent variable in a regression analysis

I would like to see if the difference in the number of BPD symptoms from baseline to follow-up two years later can predict psychosocial functioning at the 2 year follow-up. So I wanted to do a linear ...
4
votes
4answers
12k views

ANCOVA or repeated measures ANOVA?

I have 3 groups randomised to intervention A or B or control. Participants were measured pre and post intervention - should I use repeated measures ANOVA or ANCOVA with the variable measure at time 1 ...
7
votes
2answers
7k views

Do you include a covariate because of baseline group difference or if correlated with DV or both?

I am confused about the mixed advice regarding controlling for baseline differences. Would you always control for a baseline between groups difference on a particular variable or only if the ...
3
votes
3answers
13k views

How to assess differences between three groups in a pretest - posttest design using SPSS?

I have a dataset that includes one independent variable with 3 levels (group 1, group 2, and group 3) and a repeated dependant variable (pre test score, post test score). I am using the statistics ...
9
votes
1answer
5k views

Should the difference between control and treatment be modelled explicitly or implicitly?

Given the following experimental setup: Multiple samples are taken from a subject and each sample is treated multiple ways (including a control treatment). What is mainly interesting is the ...

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