Questions tagged [control-group]
In a comparative experiment a control group is one which does not receive the active treatment
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How can I compare the average change between two unpaired groups?
I have two groups of participants, a test group and a control group, both of whom have completed pre/post activity surveys. For the test group, I can match their pre and post surveys to get change at ...
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Can I use Welch’s t-test? Are the data independent? and is running a test viable without a control?
I am evaluating whether there is a statistically significant increase in a discrete count of a specific incidence per patient between two independent cohorts
e.g. patient_1 had 4 incidences of a ...
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Statistical analysis for 2 measures in intervention group and 1 measure in control group?
I have to analyse the results of an intervention research where 3 dependent variables were measured with questionnaires. Participiants were randomly assigned to intervention and control groups. In the ...
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Modeling disease vs. microbiome: which should be the outcome?
I have a question related to microbiome research, an area where many researchers assess whether taxa abundances differ between disease and control groups. I often see statistical models where taxa ...
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How to determine the treatment time for untreated in difference-in-differences design
I'm estimating the effect of treatment initiation on health outcomes using a Difference-in-Differences (DiD) design. The timeline is defined relative to the treatment date, not calendar time. For the ...
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Adding a control group to a 2x2 Anova
I am conducting an experiment with 2 factors in which participants will be provided feedback regarding a task. Factor 1 is valence (positive or negative), and factor 2 is feedback detail (low vs high)....
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How to handle dependent effect sizes in meta-analysis with a single control group?
I am conducting a meta-analysis and need advice on extracting effect sizes from studies where multiple treatment groups are compared to a single control group. Specifically, I am dealing with standard ...
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Difference-in-difference age groups
I would appreciate your help with a question I have.
I'm creating a Difference-in-Difference study to examine how a conditional cash transfer to individuals 18 years of age to be spent in sport ...
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Binomial test to establish a pass criterion
I'm sorry for the following -probably- stupid question.
I'm performing a psychological experiment and I have no idea about how to establish how many control items one has to pass to be included. My ...
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Performing a Difference-in-Difference Analysis where the Control Group is Already Treated
I'm involved in a project where the outcome is the proportion of cancer patients who have received surgery. The treatment event is a state-level policy change that mandated moving all these cancer ...
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Is mutual exclusivity important for an A/B test for an audience selection method?
Say I want to measure whether a set of business rules is better than random at identifying customers most likely to respond to an email. The steps are:
Take the entire population of 200 people and ...
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Propensity score matching for differently sized control and treatment groups
I would like to use propensity score matching to construct a post hoc control group to accompany a pre-determined treatment group.
Some literature I am seeing says that I should pairwise match sample ...
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RCT with repeated measures help [closed]
I may be overthinking this and going down too many rabbit holes of possibilities, but can someone please help me figure out the appropriate ("best") method to use for this research project?? ...
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Baffled by Rubin's Potential Outcomes RE: What Would Have Happened?
Background
Seeking a clear and authoritative explanation of a key concept of Rubin's Potential Outcomes Framework that is causing this hapless OP enormous grief. While the necessity to distinguish ...
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Repeated measures - sort of?
I do mostly econometrics but am faced with a repeated measures type sample. I can solve it as a regression with dummies, but feel like I'm losing information in the repeated cases. I know the medical ...
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