Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [treatment]

37 questions
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Dynamic treatment timing in a panel-DiD framework

I have a question regarding the timing of treatment effects and how one could use the difference-in-difference estimator on a panel data set. Let me begin by saying that I have a big firm level unbalanced panel dataset with large N (7000-ish), small…
Billywob
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Difference ATE and ATET?

I have some problems understanding the difference between ATE and ATET and the Selection Bias. To explain what my understanding is I have done the following representation so you can correct me: We want to see the effect of taking LSD, to do so we…
adrian1121
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How to chose covariates to adjust for in a regression analysis

I am running a regression analysis where my primary interest is to see if the outcome differs by the group (treatment vs. control). However, I have some 80 other clinical and socio-demographic variable that could potentially contribute to the…
curiousmind
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How to deal with dropouts from a waiting list control group?

Many treatment studies compare a treatment group with a waiting list control group, for example to adjust for spontaneous remissions. Unfortunately, many more participants drop out from the waiting list control group than from the treatment…
user14650
3
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1 answer

Average treatment effect on the treated

There is something conceptual I don't understand with average treatment effect on the treated. Say you have two binary outcomes $Y_i(W_i)$ in which $W_i$ is either 0 or 1 (treatment). So I either observe $Y_i(1)$ or $Y_i(0)$. What I am not sure I…
Daniel Nathan
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In a RCT, what are the risk of selection bias if no allocation bias is present?

In the Wikipedia page about Randomized Controlled Trials (RCT), the procedures section states that RCT minimize selection bias and allocation bias. My understanding is that selection bias "occur if investigators can consciously or unconsciously…
robertspierre
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Is the "constant additive unit causal effect" assumption really needed to interpret a regression coefficient as the ATE?

I am reading Unpacking the black box of causality. At page 768 there is written that, in order to uncover the ATE: In observational studies, slightly more complex calculations may be needed, although under certain assumptions a regression…
robertspierre
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Matching when there are missing data

In a treatment effects framework, I have a control and treatment group with some covariates on which to match (I'm using nearest-neighbor method). The control group has a no missing data, but some covariates are missing for some members of the…
cel
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IPTWs for Multi-category treatment, how to handle a multi-category mediator

I have a multi-category treatment for which selection is adjusted for using IPTWs. My concern regards a multi-category mediator that occurs post-treatment, but which also co-occurs with the outcome. advice to this point includes: 1) controlling for…
Nico
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Are healthy patients an appropriate control group?

I am working on a study where patients with a chronic disease received a treatment. The goal is to determine the effect of the treatment on various outcome variables. I have pre and post data (before and after the treatment) for the sick patients…
Laura
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Statistical Modelling of a complex experimental design

I have the following experimental design, and am quite uncertain which statistical approach would be the best to investigate my data. I have three experimental treatments of my participants and would like to know which influence has the treatment on…
JohnDoe2018
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Modeling decaying treatment effects

Suppose I want to measure the effect of tornadoes on voter turnout at the county level. I suspect that counties that experience tornadoes will have lower voter turnout in the subsequent election than counties that do not, but I also expect the…
Rushmore
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ANOVA - Do I use raw or aggregate mean data to compare groups

Here is my study design: there are four soil plots - A,B,C,D each plot is sampled for soil moisture at 15 locations this soil moisture sampling is done for 10 rain events I need to compare the soil plots A to D for statistical difference of soil…
Kristina
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How to analyze the longitudinal effect of blood pressure and its treatment on outcome

Say I have an observational dataset over 20 years with blood-pressure measured each year for 1000 men. Each year a decision is made whether to start antihypertensive drug A, drug B or continue without medication. This decision is based on the…
Misha
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Take multiple stratified samples from

I am interested in taking three separate stratified samples from a population so that I can assign them to different treatments. I see some obvious issues with this, namely being that elements in the first sample don't have the chance of being in…
Matthias Ronnau
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