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Questions tagged [treatment]

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Analyzing Data for multiple treatment groups

I'm currently designing a research proposal to analyse the effect of varying the amount of cash transfered in a conditional cash transfer program on raising school attendance rates. The cash ...
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Statistical analysis of multiple trials (3 categories) at 3 time periods for 2 group of subjects

I am confused about statistical analysis of an experiment in which there are two groups of subjects i.e. experimental & control. Each group goes through a treatment and multiple readings of ...
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1answer
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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 ...
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Standard Error of a formula

If I do have 100 samples of irrigated plants (labeled from 1 to 100) and 100 samples of non-irrigated plants (during 5 days) (labeled to 101 to 200) from a drought tolerant specie and 100 samples ...
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23 views

Marginal independence sufficient for showing that ATE is identified?

I have a basic question on the relation between counterfactual outcomes and treatment. In what follows ATE means average treatment effect. Notation: Let $D$ denote the treatment, taking value in $\{...
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34 views

Marginal independence sufficient for showing ATE=ATT?

I have a basic question on the relation between counterfactual outcomes and treatment. Notation: Let $D$ denote the treatment, taking value in $\{0,1\}$ where $D=0$ means untreated and $D=1$ means ...
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1answer
37 views

Understanding the perfect randomization assumption in treatment models

I have a basic question on the relation between counterfactual outcomes and treatment. Notation: Let $D$ denote the treatment, taking value in $\{0,1\}$ where $D=0$ means untreated and $D=1$ means ...
2
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1answer
49 views

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 ...
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1answer
49 views

Interacting treatment variables with independent variables in matched samples

Can we interact the treatment variables with independent control variables that have been used for matching? I have a binary treatment variable called 'medicine'. It indicates whether a person ...
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1answer
45 views

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 ...
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How many subjects to sample in the comparison group?

I am conducting an experiment, where I would randomly select schools for inclusion in a project. There are 100 schools, that need to be selected for the project. I'd keep another 100 for control. ...
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1answer
21 views

Test for significance before testing

I got a question regarding the binomial distribution and testing for significance in general. I need to divide a dataset into a treatment group (with phone call) and a control group (no phone call). ...
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1answer
33 views

Difference-in-Difference to identify treatment effect, with the treatment switched on/off?

In a classic DID model, the policy (or the treatment status) stay, once switched on, the same across the observation periods. That is, you have some units that are all untreated before the observation ...
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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 ...
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487 views

Difference in difference model with multiple time periods and treatment/control pairs

I am trying to estimate a difference in difference model with 10 time periods (t=10) and many different plots of land, which are the unit of observation. Each plot of land which becomes treated at ...
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1answer
74 views

Is a Mixed ANOVA the same as a combination of between ANOVA + repeated ANOVA + between ANOVA?

In my study involving three conditions (control, treatment 1, treatment 2), I am interested in measuring 2 DVs at a pre- and post-exposure. So effectively a 3x2 design (participants randomly allocated)...
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145 views

Analysis of pre-post treatment data with changes over time

I am working on a project that used the following design: I have gene expression data (>20000 genes) collected at 6 time points in 16 participants during over a certain time period. Next, they ...
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1answer
209 views

The implications of non-random allocation of intervention

I'm trying to understand the implications of an intervention which is not randomly allocated in a quasi-experimental setting. The intervention is receiving a license for shale gas exploration in the ...
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454 views

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 ...
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Validity of conclusion of statistical tests when comparing two groups of observations in an experiment

I am just reading the results of an experiment, and I am having a hard time estimating their validity. In the experiment, several participant had to perform a certain task twice, once with the ...
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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 ...
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1answer
3k views

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 ...
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1answer
3k views

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 ...
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1answer
188 views

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 ...
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1answer
338 views

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 ...
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1answer
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How to calculate the post-hoc treatment effect depending on initial burden of patient

I have longitudinal data following patients before and after a dichotomous treatment. Exploratory analyses strongly suggest that the effect of the treatment depends on the initial burden of the ...