Questions tagged [treatment]

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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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465 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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31 views

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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498 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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146 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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13 views

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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2 views

Can a single SEM calculated across multiple reps and treatments be used to determine the difference between treatment means?

A little context: I'm looking at some articles and in most of them the authors report treatment means and the standard errors (SE) for each treatment mean (e.g., Treatment A = 100±10, Treatment B = ...
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10 views

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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13 views

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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27 views

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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35 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
53 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
77 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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1answer
18 views

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 ...