# Questions tagged [treatment]

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### Checking if treatment is effective without control group

I am experimenting with few treatments to see which one is effective. I do not have luxury of control group to compare against. In such scenario, is there any method to see if the treatment has been ...
10 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 = ...
218 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 ...
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 ...
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 ...
59 views

### 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 ...
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 ...
40 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 ...
24 views

473 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 ...
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 ...
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 ...
4k 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 ...