Questions tagged [randomized-experiment]

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19 views

Can I draw a smaller sample from one treatment group?

in an RCT, I have 3 different treatment groups and one control group. The size of the control group is around 1000 while the size of other groups are just above 300. To test balance I used ANOVA and ...
4
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2answers
35 views

Randomisation and balance in experiments

Suppose we are interested in the effect of some 'treatment' on some outcome of interest. A common practice is to select a group of people and then randomly choose some fraction (often half) to receive ...
1
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0answers
22 views

Calculate power for multiple rounds of public goods experiment

I would like to calculate/simulate the a-priori necessary sample size for a repeated public goods experiment. $N$ Participants play $R$ rounds of a public goods game (linear, voluntary contribution ...
2
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1answer
28 views

Software for field work: collecting survey data (multi-platform, on-line and off-line)

As part of an RCT, I am looking for Software to record digitally the answers some survey questionnaires. The questionnaire is somewhat long, ~100 questions divided into 10 blocks. We will collect 3 ...
5
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2answers
334 views

Problems with Representative Sampling

I am curious: what exactly are the problems caused by using representative sampling rather than random sampling whenever creating a subsample of large dataset for nonexperimental analysis. Further, ...
3
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1answer
939 views

How encouragement design works practically?

I'm trying to understand the encouragement design but I have some doubts. For example, if I want to introduce a voucher for teachers that can be used for professional development(the treatment) and I ...
11
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3answers
251 views

Self-selection bias during the course of experiments

Suppose you are running a randomized experiment to assess the effect of $X$, say some training program for unemployed people, on $Y$, say the chance of finding a job in the coming year. Suppose also ...