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Questions tagged [systematic]

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21 views

Confused About Systematic Sampling

So I was going through my notes and ended up extremely confused about a couple of things. 1.Suppose I have 20 employees and my population size is 200. I know that I need to take 200 and divide it by ...
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0answers
4 views

How to extract systematic errors from data

I am a bit confused about estimating the systematic error (I think it is systematic) from an experiment. Here is a (simplified) description of it. Assume that 2 groups measure the length of a cube ...
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0answers
31 views

Error on distribution of values with uncertainties

I'm currently analysing a measurement which results in a high number of values, each having a slightly different uncertainty. These values are following a gaussian distribution, so I wrote a python ...
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1answer
72 views

Simulate data including systematic error!

for my bachelor thesis, I am doing a simulation study in order to compare analysis methods. The generated data is a pre-post design data, with two groups measured at two times. ...
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1answer
134 views

Consider systematic error in a fit

My question arise directly from a lab situation. Let's say I have measured two sets of data $x_i$, $y_i$ and i know both the statistic and systematic error for $y_i$ (I assume no error on $x_i$). ...
3
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1answer
350 views

Confidence interval of AUC with Reitsma model in mada R package

I am conducting a meta-analysis of diagnostic test accuracy studies comparing myocardial perfusion scintigraphy vs coronary angiography using the mada R package. I ...
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2answers
2k views

How to carry out adjusted indirect comparison or 'Bucher method' meta-analysis

I have carried out a pairwise meta-analysis of Drug 1 vs. placebo and a pairwise meta-analysis of Drug 2 vs. placebo (I have used RevMan software to do this). From each meta-analyses I have an overall ...
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1answer
88 views

Drawing a systematic sample

Please clarify the following question: If two independent systematic samples of size four each from a population of 36 units have y-values of a characteristic y as: 24,26,22,28 and 27, 25, 23, 29 ...
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1answer
128 views

Test for compairing data on same days in a week in different years

So I'm doing some power system analysis on active and reactive power loads and I'd like to compare the data from 2015 and data from 2015 to see how much they differ. The nature of the load is such ...
2
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1answer
170 views

Calculating group size from hazard ratio

I am undertaking a systematic review and as part of the data extraction process I would like to know how many patients were analysed in the treatment and control arm (in a particular subgroup). In one ...
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1answer
94 views

Statistic test when bias is not random

Is there a statistical test that I can use to say that there is bias in the result of my analysis but the bias only occurs at certain region. The scatter plot below probably will make more sense: ...
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2answers
2k views

Systematic Sampling with unequal probabilities

I found the library Sampling in R to conduct a systematic random sampling with unequal probabilities. I got my sample but I really don't know how that sample is selected. Is there anyone that can ...
1
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1answer
254 views

Mixing ITT and TOT/LATE Effect Sizes in Meta-Analysis

I have a question concerning the coding of Effect Sizes for a large (educational) Meta Analysis with mostly latent outcome variables. Some studies provide "Intent to Treat" Data from which I ...
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1answer
1k views

How to sum uncertainties, systematic and random

I apologize for the simplistic questions. I have a retrieval process that has a set of random and systematic uncertainties associated with it. I'm assuming that these are all independent. The goal is ...
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0answers
123 views

Incorporating systematic uncertainty in interval estimation

I am trying to fit some binomially distributed data to a model. There is a reasonable systematic error associated with the measurements. This uncertainty comes from imperfect theoretical knowledge of ...