Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [systematic]

18 questions
4
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1 answer

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 that on same days in a week we have more or less a…
PowerSystemAnalysis
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3
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1 answer

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 to find the total error for this process. I have…
user8675309
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3
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1 answer

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 have completed the computations for the Reitsma bivariate model, as…
Giuseppe Biondi-Zoccai
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What is systematic information in a statistical model / random variable? What can be deterministic about something random?

Often, we try to model data $ \{(x_i, y_i): \ i=1,2,...,n \}$ by assuming a "data generating process" for the data: $$Y = f(x)+\epsilon$$ where we call $f(x)$ the (deterministic) "systematic component" and $\epsilon$ the (random) "non-systematic…
user523384
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2
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1 answer

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 included study, the only information given (for…
ilja.thomas
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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 one of the parameters assumed by the model. I can…
Bowler
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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 20 giving me an interval of 10. I randomly…
Cece
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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 program, which fits a gaussian distribution over a…
Tim
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2 answers

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 estimate of the log of the risk ratio,…
Harose
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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 explain how a systematic sampling with unequal…
CreamStat
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1 answer

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 calculate Effect Sizes (Hedges g) and some studies only…
Tim K.
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Linear regression with statistical and systematic error in y and statistical error in x

I was wondering what is the best way to perform a linear regression if I have a data with uncertainties in $y_i$ and $x_i$ (which are not necessarily the same). And suppose that $y_i$ has a systematic uncertainty $\Delta{y_i}$ and statistical…
Igor Sokolov
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Difference between Correlates and Predictors?

In systematic literature reviews, we see the words antecedents and correlates. What is the exact difference between these two and how do we decide that a particular variable is an antecedent or a correlate of a variable which is the focus of our…
nazish jawad
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Systematic error in time series simulations(?)

Statistical models of time series tend to underestimate points above average and overestimate points below average, due to regression to the mean. If points above and below average are treated separately, the error associated with the two subsets…
Stefano
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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. #parameters b0 <- 0 b1 <- .2 #treatment X <- matrix(0,ncol=1,nrow=n)…
Sven Kleine Bardenhorst
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