Sökning: "Ragna Reinhammar"

Hittade 2 uppsatser innehållade orden Ragna Reinhammar.

1. 1. Evaluating Risk Factors with Regression : A Review and Simulation Study of Current Practices

   Master-uppsats, Uppsala universitet/Statistiska institutionen

   Författare :Ragna Reinhammar; [2022]
   Nyckelord :;

   Sammanfattning : The term ”risk factor” is used synonymously with both predictor and causal factor, and causal aims of explanatory analyses are rarely stated explicitly. Consequently, the concepts of explaining and predicting are conflated in risk factor research. LÄS MER

3. 2. Estimation of Regression Coefficients under a Truncated Covariate with Missing Values

   Kandidat-uppsats, Uppsala universitet/Statistiska institutionen

   Författare :Ragna Reinhammar; [2019]
   Nyckelord :Key words: missing data handling; linear regression; truncated normal distribution; EM-algorithm; Listwise Deletion; MICE;

   Sammanfattning : By means of a Monte Carlo study, this paper investigates the relative performance of Listwise Deletion, the EM-algorithm and the default algorithm in the MICE-package for R (PMM) in estimating regression coefficients under a left truncated covariate with missing values. The intention is to investigate whether the three frequently used missing data techniques are robust against left truncation when missing values are MCAR or MAR. LÄS MER