Introduction Power analysis is the name given to the process for determining the sample size for a research study. The technical definition of power is that it is the probability…
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Introduction Power analysis is the name given to the process for determining the sample size for a research study. The technical definition of power is that it is the probability…
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Examples Example 1. A clinical dietician wants to compare two different diets, A and B, for diabetic patients. She hypothesizes that diet A (Group 1) will be better than diet…
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Examples Example 1. A company markets an eight week long weight loss program and claims that at the end of the program on average a participant will have lost 5…
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Examples Example 1. A company that manufactures light bulbs claims that a particular type of light bulb will last 850 hours on average with standard deviation of 50. A consumer…
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When analyzing longitudinal data, we often want to know the first and last non-missing value of a variable that is measured repeatedly over time for each unit (e.g. patient, subject). …
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In this workshop, we will cover only some of what can be done with the PROCESS macro in SPSS. We will focus on mediation models. We will not cover moderation…
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Purpose This seminar is the third and final part in a series of workshops on latent variable models. The first seminar introduces the confirmatory factor analysis model, and discusses model…
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Purpose This seminar will introduce basic concepts of structural equation modeling using lavaan in the R statistical programming language. Its emphasis is on identifying various manifestations of SEM models and…
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Survey Data Analysis with R Why do we need survey data analysis software? Regular procedures in statistical software (that is not designed for survey data) analyzes data as if the…
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