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How to test time series autocorrelation in STATA

This article shows a testing serial correlation of errors or time series autocorrelation in STATA. An autocorrelation problem arises when error terms in a regression model correlate over time or are dependent on each other. Why test for autocorrelation? It is one of the main assumptions of the OLS estimator according to the Gauss-Markov theorem that in […]

Assumptions and Diagnostics Tutorial assignment

Assumptions and Diagnostics Tutorial assignment Tutorial 6 (Week 7) Assumptions and Diagnostics Tutorial assignment: What might Ramsey’s RESET test be used for? Ans: The Ramsey’s RESET test is a test to determine the correct functional form. Ramsey’s RESET test is a test of whether the functional form of the regression is appropriate. In other words, […]

How to Write a Thesis Statement

How to Write a Thesis Statement What is a Thesis Statement? Almost all of us—even if we don’t do it consciously—look early in an essay for a one- or two-sentence condensation of the argument or analysis that is to follow. We refer to that condensation as a thesis statement. Why Should Your Essay Contain a […]

Types of Measurement Scales – Nominal, Ordinal, Interval, and Ratio

How variables are categorized, counted, or measured—uses measurement scales, and four common types of scales are used: nominal, ordinal, interval, and ratio. The first level of measurement is called the nominal level of measurement. A sample of college instructors classified according to subject taught (e.g., English, history, psychology, or mathematics) is an example of nominal-level […]

When to use the chi-square goodness of fit test – tables, formulas and examples

The chi-square goodness of fit test is a statistical test used to determine whether there is a significant difference between the expected and observed frequencies in one or more categories. It is often applied when dealing with categorical data and is useful for assessing whether the distribution of observed categorical data differs from a theoretical […]

How to Write an Argumentative Essay: Examples & Tips

How to Write an Argumentative Essay: Examples & Tips Writing an argumentative essay involves presenting a well-supported argument in favor of a particular thesis statement. Whether you encounter this task in high school or at the university level, mastering the art of argumentation is crucial. This article provides a guide on how to write an […]

Exploratory Factor Analysis (EFA) Results Interpretation

Exploratory Factor Analysis (EFA) Results Interpretation  Appropriateness of data (adequacy) KMO Statistics Marvelous: .90s Meritorious: .80s Middling: .70s Mediocre: .60s Miserable: .50s Unacceptable: <.50 Bartlett’s Test of Sphericity Tests hypothesis that correlation matrix is an identity matrix. Diagonals are ones Off-diagonals are zeros A significant result (Sig. < 0.05) indicates matrix is not an identity […]

Factoring Methods in Exploratory Factor Analysis (EFA)

Factoring Methods in Exploratory Factor Analysis (EFA) There are three main methods for factor extraction. Principal Component Analysis (PCA) Use for a softer solution Considers all of the available variance (common + unique) (places 1’s on diagonal of correlation matrix). Seeks a linear combination of variables such that maximum variance is extracted—repeats this step. Use when […]

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