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Dummy Variable for Examining Structural Instability in Regression: An Alternative to Chow Test

December 13, 2017
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Dummy Variable for Examining Structural Instability in Regression: An Alternative to Chow Test

One of the fast growing economies in the era of globalization is the Ethiopian economy. Among the lower income group countries, it has emerged as one of the rare countries to achieve a double digit growth rate in Grows Domestic Product (GDP). However, there is a great deal of debate regarding the double digit growth Related Post Outliers Detection and...

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Qualitative Research in R

October 20, 2017
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Qualitative Research in R

In the last two posts, I’ve focused purely on statistical topics – one-way ANOVA and dealing with multicollinearity in R. In this post, I’ll deviate from the pure statistical topics and will try to highlight some aspects of qualitative research. More specifically, I’ll show you the procedure of analyzing text mining and visualizing the text Related Post Multi-Dimensional Reduction and...

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Multicollinearity in R

September 29, 2017
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Multicollinearity in R

One of the assumptions of Classical Linear Regression Model is that there is no exact collinearity between the explanatory variables. If the explanatory variables are perfectly correlated, you will face with these problems: Parameters of the model become indeterminate Standard errors of the estimates become infinitely large However, the case of perfect collinearity is very Related Post Scikit-Learn for Text...

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One-way ANOVA in R

August 28, 2017
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One-way ANOVA in R

Suppose as a business manager you have the responsibility for testing and comparing the lifetimes of four brands (Apollo, Bridgestone, CEAT and Falken) of automobile tyres. The lifetime of these sample observations are measured in mileage run in ’000 miles. For each brand of automobile tyre, sample of 15 observations have been collected. On the Related Post Cubic and Smoothing...

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