Regression Analysis: Modeling Qualitative Variables
Modeling Qualitative Variables with Regression
I. Qualitative Independent Variables
a. Modeling Values as Base and Differences
On July 19th, 2011, Dell Computers offered a base Inspiron 600 for $299.99. A buyer could customize this computer. One of the choices was the type of Office 2010, where Windows 7 Home Premium was included in the base price:
- If you wanted Microsoft Office and Student 2010, add $119 (price becomes $418).
- If you wanted Microsoft Office Home and Business 2010, add $199 (price becomes
The Great Gatsby: A Summary and Analysis
Chapter 1: The Green Light
The reader is introduced to the main characters and their traits: the uninhibited Jordan Baker, the unpolarized Nick Carraway, the sassy Daisy Buchanan, the aggressive Tom Buchanan, and the enigmatic Jay Gatsby.
Chapter 2: The Ashy Side Chick
Tom Buchanan’s infidelity is revealed. Nick accompanies Tom to the Valley of Ashes to meet Tom’s mistress, Myrtle. Myrtle hosts a small party, and Tom breaks her nose after she repeatedly mentions Daisy’s name.
Chapter 3: An Invitation
Read MoreSymbols and Class Divisions in The Great Gatsby
The Eyes of God
The eyes of God represent the idea that “Somebody is always watching.” The billboard is described as a pair of eyes looking through yellow spectacles. There is no face. The eyes symbolize someone always watching, the yellow rims represent the corruption of society and characters, and the lack of a face represents the hollowness of some characters.
The Green Light
First discovered by Nick when he watches Gatsby standing on his lawn, gazing at a green light emanating from the dock. The
Read MoreLinear Regression Models: Building, Selection, and Variables
Linear Regression Models
Theoretical/Population Model
µy = β0 + β1×1 + β2×2 + β3xi + β4xf or y = β0 + β1x + ε where ε ∼ N(0, σ) – can describe the relationship between x’s and y using a simple linear regression.
- µy — average (mean) value of y in population for fixed value of x
- β0 — population intercept – the mean value of the response when the explanatory variable is 0
- β1 — population slope – the mean change in the response for every one unit increase in the explanatory variable
- xi
Machine Learning Key Concepts: A Quick Review
Machine Learning Key Concepts
1. You have a dataset with 7 features and 3 different labels. Which of the following would be a valid NN model? All of the above
2. Which of the following is not a data preprocessing task? Data translation
3. On a neural network, the output layer represents… Labels
6. Which is the output of this code? [[0,0,1], [0, 1,0],[1,0,0]]
7. What does this confusion matrix represent, where 1= positive and 0 = negative & T=True and F=False? TP=41, TN=116, FP=9, FN=26
9. With data
Read MoreGatsby’s World: A Chapter-by-Chapter Synopsis
Chapter 1: The Green Light
In the first chapter, the reader gets an introduction to the characters and their character traits:
- Jordan Baker: Uninhibited
- Nick Carraway: Unpolarized
- Daisy Buchanan: Sassy
- Tom Buchanan: Aggressive
- Jay Gatsby: Mysterious
Chapter 2: The Valley of Ashes
In chapter two, the reader learns that Tom Buchanan is unfaithful. Nick, being observant, rides with Tom on the train to the valley of ashes to see Tom’s mistress, Myrtle. Myrtle tells her husband that she’s going to visit her
Read More