CSE 331 Software Design & Implementation Winter 2021 Homework Overview
In this winter 2021 course, students are working on various assignments including HW9 using technologies like Spark Java and React. The assignments involve creating web GUIs, implementing Java servers, and dealing with JSON data. The course covers topics such as Anonymous Inner Classes and Campus Paths. Students are encouraged to be creative and explore different coding opportunities. The assignments are designed to enhance skills in software design and implementation.
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HUDM4122 Probability and Statistical Inference February 2, 2015
Special Session on SPSS Thursday, April 23 4pm-6pm As of when I closed the poll, every student except one could make it to this I am happy to meet individually with students who can t make this session
And people say pie charts arent informative From Jeanine DeFalco
Homework 1 How did it go? How did you like working with the ASSISTments system? Too few problems? Too many? Just right?
What the homework covered Computing the mean, median, mode Symmetric and skewed distributions Variance Standard Deviation
Difficulties with rounding Sorry about that I ll try to be clearer next time
Difficult Problems 3. You are given n=8 measurements: 3, 2, 5, 6, 4, 4, 3, 4. What is the median? We had answers 4, 4.5, 5 Anyone want to explain any of these answers?
Difficult Problems 9. You are given 6 measurements: 5, 4, 4, 6, 8, 6. Calculate the sample variance, s2 We had answers 1.9167, 2.3, 2.5, 3.1, 3.3, 11.5 Anyone want to explain any of these answers?
Beyond these topics, in the last class We looked at how to create and interpret Box Plots And discussed Bimodal Distributions Mean Absolute Deviation Percentiles Z scores
Today Ch. 3 in Mendenhall, Beaver, & Beaver
Today Scatterplots Covariance The Pearson Correlation Coefficient Regression Lines
Univariate Data A single variable is collected Height 5 11 5 11 5 10 5 6
Bivariate Data Two variables are collected (for the same data point) Height Drum-Playing Skill 5 11 1 5 11 2 5 10 4 5 6 8
Multivariate Data 3+ variables are collected Name Height Drum-Playing Skill John Lennon 5 11 1 Paul McCartney 5 11 2 George Harrison 5 10 4 Ringo Starr 5 6 8
Last Class Univariate Data
Today Bivariate Data
Scatterplot Shows the relationship between two variables
Are more expensive brands of peanut butter better? From InterMath intermath.coe.uga.edu
Dependent and Independent Variables Dependent Variable From InterMath intermath.coe.uga.edu Independent Variable
The Independent Variable Influences the Dependent Variable (Maybe) Dependent Variable From InterMath intermath.coe.uga.edu Independent Variable
(You dont always have to be sure) Dependent Variable From InterMath intermath.coe.uga.edu Independent Variable
Data Miners Would Instead Say Predictor and Predicted Variables Predicted Variable From InterMath intermath.coe.uga.edu Predictor Variable
I like this terminology better because it s neutral on causation Predicted Variable From InterMath intermath.coe.uga.edu Predictor Variable
Anyways From InterMath intermath.coe.uga.edu
So which brand of peanut butter should you buy? From InterMath intermath.coe.uga.edu
Which brand of peanut butter should a gourmet buy? From InterMath intermath.coe.uga.edu
Which brand of peanut butter should a gourmet buy? From InterMath intermath.coe.uga.edu
How about a frugal person? From InterMath intermath.coe.uga.edu
How about a frugal person? From InterMath intermath.coe.uga.edu
Who should buy this peanut butter? From InterMath intermath.coe.uga.edu
How about this one? From InterMath intermath.coe.uga.edu
A lot of variability, right? From InterMath intermath.coe.uga.edu
Lets discuss some of the properties of scatterplots
What can you say about the relationship between Price and Quality? Snorgles 300 250 200 Quality 150 100 50 0 0 50 100 150 Price 200 250 300
What can you say about the relationship between Price and Quality? Frungles 250 200 150 Quality 100 50 0 0 50 100 150 Price 200 250 300
What can you say about the relationship between Price and Quality? Trandles 200 180 160 140 120 Quality 100 80 60 40 20 0 0 50 100 150 Price 200 250 300
So in other words Spend your hard earned dollars on expensive snorgles But save your money on frungles and trandles
Quick comment on scatterplots Scatterplots are great
Quick comment on scatterplots Scatterplots are great
Quick comment on scatterplots But they don t scale to really big data sets If your scatterplot just looks like a giant blob or a grid, try a heat map We won t go into detail on heat maps there s a lot to cover today -- but I wanted to put that in your brains
Linear functions All these graphs can be described by linear functions, a.k.a. straight lines
Linear functions All these graphs can be described by linear functions, a.k.a. straight lines Snorgles 300 250 200 Quality 150 100 50 0 0 50 100 150 Price 200 250 300
Figuring out what the best-fitting line is Is the simplest case of linear regression Linear regression is a sophisticated statistical modeling method Focus of HUDM5122 This is just the simplest application of it
Linear Regression: X and Y If the two variables have a linear (straight line) relationship Then we can predict Y s value from X
Finding Y from X If you buy a new snorgle that costs $200, what is its quality likely to be? Snorgles 300 250 200 Quality 150 100 50 0 0 50 100 150 Price 200 250 300
Finding Y from X If you buy a new snorgle that costs $120, what is its quality likely to be? Snorgles 300 250 200 Quality 150 100 50 0 0 50 100 150 Price 200 250 300
