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Data Analysis in Mathematical Modeling
Dan TeagueNC School of Science and Mathematics
teague@ncssm.edu
Wind Chill Table
20 mph row
Residuals for 20 mph Wind Velocity
Residuals for 5-20 mph lines
Residuals for 25-45 mph lines
Fit a line to each row
“Wind velocities greater than 45 mph have little additional cooling effect”.
Semi-log Re-expression
Flip the Residual Curvature
Difference Quotients
Logistic Models
What is the probability a test tube needs to be retested?
• The probability of an individual testing positive is p.
• The probability of an individual testing negative, then, is 1 – p.
• The probability of two individuals both testing negative is (1 – p)(1 – p).
• The probability of G individuals all testing negative is (1 – p)^G.
• The probability of at least on of G individuals testing positive is 1 – (1 – p)^G.
Why Calculus Fails
Data Analysis to the Rescue
The Data Falling on the Solution
We see double asymptotes, so try log-log
Vertical Shift?
Minimize Sums of Squares
Two Potential Models
Should we always group?
CO2 in the Atmostphere
sinC t f t a b t c
Is it exponential?
ln 300 0.0399 0.437C t 0.0399( ) 1.548 300tF t e
Residuals?
0.0399( ) 1.548 300tF t e
sinC t f t a b t c
The residuals from the exponential model
1
3sin 224
S t t
0.0399 1( ) 1.548 3sin 2 300
24tC t F t e t
Data Analysis in Mathematical Modeling
Dan TeagueNC School of Science and Mathematics
teague@ncssm.edu
Which model captures the underlying functional relationship?
Data Analysis in Mathematical Modeling
Dan TeagueNC School of Science and Mathematics
teague@ncssm.edu
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