LDS Flashcards
1
Q
Engine size
A
One missing or incorrect value (0)
Values range from 647-4951
2
Q
Year registered
A
All registered in 3rd-9th June 2002 or 6th-12th June 2016
3
Q
Mass
A
92 incorrect or missing values (0)
Values range between 925-2450
4
Q
CO2
A
2 missing or incorrect values (0)
Values range between 13-356
5
Q
CO
A
13 missing values (blank)
Values range between 0.013-1.249
6
Q
NOX
A
74 missing values (blank)
Values between 0.002-0.652
7
Q
Part
A
3105 missing values (blank)
Values range between 0.001-1.495
8
Q
hc
A
1422 missing values (blank)
Values range between 0.003-0.169
9
Q
How can we avoid using missing/incorrect data?
A
Clean the data before sampling
10
Q
Summary (8 points)
A
- only 5 makes
- only includes cars from England (not UK)
- only one electric and one petrol vehicle in the whole database
- data only from a few days in summer in 2002 and 2016
- mass includes a 75kg driver
- emissions data only known for around 80% of the whole database
- particular (part) emissions are only applicable to diesel cars
- sample sizes different for each year
11
Q
Small angle approximations
A
sinx = x
tanx = x
cosx = 1 - x²/2
12
Q
dy/dx (sinx)
A
= cosx
13
Q
dy/dx (cosx)
A
= -sinx
