Qualitative–Quantitative reasoning and lightweight numbers

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Alan Dix
https://alandix.com/
@alanjohndix
Qualitative–Quantitative reasoning
and lightweight numbers

climate change
numbers matter …
in short ….
being a C21 citizen
covid
Brexit growing
inequality

BBC – fact check

BBC – fact (double) check
raw = £350m
after rebate = £276m
minus half of that = (£138m)
net figure = £138m

arithmetic mathematics
?

the qualitative understanding
of quantitative phenomena

HCI?

HCI for
qualitative quantitative reasoning
in HCI
visualisation
tools for
quick and dirty
calculation

Fitts Law
in practice
HCI for
qualitative quantitative reasoning
in HCI
visualisation
tools for
quick and dirty
calculatio...

scientific QQ
Fitts Law
as cybernetics

Electrostatically-charged crop sprays

Above canopy model
ground at
0 V
open boundary
condition complex
sprayer at
high voltage
+ 1000s V
charged
spray drops
mod...

Within Canopy Model
crop modelled as
straight sides
ground at
bottom
+V – charged spray enters crop
canopy from above;
spe...

Within Canopy Model
crop modelled as
straight sides
ground at
bottom
+V – charged spray enters crop
canopy from above;
spe...

Misses crop (Class I)

Good spread (Class II)

All at the top (Class III)

Connect and re-parameterise
+ 1000s V
above crop model
within
crop model
dimesionless
parameters

Design/engineering interventions
X

BBC – fact (mis)check

data and provenance
quotes and context
Snip!t
make it easy!
1970s file systems, Word and PPT

data and provenance
quotes and context
Snip!t
make it easy!
1970s file systems, Word and PPT

Monotonic reasoning
Shops to politics

↑ more
automation
↓ less
labour needed
↑ higher
productivity
↑ higher
prosperity
↓ less
employment
↓ lower
wages
? people
...

↑ more
automation
↓ decline of
other companies
↑ more
competative
↑ growth
of company
↓ less
jobs elsewhere
↑ more
jobs th...

numerical data
numeric data and innumeracy
–more BBC – 35,000 m3 vs 35 km3
qualitative–quantitative reasoning
–iVolver
–wo...

the size of Wales (TSoW)
478 square kilometers
184.5 square miles
about 1¼ times the size
of the Isle of Wight
184.5
sq mi...

numerical data
numeric data and innumeracy
–more BBC – 35,000 m3 vs 35 km3
qualitative–quantitative reasoning
–iVolver
–ca...

iVolver
(Méndez, Nacenta & Vandenheste, 2016)
https://www.youtube.com/watch?v=wnJ80cEKKxo
https://sachi.cs.st-andrews.ac.u...

calQ
export

WS2 (worksheets)

WS2 (worksheets)

WS2 (worksheets)

a tool ecology

in summary
numbers matter
qualitative–quantitative reasoning
lightweight numeric tools

Qualitative–Quantitative reasoning
and lightweight numbers
Alan Dix
https://alandix.com/

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