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Business intelligence practica sessie 1
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Oplossingen met prinsscreens van de zelfevaluaties, practica sessie 1.
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1Business intelligence
Zelfevaluatie: Data-exploratie in WEKA
Download de mushroom dataset van Ufora, en open deze in WEKA. Beantwoord
vervolgens onderstaande vragen.
Hoeveel instances telt deze dataset?
£ 23
£ 1
£ 22
R 8124
Er zijn 8124 instances in deze dataset.
Hoeveel attributen telt deze dataset?
R 23
£ 22
£ 1
Hoeveel instances zijn "edible"?
£ 3916
R 4208
£ 8124
Er zijn 4208 instances die tot de klasse "e"="edible" behoren. 3916 instances zijn "poisonous",
of dus "p". In totaal zijn er 8124 instances
, 2
Hoeveel mogelijke waarden zijn er voor ring-type?
£ 7
R 5
£ 9
£ 3
Volgende 5 waarden voor ring-type zijn mogelijk: p, e, l, f, n.
Voor hoeveel instances is habitat gelijk aan "m"?
£ 3916
£ 4208
R 292
£ 368
Als je in Weka het attribuut selecteert, kan je voor elke (nominale) waarde zien, hoeveel
instances deze waarde hebben. Voor habitat="m" zijn er 292 instances.
Wat is het data-type van gill-size?
£ Numeriek
R Nominaal
Alle attributen in deze dataset zijn nominaal.
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