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Mathematics
Quick fact
Error variance is often called 'noise' in data; in a perfect experiment, it would be zero, but in reality, it's always present and is estimated from the data itself.
Why this is interesting
Why do repeated measurements of the same object never give exactly the same number? That unpredictable scatter is error variance—and it's the key to knowing how much you can trust your data.
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Subjects · study & training · careers
Choose something you are considering. FACTREE will give you a clear picture of what it contains, how its main parts connect and where it could lead.
This private catalogue connects 31 subjects, study routes and careers across six broad areas. Public Maps and learner routes remain off.
Browse subjects
Open a subject to see its complete shape at a glance. You can always return here and choose something else.
See what programming involves, how its main areas connect, and whether you find the knowledge interesting enough to take it further.
Structuring the Programming Map…
Complete subject map
Move from the one-screen overview into all 19 areas. Open any area, compare possible Paths and return to the overview whenever you want.
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Curiosity quiz
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Administrator
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Knowledge architecture
This background view organises existing cards. It is separate from the authored lessons above.
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Curriculum coverage
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