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Chapter 4
- Modelling
- Model - an artificial re-creation of an
object or event that should behave in
the same way as the real thing.
- Object Modelling - allows you to
create a virtual representation of
the item within the computer.
- Mathematical Modelling - uses spreadsheets.
Involves replication - the copying of a cell
either horizontally or vertically.
- Advantages
- Less risky (safer
and cheaper) to test.
- Only one model needs
to be created.
- Can be backed
up and shared.
- Can be accelerated
or slowed down.
- Less risky (safer
and cheaper) to test.
- Model - an artificial re-creation of an
object or event that should behave in
the same way as the real thing.
- Variables, Formulae,
Rules and Functions
- Variable – a changeable
identifier associated with
a particular cell.
- Formula - the way that a calculation is
represented in a spreadsheet.
- Rules - a set of
procedures that must
be followed.
- Function - represents a formula
that is too complex or too long to
expect an ordinary user to enter.
- What if...? questions - an attempt to find
out what is going to happen in the future.
- Variable – a changeable
identifier associated with
a particular cell.
- Parts
- Worksheet - large grid of
cells on a single sheet.
- Workbook - a collection of
more than one worksheet in
the same spreadsheet.
- Row - a range of cells that goes across the spreadsheet.
Column - a range of cells that go down the spreadsheet.
- Cell - an individual data store identified by
a column and row indicator, in that order for
example A4 or AC154.
- Labels - any text in a cell describing
the data in a row or column(titles,
headings that identify data).
- Data - any values (text or numbers)
that are entered for the use of
calculation.
- Formulas and functions - mathematical calculations
carried out automatically.
- Labels - any text in a cell describing
the data in a row or column(titles,
headings that identify data).
- Range - a group of cells.
Reference range - top left
cell reference: bottom right
cell reference.
- Worksheet - large grid of
cells on a single sheet.
- Cell Referencing
- Relative referencing - the cell referenced
in a spreadsheet formula changes when
the formula is copied to other cells.
- Absolute referencing - the referenced
cell in a spreadsheet formula needs to
remain exactly the same when the
formula is copied to other cells.
- Relative referencing - the cell referenced
in a spreadsheet formula changes when
the formula is copied to other cells.
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