math (unit 3 and 4)

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  • r value = strength of the correlation
  • mean = add all values / number of values
  • DST = Daylight Saving Time, +1 for the UTC
  • r2 value = variability of the correlation
  • r2 to r = square root r value
  • r to r2 = square r value
  • Deseasonalised Data = number of values / seasonal index
  • Strong Correlation = 1
  • Weak Correlation = 0-0.4 range
  • Moderate Correlation = 0.5 and above
  • categorical data = data without numerical values
  • numerical data = data with numerical values
  • interpolation = data which is within the data range
  • extrapolation = data which exceeds the data range given
  • extrapolation danger - cannot be sure with data that exceeds the ranges of data as the r and r2 values do not apply to these values, making their correlation to the dataset, unknown and unreliable.
  • 3 point moving average = adding 3 values of the dataset / the number of the values (3)
  • centred moving avg = same process but divided by the centred value eg: x = 40, divide by 40
  • least squares equation = ab + x
  • equation of a line = mx + b
  • mx = gradient
  • b = y-intercept
  • y-intercept is where the graph crosses the y axis
  • x-intercept = when y is zero
  • gradient is how steep the line is
  • arithmetic sequence = a sequence of numbers where the sum of the first n terms is equal to the sum of the n+1 terms
  • common difference = d
  • common ratio = r
  • ratio = geometric sequence
  • difference = arithmetic sequence
  • simple interest = arithmetic sequence
  • compound interest = geometric sequence
  • appreciation = going up in value
  • depreciation = going down in value
  • 360/24 = 15 degrees (time zones)
  • UTC = Coordinated Universal Time, a time standard that is used to define the time of day in relation to the rotation of the Earth.
  • latitude = the angle of the sun at a particular point on the earth's surface
  • longitude = the angle of a line passing through the centre of the earth and the point on the earth
  • latitude before longitude
  • prime meridian = zero degree longitude
  • meridian = imaginary lines running from pole to pole