Statistics

Statistics

Sampling
1. Quota
2. Convinience
3. Straified
4. Random
5. Cluster
6. Systimatic
Calculations
1. Standard Deviation
  1. Calculates Average distance from the mean
  2. Measures of spread
2. Spearmans Rank Corrolation Coefficient
  1. Tests for corolation
    1. Positive
    2. Negative
3. Variance
  1. Similar to Standard devation
4. Standardised Scores
  1. Standardised Score = (Value - Mean) / Standard Deviation
  2. Anything above 0 is better than average
  3. Less than 0 is worse than the mean
Averages
1. Mean
2. Median
  1. Order all the values and find the middle
3. Range
4. Mode
  1. Most common value
5. IQR
  1. LQ
    1. 1st quarter
  2. UQ
    1. 3rd quarter
Graphs and Charts
1. Histograms
2. Moving Averges
  1. 4 point
  2. 3 point
3. Z charts
4. Quality assurance
5. Scatter diagrams
  1. Test for corolation
    1. Positive
    2. Negative
Probability
1. Scale
  1. Impossible
    1. 0
  2. Even chance
    1. 0.5
  3. Unlikely
    1. 0.25
  4. Likely
    1. 0.75
  5. Certain
    1. 1
2. Tree Diagrams
  1. Multiply along branches
  2. End results should add up to 1
  3. Fractions or percentages
Data Comparison
1. Box Plots
  1. Visual comparaison
    1. Maximum
    2. Minumum
    3. IQR
    4. UQ
    5. LQ
    6. Range
2. Standardised Scores
3. Index Numbers
  1. Simple Index Numbers
    1. Percentages
    2. Index Number = (Value / Value in base year) x 100
  2. Chain Based Index numbers
    1. Index Number = (Value in previous year / Value in current year) x 100
  3. Weighted Index Numbers
    1. Weighted Index Number = Σ(Index Number x Weight) / Σ Weights
Data Comparison Cont.
1. Crude Rates
  1. How many in every thousand
2. Standardised Rates
  1. More useful than crude rates

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	Criado por Ross McKay mais de 9 anos atrás