Introduction To Statitics

• understand p-value
  • it is a probability
  • non hypothesis
  • more extreme case
• if p-value == 0.05

  • if you don't care type 1 error, you can change the threshold of p-value to 0.1
    

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• statistics descirbes a numeric set of data by its center, variability, shape
• statittics describes a categorical set of data by its frequency, probability or propotion of each category

Variable:

• nominal: no order
• ordinal: with an inherent rank or order e.g. mild, moderate, severe
• continuous

Distribution:

• unimodal
• bimodal / multimodal
• symmetric