Regression is a statistical tool used mainly to study the association between: Uses: Types of regression based on outcome variable (y): Remember the “NOIR” mnemonic for the types of variable. Types of regression based on number of independent variables (x): Regression vs Correlation: Correlation measures the strength of the association…
Tag: Biostatistics
PGMEE, MRCS, USMLE, MBBS, MD/MS
Statistics – High Yield (Cheat Sheet)
Normal distribution Non-normal distribution a. Positive skew: Longer or fatter tail on right b. Negative skew: Longer or fatter tail on left 2X2 tables Disease present Disease absent Test positive TP FP Test negative FN TN Event Non-event Exposed or Treatment a b Non-exposed or Placebo c d Formulae Incidence…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Which statistical test to use?
Steps: Types of data Mnemonic: NOIR Qualitative or Categorical data a. Nominal (relating to name): Groups e.g. gender (male/female), color (black/white), blood groups (A/B/AB/O), religions (hindu/muslim/christian) b. Ordinal (relating to order): Rank-ordered data but without meaningful difference; e.g. socio-economic status (low, middle and high), rank (1st, 2nd and 3rd)– without…