Franklin D. Roosevelt: Life Before the Presidency. Franklin D. Roosevelt: Life Before the Presidency. Franklin Delano Roosevelt was born to James and Sara Roosevelt in 1882. James was a land-owner and businessmen of considerable, but not awesome, wealth from New York.
How to Measure Variability in Statistics. Statisticians use summary measures to describe the amount of variability or spread in a set of data. The most common measures of variability are the range, the interquartile range (IQR), variance, and standard deviation.
Variability is defined as fluctuations in the baseline that are irregular in amplitude and frequency0 120 90 60 No longer ââ¥2 cycles per minuteâ No distinction is made between short-term (beat-to-beat) variability and long term variability because in actual practice they are visually determined as a unit