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.
Short term variability (STV) describes the beat-to-beat fluctuations in the FHR measured from R wave to R wave by fetal ECG. Long term variability (LTV) represents the amplitude changes of the normal baseline over time, with a cyclic changes occurring in less than one minute.