SOCI301 Lecture Notes - Lecture 7: Square Root, Standard Deviation, Minimax

• School: University of Delaware
• Department: Sociology
• Course: SOCI301
• Professor: liyingluo

Document Summary

Distribution=for discrete: describes how many cases are in each category of the variable. For continuous: describes how many cases have specific numerical values. Freq distribution=a table that lists how frequently each value of a variable occurs in the data. Percentage distribution=a table that lists the percentage of times each value of a variable occurs in the data. Cumulative percentage distribution=a table that lists the percentage of cases in the data that fall at or below each value of a variable (these won"t make sense for nominal variables bc no intristic order of the values) Limitations of the range: gives you little info about the other observations except 2 observations with extreme values: variance: the mean (average) squared diff between each observation and their mean. (y1-avgy)^2 + (y2-avg y)^2 /n-1. Compute the diff between each observation value and mean & make sure the sum is 0. Divide the sum by n-1: standard deviation: the positive square root of the variance.