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[4]: 114 A DataFrame is a 2-dimensional data structure of rows and columns, similar to a spreadsheet, and analogous to a Python dictionary mapping column names (keys) to Series (values), with each Series sharing an index. [4]: 115 DataFrames can be concatenated together or "merged" on columns or indices in a manner similar to joins in SQL.
The non-primary key Units_Sold column of the fact table in this example represents a measure or metric that can be used in calculations and analysis. The non-primary key columns of the dimension tables represent additional attributes of the dimensions (such as the Year of the Dim_Date dimension).
For instance, the 10% trimmed mean is the average of the 5th to 95th percentile of the data, while the 90% winsorized mean sets the bottom 5% to the 5th percentile, the top 5% to the 95th percentile, and then averages the data. Winsorizing thus does not change the total number of values in the data set, N.
In the more general multiple regression model, there are independent variables: = + + + +, where is the -th observation on the -th independent variable.If the first independent variable takes the value 1 for all , =, then is called the regression intercept.
About the Presidential Race. Electoral votes: 11; Pollster estimate: Strong Romney; Download final results; What to Watch. The Obama campaign has toyed with the idea of contesting Arizona in 2012, but Mitt Romney is expected to score a single-digit victory here.
Here * denotes the conjugate transpose. Since the only two vectors involved are x and e, the vector u must have the form u = a x + b e, where a and b are complex coefficients to be determined. Since an overall phase factor for u does not matter, the coefficient a can be chosen to be positive real. Now Q x = x (1 – a (u* x)) - e (b (u* x)).
For the cadets and midshipmen on the field, a career playing professional football is unlikely. This game is their Super Bowl. “It represents a battle between two of the nation’s best forces ...
Ranked-choice voting (RCV) can refer to one of several ranked voting methods used in some cities and states in the United States. The term is not strictly defined, but most often refers to instant-runoff voting (IRV) or single transferable vote (STV), the main difference being whether only one winner or multiple winners are elected.