Taking Account

Previously we found that the solution of a system of two linear equations in two unknowns gives the point of intersection of the graphs of the two equations involved. In particular, if one of the equations represents a linear cost function and the other a revenue function, then this point of intersection is called the break-even point.

Linear Algebra, Calculus, and Probability; Lloyd Emerson, Western New England College



Panel Data

In statistics and econometrics, the term panel data refers to two-dimensional data. In marketing, panel data refers to data collected at the point-of-sale (also called scanner data).

Data are broadly classified according to the number of dimensions. A data set containing observations on a single phenomenon observed over multiple time periods is called time series. In time series data, both the values and the ordering of the data points have meaning. A data set containing observations on multiple phenomena observed at a single point in time is called cross-sectional. In cross-sectional data sets, the values of the data points have meaning, but the ordering of the data points does not. A data set containing observations on multiple phenomena observed over multiple time periods is called panel data. Alternatively, the second dimension of data may be some entity other than time. For example, when there is a sample of groups, such as siblings or families, and several observations from every group, the data is panel data. Whereas time series and cross-sectional data are both one-dimensional, panel data sets are two-dimensional.

Data sets with more than two dimensions are typically called multi-dimensional panel data.
Arellano, M. Panel Data Econometrics, Oxford University Press 2003.
cited in wikipedia






The truthiness, the whole truthiness and nothing but the truthiness?
In 2005 the American Dialect Society voted truthiness as the word of the year. Recently popularized on the Colbert Report, a satirical mock news show on US television, truthiness refers to the quality of preferring concepts or facts one wishes to be true, rather than concepts or facts known to be true.

Taking a closer look at truthiness from R. W. Holder's How Not To Say What You Mean: A Dictionary of Euphemisms.

Source: www.askoxford.com





How do I love thee? Let me count the ways.
—Elizabeth Barrett Browning, 1850