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Colt Police Positive-revolver in .32 Colt New Police with a 6" barrel. This is a right-handed model. The Police Positive Special was an iterative improvement of Colt's earlier Police Positive model, the only differences being a slightly lengthened cylinder and elongated and strengthened frame to allow the chambering of the longer, more powerful .32-20 Winchester and .38 Special cartridges. [3]
Initially made only with a 6-inch (15 cm) barrel, a compact 4-inch (10 cm) came afterward. Between 1955 and 1994, a downsized 2.5-inch (6.4 cm) barrel version was introduced which still sported full-sized grips. Colt also produced a few short runs of revolvers with a 3-inch (7.6 cm) barrel known to collectors as "Combat Pythons." [27] [28]
Weighing 22 ounces and available with a blued finish and black hard rubber grips in .22 Long Rifle, .22 WRF, .32 Long (and Short) Colt, and .32 Colt New Police (.32 S&W Long) chamberings, the First issue of this model featured an adjustable open iron sighted 6 inch barrel and was marketed from 1910 to 1925, with checked Walnut grips replacing ...
A correlation coefficient is a numerical measure of some type of linear correlation, meaning a statistical relationship between two variables. [ a ] The variables may be two columns of a given data set of observations, often called a sample , or two components of a multivariate random variable with a known distribution .
The first variant, the Officer's Model Target appeared in 1904 as a Premium model more focused on sport shooting than on common use, it was produced in 7.94 mm (.32) and 9 mm (.38) calibers, with barrels whose lengths ranged from 4 in (101.6 mm) to 7.5 in (190.5 mm), with 6 in (152.4 mm) being the most common.
Fitz Special. John Henry Fitzgerald, an employee of Colt Firearms from 1918 to 1944, first came up with the Fitz Special snubnosed revolver concept around the mid-1920s, when he modified a .38 Special Colt Police Positive Special revolver, [5] by shortening the barrel to two inches (5.1 cm), shortening the ejector rod, bobbing the hammer spur, rounding the butt, and removing the front half of ...
Pearson's correlation coefficient is the covariance of the two variables divided by the product of their standard deviations. The form of the definition involves a "product moment", that is, the mean (the first moment about the origin) of the product of the mean-adjusted random variables; hence the modifier product-moment in the name.
In statistics, the phi coefficient (or mean square contingency coefficient and denoted by φ or r φ) is a measure of association for two binary variables.. In machine learning, it is known as the Matthews correlation coefficient (MCC) and used as a measure of the quality of binary (two-class) classifications, introduced by biochemist Brian W. Matthews in 1975.