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普通科学计算器并无Student’s t的键,即使是初级可编程序计算器,也无法利用32～38步编出分组t的程序。作者采用t的乘方转换(t~2)并编就了自由度校正系数(Cn表),克服了上述困难。利用t~2公式及Cn表,在普通的科学计算器上,可以在数分钟内完成t的运算,非常方便、快捷。Cn表的数据可打入程序,使t程序大为缩短。在两组比较的场合,本式亦可直接计算出F值,用于方差分析。采用t~2式时间可节约1倍以上。本式简单方便极合医学工作者及初学者之用。
The scientific calculator does not have the Student’s t key. Even the primary programmable calculator cannot use the 32 to 38 steps to program the group t. The author adopted the power transformation (t~2) of t and compiled the degree of freedom correction coefficient (Cn table) to overcome the above difficulties. Using the t~2 formula and the Cn table, on an ordinary scientific calculator, t can be completed in minutes, which is very convenient and fast. The data of the Cn table can be entered into the program, which greatly shortens the t program. In the two groups of comparison occasions, this formula can also be directly calculated F value for analysis of variance. Using t ~ 2 time can save more than 1 times. This type is simple and convenient for medical workers and beginners.