Number all the structural degrees of freedom in your truss. In a 2D (planar) truss, each joint can have a maximum of two degrees of freedom: one in the global X-direction and one in the global Y -direction. If a degree of freedom is restrained by a reaction, then it doesn't get a number.
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degree of freedom
The number of degrees of freedom decreases, from 150, by 1 for every parameter that is estimated using the data. If the parameter is known from some other source then there is no effect on the df.
If the two samples are of size n1 and n2 then the t-statistic is distributed with n1 + n2 - 2 degree of freedom.
Strictly speaking, n is the total number of observations in the sample. However, many computer ANOVA programs calculate the grand mean of the observations by default and then deduct one degree of freedom from n to account for the mean, presenting what is in fact n-1 in their outputs.
The superlative degree of stout is stoutest.