qgt | R Documentation |
A function to produce a graph of a "Student's" t distribution with regions shaded according to a specified probability.
qgt(prob, df = 1, tail = "upper")
prob |
The tail probability value to define the region to be shaded on the graph and the corresponding quantile to be displayed. |
df |
Degrees of freedom for the t distribution. Note that the default is 100. |
tail |
Area(s) to be shaded on the graph. If |
Specifying extremely high or low probabilities may not yield visible shaded areas if the regions are beyond the limits of the X axis scale of the graph.
This function can be very helpful in instructional situations and can replace the "t table" from textbooks.
Bruce Dudek bruce.dudek@albany.edu
qgt(.05,df=25,tail="upper")
qgt(.01, df=12,tail="lower")
qgt(.90, df=15, tail="lower")
qgt(.01,df=50, tail="two")
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