HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 561

(Continuous FUNctions) and define the following functions (change to Approx mode): Gamma pdf: 'gpdf(x) = x^(α-1)*EXP(-x/β)/(β^α*GAMMA(α))' Gamma cdf: 'gcdf(x) = ∫(0,x,gpdf(t),t)' Beta pdf: ' βpdf(x)= GAMMA(α+β)*x^(α-1)*(1-x)^(β-1)/(GAMMA(α)*GAMMA(β))' Beta cdf: ' βcdf(x) = ∫(0,x, βpdf(t),t)' Exponential pdf: 'epdf(x) = EXP(-x/β)/β' Exponential cdf: 'ecdf(x) = 1 - EXP(-x/β)' Weibull pdf: 'Wpdf(x) = α*β*x^(β-1)*EXP(-α*x^β)' Weibull cdf: 'Wcdf(x) = 1 - EXP(-α*x^β)' Use function DEFINE to define all these functions. Next, enter the values of α and β, e.g., 1K~,a` 2K ~,b` Finally, for the cdf for Gamma and Beta cdf's, you need to edit the program definitions to add NUM to the programs produced by function DEFINE. For example, the Gamma cdf, i.e., the function gcdf, should be modified to read: « x ' NUM( ∫ (0,x,gpdf(t),t))' » and stored back into @gcdf. Repeat the procedure for βcdf. Unlike the discrete functions defined earlier, the continuous functions defined in this section do not include their parameters (α and/or β) in their definitions. Therefore, you don't need to enter them in the display to calculate the functions. However, those parameters must be previously defined by storing the corresponding values in the variables α and β. Once all functions and the values α and β have been stored, you can order the menu labels by using function ORDER. The call to the function will be the following: ORDER gpdf','gcdf','βpdf','βcdf','epdf','ecdf','Wpdf','Wcdf'}) Following this command the menu labels will show as follows (Press L to move to the second list. Press L once more to move to the first list): Page 17-8