Field Function 



Value 



Is default value for n,(.0002), 

 in the convergence criteria to 

 be overridden?.!' 



Yes = desired 

 value for n 



No 



b 1 ank 



Is default value for x,(.01), in 

 the convergence criteria to be 

 overridden? 



Yes = desired 

 value for t 



No = blank 



Card 3 



Are the starting values for 

 parameter estimates to be 

 provided?^' 



Limit for sum of weights- 

 Card 4 



No = o 



Yes = desired 

 value of 6 n 



Column Name Format 



51-60 ERR F10.0 



61-70 TAU F10.0 



1-10 PO F10.0 



11-20 I! F10.0 



21-30 VARLAB F10.0 



31-40 FLIM F10.0 



Code designating a missing value 



in an observation!.' xx...x 



Are the variables to be No = 



labeled on the computer output? 



Yes = number of 

 labels provided 



Number of variables to be read for 



each observation {<_ 32) xxxxx 1-5 LIM 15 



Card 5 



NOTE: On card 5, the absolute value of A is the observation number at which matrix 

 correction would occur. 



— The default values for the parameters of the convergence criteria are satisfac- 

 tory for most uses of RISK. If increased precision is desired, however, the value of 

 n should be decreased. Conversely, if less precision is required, n can be increased 



— ^Starting values for the parameter estimates are generated by RISK. These are: 



Sj = (j = l,...,n) _ 



3 = solution of the equation r = [l + exp(-B+)] 

 p = mean value of dependent variable in the Dopulation. 

 An alternative value for 3o ma Y be specified on control card 3. 



l/Each missing value in the data should be coded. RISK deletes any observation 

 that has one of the independent variables set equal to the missing value code. 



L'The limit for the sum of weights should normally be set equal to 0.5. However, 

 if the data are sorted or if the observations have unequal weights, the resulting 

 estimates of P may be driven to or 1 . When this occurs, the limit for the sum of 

 weights should be increased until the difficulty is overcome. 



13 



