topic Re: Tweedie CDF in SAS Studio

Tweedie CDF

nikolasfilbert — Mon, 16 Apr 2018 10:06:31 GMT

Hi! I would like to ask a question regarding CDF Tweedie in SAS. I read this link

http://documentation.sas.com/?docsetId=ds2ref&docsetTarget=n0sqs8cpv6ucnkn1upsfmy7tm3yl.htm&docsetVersion=9.4&locale=en , and I found this statement :

y=cdf('TWEEDIE', .8, 5)

But the statement won't work in my SAS University Edition. The result is :

1 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK;

73 y=cdf('TWEEDIE', 0.8, 5);

180

ERROR 180-322: Statement is not valid or it is used out of proper order.

75 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK;

Anyone knows why is it like this? Thanks!

Re: Tweedie CDF

RW9 — Mon, 16 Apr 2018 10:45:07 GMT

CDF is a function, and is part of the proc ds2 step.

https://blogs.sas.com/content/sgf/2016/02/19/reasons-love-proc-ds2/

You have to write the procedure to generate this, to start with:

proc ds2;
  ...
quit;

Put your statements in where the elipses are.

Re: Tweedie CDF

nikolasfilbert — Mon, 16 Apr 2018 12:04:03 GMT

I wrote it like this :

proc ds2;
y=cdf('TWEEDIE', 0.8, 5);
quit;

but there is no output, and I got this log:

1 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK;

73 proc ds2;

74 y=cdf('TWEEDIE', 0.8, 5);

75 quit;

WARNING: Some DS2 statements have not been executed. Use the RUN; statement to execute DS2 statements before QUIT;.

NOTE: PROCEDURE DS2 used (Total process time):

real time 0.05 seconds

cpu time 0.03 seconds

77 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK;

Can you tell me why?

Re: Tweedie CDF

RW9 — Mon, 16 Apr 2018 12:26:38 GMT

Am afraid I can't, I don't use DS2 procedure. You need to learn how to use it, its syntax and logic. Start with the SAS help and work from there.

http://documentation.sas.com/?docsetId=proc&docsetTarget=p1im5eq2oxakk5n1gr3jl7ruc8a0.htm&docsetVersion=9.4&locale=en

Re: Tweedie CDF

art297 — Mon, 16 Apr 2018 13:10:38 GMT

@nikolasfilbert: I am not familiar with DS2, but found the following structure in the documentation:

proc ds2;
data;
  declare double y;
  method run();
    y=cdf('TWEEDIE', 0.8, 5);
  end;
enddata;

run;
quit;

It ran in SAS UE

Art, CEO, AnalystFinder.com

Re: Tweedie CDF

Rick_SAS — Mon, 23 Apr 2018 13:39:51 GMT

You can run the CDF function in the DATA step. No need to use DS2.

data Tweedie;
do x = 0 to 3 by 0.05;
   y=cdf('TWEEDIE', x, 5);
   output;
end;
run;

title "CDF of the Tweedie(5) Distribution";
proc sgplot data=Tweedie;
   series x=x y=y;
run;

Re: Tweedie CDF

nikolasfilbert — Mon, 23 Apr 2018 17:14:12 GMT

Thank you for your response! But if I want to input x from a column of a table, how should I write it?

Re: Tweedie CDF

Rick_SAS — Mon, 23 Apr 2018 18:02:59 GMT

If the SAS data set 'HAVE' contains a variable named 'X' that contains the points at which you want to evaluate the CDF, you can say

data Tweedie;
set HAVE;
y=cdf('Tweedie', X, 5);
run;