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Cyril_FR
‎09-17-2015
  • 14 Posts
  • 0 Likes Given
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Re: Hodges-Lehmann Estimator

by Calcite | Level 5 in SAS Health and Life Sciences
‎09-17-2015 09:06 AM
‎09-17-2015 09:06 AM
Hello All, I'm also after the Hodges-Lehmann estimator (and CIs) for one treatment but the link provided above does not work anymore, any recommendation? Thanks in advance, Cyril   ... View more

Re: Zelen's test for homogeneity of odds ratio

by Calcite | Level 5 in SAS Procedures
‎06-14-2013 09:37 AM
‎06-14-2013 09:37 AM
Yes it wasn't very clear... Without the MC option in the PROC FREQ, it matches the results coming from the PROC STRATIFY (with EX option) but I had to input only part of my dataset otherwise I got an error message saying that the sample size was too large (actually this is the point for using the Monte Carlo estimation: sparse data and large sample size... and in the end, for the Zelen's test, it's only available in the PROC STRATIFY). FYI I have already contacted the Cytel support, I will let you know the outcome. Thanks again and Have a great weekend! Cyril ... View more

Re: Zelen's test for homogeneity of odds ratio

by Calcite | Level 5 in SAS Procedures
‎06-14-2013 05:57 AM
‎06-14-2013 05:57 AM
Dear Steve, FYI we've got SAS v9.2 TS level 2M3 installed on the server. With EQOR, I got exactly the same note: NOTE: PROC FREQ computes the exact p-value, not a Monte Carlo estimate, for Zelen's test. Thanks for your help. Best regards, Cyrille ... View more

Re: Zelen's test for homogeneity of odds ratio

by Calcite | Level 5 in SAS Procedures
‎06-13-2013 02:02 PM
‎06-13-2013 02:02 PM
Thanks for the prompt response but I've got exactly h x 2 x 2 tables. Concerning the proc freq, I don't understand why the monte carlo estimation is not working for Zelen's test? Concerning the proc stratify, I tried to create a numerical variable for treatment coded (0,1) and I get the same result as with the treatment variable in a character coded ("tio 5","placebo") but slightly different from the character variable coded ("Tio 5","placebo")? Best regards, Cyril ... View more

Zelen's test for homogeneity of odds ratio

by Calcite | Level 5 in SAS Procedures
‎06-13-2013 05:42 AM
‎06-13-2013 05:42 AM
Dear All, My objective is to validate some weird results coming from the PROC STRATIFY (package Statxact v8) for testing homogeneity of odds ratio: if you recode the treatment variable (tpattdcr in the piece of code below) in the input dataset ‘Tio 5’ to ‘tio 5’ you get slightly different p-values for the monte carlo estimate of the Zelen’s test (with my dataset 0.96160 and 0.96200)? PROC STRATIFY DATA=&inds SEED=311875 OUT=&outds; HO/mo; RO tpattdcr; CO censored; STRATUM trial; WEIGHT cnt; RUN; I have been pleasantly surprised when I found out that since SAS v9.2, there is an option in the PROC FREQ to calculate the monte carlo estimate of the Zelen's test (see Base SAS(R) 9.2 Procedures Guide: Statistical Procedures, Third Edition and the piece of code below). Unfortunately when I tried to run the procedure I got an error message saying that the monte carlo estimation is not available for Zelen's test (that contradicts what is mentioned in the SAS help)? proc freq data=&inds; tables trial*tpattdcr*censored; exact zelen / mc SEED=311875; WEIGHT cnt; RUN; Don’t hesitate to contact me if you need more details. Best regards, Cyril ... View more

Re: Power calculation for proportions

by Calcite | Level 5 in Statistical Procedures
‎02-02-2010 05:55 AM
‎02-02-2010 05:55 AM
Thanks DOC ... View more

Power calculation for proportions

by Calcite | Level 5 in Statistical Procedures
‎02-01-2010 11:41 AM
‎02-01-2010 11:41 AM
Hello, I want to ask why the following code is not working: proc power; TwoSampleFreq test =pchi groupproportions =(1 0.80) nullproportiondiff =0 NPerGroup =20 SIDES =1 POWER =. Alpha =0.05; run; invalid input WARNING: The magnitude of the effect is ill-defined in one of the scenarios in the output table. I think that it's due to my assumption that 100% of the patients in the placebo group develop the disease. Is it too strong? Thanks in advance, Best regards, Cyril ... View more

Re: do in a data step

by Calcite | Level 5 in SAS Programming
‎08-07-2008 05:08 AM
‎08-07-2008 05:08 AM
Thank you, it's exactly what i wanted to do. My programs will looks better! Cyril ... View more

do in a data step

by Calcite | Level 5 in SAS Programming
‎08-06-2008 12:14 PM
‎08-06-2008 12:14 PM
Hi, How to do the same thing that below (ie the same column names) with a boucle do? data final4 (drop=_label_); set final3; COL1b=lag(seq1); COL2b=lag(seq2); COL3b=lag(seq3); COL4b=lag(seq4); COL5b=lag(seq5); run; thanks by advance ... View more

Re: Sample size for a logistic regression polytomic multifactorial

by Calcite | Level 5 in SAS Procedures
‎08-06-2008 12:02 PM
‎08-06-2008 12:02 PM
I think that the PROC SAS to do that does not exist yet but i found an article (http://www.childrens-mercy.org/stats/weblog2004/OrdinalLogistic.asp) where there is the formula to calculate the sample size. ... View more

Sample size for a logistic regression polytomic multifactorial

by Calcite | Level 5 in SAS Procedures
‎07-31-2008 12:22 PM
‎07-31-2008 12:22 PM
I have to calculate a sample size for a logistic regression polytomic multifactorial. The ordinal response has 3 modalities (mild, moderate, severe) There are 9 binary (yes/no) variables to include in the model and 1 variable with 3 modalities. Thanks by advance. ... View more

Re: remove the blank line between the titile and talbe

by Calcite | Level 5 in ODS and Base Reporting
‎07-29-2008 08:15 AM
‎07-29-2008 08:15 AM
In order to not have a blank line, instead of using the option bodytitle with title="Table i - Results...", use the ods rtf text="^S={font_size=11pt font_face='Times New Roman' FONT_SIZE = 11pt FONT_WEIGHT = bold FONT_STYLE = italic} Table i - Results..." columns=1; ... View more
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