cat.b41's articles:

Items(56) /6 Next >> Last >|

Have these pharma companies biostatisticians in France ? 0 23 (11/8/2011 11:30:24 PM) comp.soft-sys.sas Hi there, This question is a bit out of scope of this list, so, please, answer to me in private rather than to the whole list. I'm after a new job as a clinical biostatistician (Greater Paris area, France) an... cat

PROC MIXED - Test of interaction centre x treatment when random 0 22 (5/31/2011 3:43:06 PM) comp.soft-sys.sas Hi there, I need to fit a mixed-effect 3-way ANCOVA model and test whether the interaction centre * treatment is significant. Model 1: change = baseline + trt + stratum + centre + centre * trt + error. Model ... cat

PROC MIXED, option DDFM = SATTERTH 0 24 (5/5/2011 9:36:45 PM) comp.soft-sys.sas Hi there, I need to compute a fixed-effect ANCOVA of type: Change from baseline = baseline + trt group + error The design in unbalanced and the samples are small. If this was a t- test, the Satterthwaite app... cat

URGENT, TO STAT: ANCOVA w/ 2 contrasts analyses or 2 separate ANCOVAs ? 0 27 (4/12/2011 7:12:22 PM) comp.soft-sys.sas Hi there, I have three treatment groups including two active dose of the investigational drug and a placebo group and we want to compare each dose separately with the placebo. The study is stated positive if a... cat

URGENT - Proc MIXED versus proc GLM in SAS 9.2 0 21 (4/12/2011 7:04:24 PM) comp.soft-sys.sas Dear all, I need to design analyses specifications for a mixed ANCOVA model in a statistical analysis plan and I'm wondering whether there may be differences in the results (ie trt effect significance) when an... cat

Norm-Based Scoring in a multi-country clinical trial 0 218 (11/9/2010 1:27:17 PM) comp.soft-sys.sas Hi there, Sorry in advance for a question that is bit out of scope but I think a lot of people here work in clinical trials. I need to decide how to calculate norm-based scores for a scale in the case of a... cat

TO STAT: Is alpha a conditional probability ? 0 165 (8/23/2010 12:06:06 PM) comp.soft-sys.sas Hi there, In books, the type I error alpha is commonly written as P(H0 rejected / H0 true). Is this just a notation ? Is it really a conditional probability or is alpha equal to P (H0 rejected AND H0 tr... cat

ANOVA-based Intraclass correlation coefficient 0 752 (6/11/2010 6:32:51 AM) comp.soft-sys.sas Hi there, I need to calculate the Intraclass correlation coefficient between series of data measured on the same patients (ratings of a scale by several raters - more than 2). I found that paper "Formin... cat

Sample Size determination for a multiple comparisons to control Dunnett's test 0 754 (5/4/2010 3:25:34 PM) comp.soft-sys.sas Hi there, I need to find out how many patients I need to power sufficiently my primary analysis, which would be a Dunnett's test comparing means of two active trt groups versus a placebo. Does one know ... cat

TO STATS: Does a generalized Dunnet's test exist ? 2 462 (4/29/2010 3:21:10 PM) comp.soft-sys.sas Hi there, I need to compare 2 dose groups to a control group and initially thought to conduct two separate ANCOVAS, controlling for a few covariates in each model. Now, I thought about the Dunnet's test... cat

cat.b41's replies:

Items(42) /5 Next >> Last >|

How to find the positions of a second occurrence of a character 2 19 (8/13/2009 9:01:31 PM) comp.soft-sys.sas Hi I have this string HS851 Advance Statistical Analysis - Jamil Ibrahim -29 = I want to find the position of the second '-' in the string which is colum= n 52 thanks = = Dr. Jamil Ibrahim, Ph.D. Scient... jibrahim1 (47)

Re: Empty Lines inside the data set 1 22 (8/13/2009 11:04:32 PM) comp.soft-sys.sas I think you do not need to add the empty lines in the dataset, however, it is necessary to add a variable to group rows as your will expect, e.g. grpflg seq value 1 1 300( 67) 2 2 280 ( 34) ... tonyyangsasl (15)

URGENT - Kaplan-Meier curves, 95% CI and statistically significant difference 2 25 (9/13/2009 9:21:09 AM) comp.soft-sys.sas Hi there, I have limited experience in time-to-event data analysis. I requested, in a statistical analysis plan for an observational study, to plot the Kaplan-Meier curves for 2 groups of patients on a single ... cat.b41 (102)

How to make a program tell how long it took to run it 5 23 (9/13/2009 2:55:45 PM) comp.soft-sys.sas Hi, I have a program and would like to develop something so that the SAS log can tell when the running of the program stated and when it ended, and how long it took to run the program. I would present the resul... rune (483)

Re: URGENT - Kaplan-Meier curves, #2 1 19 (9/16/2009 5:19:14 PM) comp.soft-sys.sas --- On Sun, 9/13/09, cat.. wrote: > From: cat.. > Subject: URGENT - Kaplan-Meier curves, 95% CI and statistically significant difference > To: SAS-L@LISTSERV.UGA.EDU > Date: Sunday, September 13... stringplayer_2 (1472)

Re: Appropriate model for intra-class correlation coefficient #2 1 26 (10/5/2009 6:27:32 PM) comp.soft-sys.sas Cat, With only a single assessment from any one rater (one child, one parent of that child), I don't see how you can estimate a random rater effect. Assuming there might be some sort of generation effect (par... stringplayer_2 (1472)

Convert month variable from character to numeric using 9.1 2 23 (10/7/2009 12:09:17 AM) comp.soft-sys.sas i have a dataset with month stored as a separate variable as mmm. (JAN). I need to convert this to a numeric field so that i can use the mdy function. Can someone please help me convert the month field to nume... jencline10 (6)

Re: Appropriate model for intra-class correlation coefficient #3 1 26 (10/7/2009 4:51:24 PM) comp.soft-sys.sas --- On Tue, 10/6/09, cat.. wrote: > From: cat.. > Subject: Re: Appropriate model for intra-class correlation coefficient > To: SAS-L@LISTSERV.UGA.EDU > Date: Tuesday, October 6, 2009, 10:55 PM > On Oct 5, 7:... stringplayer_2 (1472)

Re: storing file metadata in a dataset 1 31 (1/13/2010 4:11:28 PM) comp.soft-sys.sas On Tue, 12 Jan 2010 22:42:03 -0800, cat.. wrote: >Hi folks ! > >I'm wondering whether it is possible to store file metadata (any type >of file) in a SAS data set. I already wrote a step for storing the >file ... Chris.Brooks (87)

%aetab for multi-level AE reporting 1 34 (11/3/2011 6:05:43 PM) comp.soft-sys.sas I have a new macro named %aetab for multi-level AE reporting. It can currently cope with nine levels. Five obvious levels are "System Order Class", "High Level Group Term", "High Level Term", "Preferred Term" a... rolandberry (1872)