search for: mzodet

...entages in the same tables....anything similar to crosstabs in S? Marc W. Zodet, MS Health Statistician Center for Cost and Financing Studies Division of Statistical Research and Methods 2101 East Jefferson Street, Suite 500 Rockville, Maryland 20852 Phone: 301-594-7072 Fax: 301-594-2166 E-mail: mzodet@ahrq.gov <mailto:mzodet@ahrq.gov> [[alternate HTML version deleted]]

...hese other programs. Typically, I provide relatively thorough project documentation in my program files so that if someone else inherits them they can pick-up on them quickly. Thanks. Marc Marc W. Zodet, MS Health Statistician Agency for Healthcare Research and Quality Rockville, Maryland 20841 mzodet@ahrq.gov [[alternate HTML version deleted]]

...c W. Zodet, MS Health Statistician Agency for Healthcare Research and Quality Center for Financing, Access, and Cost Trends Division of Statistical Research and Methods 540 Gaither Road, Room 5058 Rockville, Maryland 20850 Phone: 301-427-1563 FAX: 301-427-1276 E-mail: <mailto:mzodet@ahrq.gov> mzodet@ahrq.gov [[alternative HTML version deleted]]

How do I rotate 3D plots/surfaces generated by either cloud or wireframe? Thanks. Marc Marc W. Zodet, MS Health Statistician Agency for Healthcare Research and Quality [[alternative HTML version deleted]]

...ly different and I'm trying to understand the differences between the two packages (approaches) so I can explain why the final terms might be different. Thanks for your help. Marc Marc W. Zodet, MS Health Statistician Agency for Healthcare Research and Quality E-mail: <mailto:mzodet@ahrq.gov> mzodet@ahrq.gov [[alternative HTML version deleted]]

How do I go about generating a WEIGHTED mean (and standard error) of a variable (e.g., expenditures) for each level of a categorical variable (e.g., geographic region)? I'm looking for something comparable to PROC MEANS in SAS with both a class and weight statement. Thanks. Marc [[alternative HTML version deleted]]

...det, MS Senior Health Statistician Agency for Healthcare Research and Quality Center for Financing, Access, and Cost Trends Division of Statistical Research and Methods 540 Gaither Road, Room 5058 Rockville, Maryland 20850 Phone: 301-427-1563 FAX: 301-427-1276 E-mail: <mailto:mzodet@ahrq.gov> mzodet@ahrq.gov [[alternative HTML version deleted]]

What is the best way to sort a dataframe? For example, how would I go about sorting a dataframe (with variables V1-V5) by ascending V1, V2 and descending V3 while retaining V4 and V5. Also, is there a relatively easy way by which to re-order my columns? Thank you for your time. Marc Marc Zodet [[alternative HTML version deleted]]

I'm attempting to select a model using stepAIC. I want to use a forward selection procedure. I have specified a "scope" option, but must not be understanding how this works. My results indicate that the procedure begins and ends with the "full" model (i.e., all 17 independent variables)...not what I expected. Could someone please point out what I'm not

I'm attempting to use stepAIC to select a model through a forward procedure. I want to consider up to all 3-way interactions. I've attempted to use the following code: m2.Fwd3way <- stepAIC(m1.Ionly, direction="forward", scope=list(upper=~(var1 + var2 + var3 + var4)^3, lower=~1)) When I submit this the trace indicates that only 2-way

svymean w/ svyby is working for me... > svyby(~visitcnt, ~agegrp3.f, svymean, design=svydes) agegrp3.f visitcnt se.visitcnt 18-44 18-44 8.755552 0.4953235 45-64 45-64 10.131555 0.5347806 65+ 65+ 9.588802 0.4323629 svyquantile is working for me... > svyquantile(~visitcnt, quantiles=c(.25, .5, .75), ties="rounded", design=svydes) 0.25