search for: kirschenbaum

...e are any general rules for calculating skew given a set of quantiles, mean, and sigma. I am currently thinking of trying polynomial fits on the QQplot using the raw data I have and then empirically trying to derive a relationship between the quantiles and the skew. Thank you for any ideas. Leif Kirschenbaum Senior Yield Engineer Reflectivity, Inc. (408) 737-8100 x307 leif at reflectivity.com

...(DF$TS[DF$abc==abclist[i]],na.rm=TRUE) } maxTSdf<-data.frame(device=I(abc),maxTS=maxTS ) DF<-merge(DF,maxTSdf,by="abc",all.x=TRUE) DF<-Df[DF$TS==DF$maxTS,,drop=TRUE] DF$maxTS<-NULL This seems a bit lengthy for such a simple task. Any simpler suggestions? -Leif K. Leif Kirschenbaum Senior Yield Engineer Reflectivity, Inc. (408) 737-8100 x307 leif at reflectivity.com

...was unable to cure by re-formatting the source worksheet. I have had to resort to using the gdata package which runs a Perl script "xls2csv.pl", which converts an Excel spreadsheet to CSV, for a few Excel spreadsheets which exhibit the particular anomalies preventing use of RODBC. Leif Kirschenbaum Senior Yield Engineer Reflectivity, Inc. (408) 737-8100 x307 leif at reflectivity.com > Message: 21 > Date: Mon, 9 Jan 2006 18:06:49 +0100 > From: "Fredrik Lundgren" <fredrik.bg.lundgren at bredband.net> > Subject: Re: [R] "Missing value representation in Excel be...

...hat-linux-gnu" $arch[1] "i686" $os[1] "linux-gnu" $system[1] "i686, linux-gnu" $status[1] "" $major[1] "2" $minor[1] "0.0" $year[1] "2004" $month[1] "10" $day[1] "04" $language[1] "R" -Leif S. Kirschenbaum, Ph.D. Yield Integration Engineer Reflectivity, Inc.

...n R insert plots into an existing PowerPoint presentation? (actually, I'd copy last week's presentation and then update with new plots) I'll guess that it cannot, as there probably is not a Microsoft supplied interface (ODBC or otherwise) with PowerPoint as there is with Excel. -Leif Kirschenbaum, Ph.D. Sr. Yield Integration Engineer (I'm a physicist) leif at reflectivity.com

...gt; oplabel<-'Development Lab' > expr.label("SPC Chart for") I then use exprtitle in: plot(1:10,title= if(plotnum==1) parse(text=exprtitle) else NULL) However: this code seems convoluted and ungainly I don't always get the results I want Any suggestions? Leif Kirschenbaum Senior Yield Engineer Reflectivity, Inc. (408) 737-8100 x307 leif at reflectivity.com

...tringent enough confidence level to avoid Bonferroni problems. I have also tried pairwise.t.test() with the Holm method for p-value adjustment, however I don't see that pairwise.t.test() has a functionality to accommodate my M measurements arrangement. Thank you for any suggestions. Leif S. Kirschenbaum, Ph.D., PMP, CRE Design Reliability Product Reliability Space Systems/Loral 3825 Fabian Way M/S H-21 Palo Alto, CA 94303 650-852-6580

...ot;") if (length(last.warning[[i]])) { temp <- deparse(last.warning[[i]]) out <- paste(out, "in:", temp[1], if (length(temp) > 1) " ...") } cat(out, ..., fill = TRUE) } } Leif Kirschenbaum Senior Yield Engineer Reflectivity, Inc. (408) 737-8100 x307 leif at reflectivity.com

...<- x2 * (x >= 0) mylm <- lm(y ~ x.1 + x.2 + x2.1 + x2.2) some coefficients are dependent on N1 data points (and their noise) and other coefficients depend on N2 data points (and their noise). (and I don't think lm would given me an aswer with such bifurcated Sincerely, Leif S. Kirschenbaum, Ph.D., PMP, CRE * In reality I will perform both quadratic and linear fits on N1 and N2, compare MSEs of the quadratic vs. linear on N1 to determine the best fit for N1 points and similarly on N2. The situation is that I am measuring many instances of an object (~16,000 devices per wafer) whose...

violating.runs I read from the news cran.r-project.org/doc/Rnews/Rnews_2004-1.pdf that the criteria for the violating is 5 but 1)I cannot find "5" in the code of the function. Where is the "5" ? 2)What is the easiest way to change it ? 3)Is there any more criterias made somewhere ? Yours sincerelly, Tommi Viitanen

...antity of the (unsmoothed) time-domain signal, and its normalized (smoothed &/or tapered) power spectrum. I hope this helps, wasn't to long, and that my weak editing skills did not make to grand an appearance. Regards, KeithC. Message: 30 Date: Tue, 31 Jan 2006 13:02:03 -0800 From: Leif Kirschenbaum <leif at reflectivity.com> Subject: Re: [R] How do I "normalise" a power spectral density To: r-help at stat.math.ethz.ch, Tom C Cameron <bgytcc at leeds.ac.uk> Message-ID: <200601312102.k0VL29fS003509 at hypatia.math.ethz.ch> Content-Type: text/plain; charset=iso-8859-1...

I have done a fair bit of spectral analysis, and hadn't finished collecting my thoughts for a reply, so hadn't replied yet. What exactly do you mean by normalize? I have not used the functons periodogram or spectrum, however from the description for periodogram it appears that it returns the spectral density, which is already normalized by frequency, so you don't have to worry about

I feel that as long as people continue to provide help on r-help wikis will not be successful. I think we need to move to a central wiki or discussion board and to move away from e-mail. People are extremely helpful but e-mail seems to be to always be memory-less and messages get too long without factorization of old text. R-help is now too active and too many new users are asking

Readers of this list might be interested in the following commenta about R. In a recent report, by Michael N. Mitchell http://www.ats.ucla.edu/stat/technicalreports/ says about R: "Perhaps the most notable exception to this discussion is R, a language for statistical computing and graphics. R is free to download under the terms of the GNU General Public License (see http://www.r-project.