search for: birthweight

...t that certain date. SST_date SST 2008-01-01 22.2 2008-01-02 21.8 2008-01-03 22.8 2008-01-04 22.9 2008-01-05 23.1 2008-01-06 23.2 ... ... now, I would like to add a column that shows the mean SST over the last (e.g.) 60 days (for that specific date). My biological question is, whether the birthweight of an animal at a specific birthdate changes due to the SST over the last 60 days before birth. (SST is an indicator for food abundance - if food is scarce, mothers can't feed much and hence, pups are born lighter!?) Up to now, I can only show, whether the SeaSurfaceTemperatures on the birthdat...

...y ~ A*x. But my original line is gone now -- there's no effect of x overall left in the model, just the 4 sub-models -- so this isn't nested in the same sense that, say y ~ a and y ~ a + b and y ~ a + b + a:b are when everything is a factor. (But I think it may be the same as part of the birthweight, sex, and age example in the demo, where it goes from birthweight ~ sex + age to birthweight ~ sex + age + sex:age and you get 2 slopes instead of 1.) What I'm not quite sure of is whether it is valid to compare my two models using anova, and if not, how I can compare them. I am interested s...

...) command after the plotting commands. I have R running under WinXP . Here an example of malfunctioning code. postscript("ex6_pic1.eps", width =6, height = 9, horizontal = F, onefile = FALSE, paper = "special") par(mfrow=c(2,1)); par(mfg=c(1,1)); plot(bidia,weight,xlab="birthweight",ylab="head diameter"); abline(birth.lm1$coefficients); par(mfg=c(2,1)); plot(abdcir,weight,xlab="birthweight",ylab="abdomnial circumference"); abline(birth.lm2$coefficients); dev.off() Hope you can help me. Best Andreas --- [[alternative HTML version de...

...y ~ A*x. But my original line is gone now -- there's no effect of x overall left in the model, just the 4 sub-models -- so this isn't nested in the same sense that, say y ~ a and y ~ a + b and y ~ a + b + a:b are when everything is a factor. (But I think it may be the same as part of the birthweight, sex, and age example in the demo, where it goes from birthweight ~ sex + age to birthweight ~ sex + age + sex:age and you get 2 slopes instead of 1.) What I'm not quite sure of is whether it is valid to compare my two models using anova, and if not, how I can compare them. I am interested s...

Hi When I use the read.table function with header = T, I notice that it gives me the variable names along the top as I expect. But, when I then attempt an analysis, e.g. regression, it doesn't recognize the variable names. Am I missing a step. Thank you David [[alternative HTML version deleted]]

...Premature death 8644.0 7897.0 9390.0 5034.0 6099.0 2 Sullivan Poor or fair health 15.0 9.0 22.0 11.0 16.0 3 Sullivan Poor physical health days 3.5 2.5 4.5 2.7 3.5 4 Sullivan Poor mental health days 3.9 2.6 5.2 2.6 3.3 5 Sullivan Low birthweight 7.7 7.0 8.4 6.1 8.0 6 Sullivan Adult smoking 29.0 22.0 37.0 15.0 20.0 I'd like to graph high and low for "Premature death" for each of the three counties, with 3 vertical line segments, one connecting those two points for each county. I can get t...

...33 AM To: r-help at stat.math.ethz.ch Subject: [R]: z-scores for different factor levels Hi there. I am trying to generate z-scores for a variable according to it's factor level, leaving this result in the original dataframe. ie. standardised birth weight for gestational age in weeks. BWT is birthweight GEST is gestational age in weeks (equivalent to the factor level) I can generate the factor level mean & SD using tapply tapply(BWT,GEST,mean) etc. but this creates a new array of means & SDs. - Can anyone suggest how I can slot these means & SDs by factor level straight back into the...

>From owner-r-help at stat.math.ethz.ch Wed Jan 9 10:08:44 2002 > >Does anyone know how to access/list the value labels stored in a SPSS .sav >file? >At the moment I can read in variables using read.spss() (foreign package), >but have to power up SPSS to check value labels. > >Stuart There may be a solution to this in R, and I would love to hear it, but I was just faced

...33 AM To: r-help at stat.math.ethz.ch Subject: [R]: z-scores for different factor levels Hi there. I am trying to generate z-scores for a variable according to it's factor level, leaving this result in the original dataframe. ie. standardised birth weight for gestational age in weeks. BWT is birthweight GEST is gestational age in weeks (equivalent to the factor level) I can generate the factor level mean & SD using tapply tapply(BWT,GEST,mean) etc. but this creates a new array of means & SDs. - Can anyone suggest how I can slot these means & SDs by factor level straight back into the...

...d West Nile. Fever) in Andara Pradesh, India U. Suryanarayana Murty, Indian Institute of Chemical Technology Generating a Connected Weighted Graph for the Analysis of HIV Data Using CART 5 George Towfic, Clarke College Umbilical Cord Length, Other Placental Growth Measures, Placental Weight and Birthweight Carrie Salafia, Columbia University School of Public Health Experiences when applying MARS and CART in the Disciplines of Biodiversity, Conservation and Wildlife Modeling: The GIS Link Falk Huettmann, Institute of Arctic Biology, University of Alaska-Fairbanks CART for Outcome Predictions in Cli...

Hi I have recently been analyzing birthweight data from a clinic. The data has obvious defects in that there is digit preference on certain weights making them overrepresented. This shows as spikes in the histogram on certain well rounded weights like 2, 2.5, 3, etc. I would like to show this to government officials but can't figure out...