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Questions related to Applied Statistics
I have calculated the area under a peak for a spectroscopic data. How to estimate the error, since I use only one data (and I have no reference) and I have used integration?
06 June 2014 5,575 13 View
What are entry data for excel,minitab or statistica softwares.
06 June 2014 9,825 1 View
Aside from the wavelet transforms, could another statistic be applied?
05 May 2014 2,213 5 View
Can we say if MAPE is greater than X the forecast is not accurate? Such cut-off points exist for example for the percent relative standard error (PRSE). If a parameter has PRSE>30% it is usually...
05 May 2014 3,552 2 View
This question has multiple aspects: 1) I would like to know how to put a P value on an EC50 shift: "e.g. I have a bradykinin dose response curve in my control group and now I have block eNOS using...
05 May 2014 8,714 1 View
Scientific evidence is a form of evidence that serves to either support or counter-support a scientific hypothesis. This type of evidence is expected to be empirical in nature and commensurate...
05 May 2014 1,350 41 View
I need help to better understand an aspect of marginal structural models (introduced by Robins). I am not clear on why this method requires artificial censoring at the first missing value. For...
04 April 2014 6,996 0 View
Simpson's Diversity index has two forms, one equation for finite populations and one for infinite populations. Which version should I use if working with vegetation % cover values from quadrats? A...
04 April 2014 7,075 10 View
Sometime we might have a non-significant difference between two samples but they are really different inside. For example: color.
04 April 2014 6,479 4 View
I am trying to resolve a problem with count data. At the beginning, I fitted a poisson regression model. However, I got under dispersion in my model. I tried to use a restricted generalized...
04 April 2014 8,003 2 View
Confidence interval
04 April 2014 3,371 10 View
I got significant results after ANOVA test, but when I applied post hoc Tukey's test, I obtained non significant results. I could not reason it out.
03 March 2014 4,928 49 View
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03 March 2014 7,861 3 View
In the optimization process, obviously the precision changes by changing the number of training points. For a special case, I need to make the precision independent from the test repeating number...
03 March 2014 4,417 1 View
Are there templates of mathematical models for such issues? How can I determine what is the sample size of sales processes initially to start mining its data?
03 March 2014 2,730 4 View
Statistics advise on Oral/Dental research areas.
03 March 2014 2,127 1 View
Is there any standard practices are available to use threshold value in the damage identification problems. If anything is there, kindly let me know.
03 March 2014 9,397 5 View
[problem in R]: How can I compute the medians of the rows in the matrix x3; where, e.g. x1
03 March 2014 4,405 2 View
I am attempting to determine the number of factors in an exploratory factor analysis. I conducted a parallel analysis and it suggested that a model with two factors was most appropriate. However,...
02 February 2014 8,408 1 View
In a binary unconditional logistic model that I am working on, one of the variables (let's say X) is a confounder. Removing it is changing the odds ratios (ORs) of several other variables by more...
02 February 2014 652 6 View
The Monte Carlo method of data validation requires large data sets (random numbers) for starter.
02 February 2014 6,955 15 View
I'm working on developing an disease/early warning system for cocoa disease to provide timely forecasts that farmers can use to mitigate potentially damaging events through preventative...
02 February 2014 995 2 View
The applications of the LSA for adjusting values are very wide. My interest is limited here to the field of quantitative measurements and for two peculiar fields of high-accuracy measurements,...
02 February 2014 4,642 1 View
When conducting a meta-analyses, all the works included are rated on the basis of their methodological qualities. Which rates, scales, or criteria should be used? Does anyone have a rating scale...
02 February 2014 10,012 14 View