Statistical Modeling

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Questions related to Statistical Modeling

Looking for PhD Supervisor in food security analysis?

I am looking for a professor to supervise my PhD topic - statistical modelling in food security status of the population

02 February 2015 1,535 0 View

If your data is strongly non-linear, then how should be it treated?

I have data of biological parameters and physico chmecial features which show show strongly non-linear relatiosnhip. How should I treat these type of data... Is Genralized linear model stat. test...

02 February 2015 1,178 14 View

Is there a good way to "normalize" electoral volatility?

I'm specifically interested in electoral volatility. It measures the aggregate change in votes across all parties between two elections. But what if the distance between elections (in years)...

02 February 2015 6,106 2 View

Can someone suggest the Empirical bayes estimate of Mean and Variance formula for Normal case proposed by Morris ?

Empirical Bayes estimate of Mean and Varriance formula proposed by Morris for Normal case

01 January 2015 3,836 4 View

How to appropriately account for errors when fitting a mathematical model to summary data which represent percentiles (e.g. median) of a histogram?

The data provided are percentiles (median, 75th and 90th) from several histograms. The number of observations comprising each histogram is known. The shape of the data distribution in each...

01 January 2015 6,973 5 View

Can the value of A be calculated in the function y = ax + b, if B is an unknown variable instead of a constant?

Let ( x(i), b(i), y(i) ) be a 3-tuple of real numbers. i=1,...,n can be interpreted as discrete time, meaning that x(i+1) occurs after x(i).x(i) and y(i) are observable, whereas b(i) is not...

01 January 2015 8,183 4 View

Does anybody know that from where we can get predictor variable for SDSM?

does anybody know that from where we can get predictor variable for SDSM?because http://www.cics.uvic.ca/scenarios/index.cgi?scenarios...is not available anymore...

01 January 2015 6,430 3 View

What is the difference between the mechanistic and statistical modeling?

I am trying to develop a mechanistic model integrating satellite images, can you help me to understand these type of modilisation. thank you very much

14 December 2014 9,461 13 View

How do I determine the significance of input data series with the output?

What appropriate method (may be statistical) can be used to find the statistical significance of a particular input data series with the observed output? I am concerned about the non-linear data...

14 December 2014 2,508 5 View

What is the best method for assessement of model?

I'm totally confused about many parameters for assessing the model.

12 December 2014 7,780 0 View

Does anybody know how to perform an ANOVA in an augmented design and obtain the significance of the GxE factor?

I need to obtain the significance of the GxE factor of the ANOVA performed with multiple environments (n=8) in an augmented design with data adjusted with BLUPs (Best Linear Unbiased Predictors).

12 December 2014 3,738 6 View

How do you test for autocorrelation in a random effects model?

Using gretl, I run my model as RE. From there, how do you test for autocorrelation?

12 December 2014 4,379 3 View

Meta analysis: How to calculate the impact of unpublished data on result of analysis?

While considering studies for inclusion into a meta analysis on a particular subject, some studies (mostly with negative results) that are unpublished may remain un-included, even after best...

12 December 2014 2,721 22 View

How can I correlate the amount of rainfall to a catchment basin with respect to three rain gauges, depending on the typhoon track and its duration?

I'm working on a flood model of an urban area. My problem is, I want to input rainfall data of a Typhoon with respect to three different gauges. I know that these gauges will give different data...

12 December 2014 7,451 9 View

What other techniques or tools are available in assisting the determination of the number of factors to retain in Exploratory Factor Analysis?

From my reading and understanding, the Kaiser's criterion of eigenvalue greater than 1 and finding 'elbow' in the scree plot are two common practices (each with argument). Also, there is Parallel...

12 December 2014 1,774 15 View

How can I optimize the random effect structure in a GLMM?

I am using generalized mixed models using glmer function of the “lme4” package. Glmer() always uses Maximum Likelihood (ML) rather than REstricted Maximum Likelihood (REML)...

12 December 2014 8,348 9 View

What are the possible ways to build and interpret the nested model with multi-group analysis in AMOS program?

The objectives of my ongoing work are (1) examining construct validity (2) factorial validity, and (3) cross validation with multiple independent samples in a single country context. For...

12 December 2014 3,511 2 View

What is the difference between the mechanistic and statistical modeling?

I am trying to develop a mechanistic model integrating satellite images, can you help me to understand these type of modilisation. thank you very much

12 December 2014 2,561 11 View

How do I determine the significance of input data series with the output?

What appropriate method (may be statistical) can be used to find the statistical significance of a particular input data series with the observed output? I am concerned about the non-linear data...

12 December 2014 3,032 6 View

Is a probability sample required in inferential statistical analysis?

Please cite works of noted authorities on the subject.

12 December 2014 8,298 27 View

What is good approach for changing parametric model to nonparametric modeling for NHPP?

Will it be helpful to estimate better reliability?

12 December 2014 2,813 0 View

I am using proc mixed in SAS for mixed model analysis. My data is not normally distributed. How much non-normality can I get away with here?

Response variable is sub domains of a survey and so each measurement is between 0 and 8 (each is the sum of responses to 2 of the survey questions). This survey was taken at 4 different time...

27 November 2014 4,682 10 View

I am using proc mixed in SAS for mixed model analysis. My data is not normally distributed. How much non-normality can I get away with here?

Response variable is sub domains of a survey and so each measurement is between 0 and 8 (each is the sum of responses to 2 of the survey questions). This survey was taken at 4 different time...

11 November 2014 9,466 11 View

Help with analysing several dummy variables in SPSS Multiple Regression?

I would like to know what I'm doing wrong, please. I've recoded two ordinal variables into dummy variables (one now has 3 variables and the other has 9). I need to enter them into the SAME...

11 November 2014 424 15 View

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