how to calculate the Hessian matrix from R?

I develop a new probability model . The new probability density function is introduced of Half logistic Weibull distribution having three parameter but i have not no idea how to calculate the...

10 November 2019 9,372 1 View

In modeling of regression analysis there is problem of variation of sample size. How to address such problem?

It is essential for multivariate data analysis.

10 November 2017 9,562 5 View

In multivariate analysis (X1) is 100 sample and (X2) is 80 . How to run multivariate Y on X1 and X2 in logistic regression analysis?

Modeling related question

10 November 2017 9,977 3 View

Kolmogorov-Smirnov test or Shapiro-Wilk test which is more preferred for normality of data according to sample size.?

Kolmogorov-Smirnov test or Shapiro-Wilk test which is more preferred for normality of data according to sample size.?

10 November 2016 10,041 2 View

To use parametric test like as t test, Z test ANOVA test it is necessary for data are random or sampling technique should probability sampling?

To use parametric test like as t test, Z test ,ANOVA test it is necessary for data are random or sampling technique should probability sampling? It is necessary for probability sampling for...

05 June 2016 2,632 3 View

What is correlation matrix? illustrated it with example. Describe its importance in the development of multivariate statistical model?

what is correlation matrix? illustrated it with example. Describe its importance in the development of multivariate statistical model?

08 September 2015 4,246 3 View

Kolmogorov-Smirnov test or Shapiro-Wilk test which is more preferred for normality of data according to sample size.?

01 January 1970 6,430 14 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

What test should I use to compare two or three means, if data is not normally distributed but sample size is > 30 in each group?

I personally feel this as a most confusing question. As per my understanding, if sample size is > 30, and sample is skewed, we can still use paramteric approach, as it will follow Z...

01 March 2021 1,587 6 View

How to classify strictly upper triangular matrices by similarity?

Let F be a field. Consider U, the set of n times n strictly upper triangular matrices in F. For X, Y in U, we call them similar if there exists some S, which is non-degenerate and upper...

01 March 2021 2,957 8 View

Is CD44 degraded in lysosome together with hyaluronan after CD44 mediated endocytosis of hyaluronic acid?

Also when RHAMM binds hyaluronic acid, they get internalized, will RHAMM also be degraded? Or both CD44 and RHAMM will be transferred back to the cell membrane? Asking for breast cancer cell line...

01 March 2021 8,169 2 View

Why is the sum of the elements in a row in a Q matrix equal to zero?

When explaining substitution models, the substitutions are expressed as Q matrix. Why is the sum of the elements in a row zero?

28 February 2021 3,864 3 View

Distribution of particles in metal matrix?

How would define the "good" and "poor" distribution of particles within the matrix. Is there a quantitative solution to assess the distribution of the particles, which then having denotation of...

28 February 2021 7,397 8 View

How to find a correlation between coordinates in a curvilinear coordinate system?

Hello. I have a skewed elliptical coordinate system (I use alternative elliptical coordinates). And I need to determine connections between coordinates in order to fetch a covariance matrix of...

28 February 2021 364 3 View

For modelling epoxy-based matrices (in composites), which model in ABAQUS is the most suitable, Concrete damaged plasticity or Drucker-Prager model?

I am working on developing a micromechanical FE model for predicting kink-band formation in UD composites. To model matrix plasticity, which model, out of Concrete Damaged Plasticity and...

28 February 2021 5,415 1 View

What are the methods used for CNT..?

Respected Professor's i hope you are doing well and happy. i need some information about carbon Nanotubes. before blending the CNT with the matrix the CNT has been introducing in some treatments....

24 February 2021 5,383 5 View

How can I generate random samples from Bingham distribution in R? How can I construct those symmetric matrices?

in the function rbingham(n,A) in R software how can I construct that A (symmetric) matrix?

24 February 2021 3,528 3 View