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

How to construct the confidence interval of estimated parameter of normal distribution by Hessian matrix in Maximum Likelihood Estimation?

I want to estimate the unknown parameter of normal distribution by MLE of my data set of weight of new born babies of Nepal Demographic Health Survey. I want to construct confidence interval of...

09 October 2019 4,324 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

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

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 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's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

How optimize the Size Exclusion Chromatography?

Hello! I'll do a size exclusion chromatography, but I only have an open column, and I'll perform the peptide extraction from yeast, using buffer lysis (sodium phosphate 50 mM/NaCl 30 mM/DNAse and...

01 March 2021 2,215 2 View

What SPSS analysis should I run with one IV (with two levels) and two DVs?

Hi, I am trying to figure out which test would be most appropriate to run for the following question: Is there a difference in task blood pressure between smokers and non-smokers? There are two...

01 March 2021 8,235 2 View

No title

01 March 2021 3,905 5 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

Is it necessary to report effect size (ES) in statistics of biomedical research given that we already report p values routinely?

Pls share your thoughts

01 March 2021 7,330 4 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

VIF very high, but correlation is low and coefficient is significant. Which one whould I choose?

Hello. I have a question whether if my coefficients (statistically significant) would be valid when VIFs are really high. In my model, there are independent variables(IV), moderating variables...

26 February 2021 956 13 View