Thanks mostly to 2IV Regression instructions posted at a U. of S. Florida website, I have successfully duplicated the Toolpak output, including the standard errors of the IVs. However, I cannot for the life of me figure how to calculate the error of the Intercept. Can anyone walk me through this? I have attached my data, model...

Error of the Intercept with 2 Idependent Variables]]>

I understand how to calculate the standard deviation for the difference between two means for normally distributed data, but please can you tell me if the same formulae should be used if both sets of data are half-normally distributed (i.e. each set of data being half a bell curve). Should I still use the attached formula? (I took a screenshot of the normal formula for standard deviation of the difference of two means)

Many thanks!

mnbvmnbv

p.s. I've tried googling for many hours...

Confidence interval of difference between two means (half normal distribution)]]>

I have a dataset with 98 independent variables (or features in the multivariate machine learning case), 1 dependent variable (or target) with a N = 54.

Now I would like to explore which variables are most "assoicated" with the target variable. As I have a lot of features, I would like to sort out less important features.

I the univariate case I would first run a principal component analysis. Subsequently, I would run univariate regression...e.g. stepwise regression .

In...

Need advise regarding the use of univariate vs multivariate statistics]]>

I have measured ROS production using enzymatic assay for 5 genotypes, 20 reads/assay and 12 reps. The obtained data produced a bell-like curves. Some people just show the peak activity and analyse it. I would like to analyse whole kinetics of assay. Any suggestion? which method and packages in R can be the best choose.

Regards,

JaVaD]]>

I understand that a confidence interval calculated CI = mean...

Help - translating confidence interval into probability]]>

I'm evaluating two different techniques of identifying the representation of the motor network within the brain. Both techniques identify the center of gravity of the motor network in MRI coordinates based on physiological output. So what I have is 8 datasets of coordinates for both techniques. The 2 techniques clearly identify different centers of gravity and I would like to quantify this. However, it is hard to determine whether the coordinates/distances are normally distributed...

Statistical analysis of 3D coordinates and distances]]>

I have a latin square design with

- 3 treatment levels ( control, treatment 1&2) between groups
- 4 Dose levels (drug X) which was administered to all the subjects

Is there any way to normalize the time scale (since drug X was randomly administered after every 3 days to the...

Latin Square design time normalization]]>

I am doing a chi square test for categorical variables in a very large sample size. Is there any alternative to the Chi-Square Test (besides the cramer'S V test for associations )?

Thanks,]]>

I want to buy a new processor to run stata code but i am stuck with 2 processors and I am not sure which one to choose. I have read here& here. They have recommended a processor with multy threading and some other technical staff which I don't understand. I have Intel...

Need help for choosing a right CPU for STATA.]]>

I have a study with multiple continuous dependent variables, one dichotomous independent variable, and several dichotomous covariates. I initially thought a One-way MANCOVA would be appropriate, but it appears that the multiple dichotomous covariates violates the assumptions of the test. Any suggestions on what test would be appropriate?]]>

Here are the question and what i had done on the intercept.

]]>

Please help. I need to know

-a standard 52 deck of cards

-each player are dealt 13 cards

Is it harder to get 3 of a kind, or a 3 card straight flush?

Is it harder to get 4 of a kind, or a 4 card straight flush?

I know I am asking for answers, but I really am not a statistics trained person. I appreciate if someone could help. thank you.

Nat

I also apologize if this is not the appropriate place for this question. I am unfamiliar with this forum.]]>

Intraclass Correlation Coefficient (ICC), Coefficient of Repeatability (CoR), Coefficient of Variation (CoV), graphical method through...

Test-retest repeatability]]>

That said, i’m trying to determine how to weight keywords from a data set of biographies so as to determine what the people do for work.

The data set comprises the biographies of attorneys. And in those biographies, certain keywords will be indicative of particular legal practice areas. For instance, the terms “private equity”, “M&A”, “acquisitions”, are indicative of an attorney the practices in the private equity sector. As another...

Need direction on weighting/normalizing "keywords" in a dataset]]>