statistic

  1. S

    Getting p-value for rsquared bootstrap in R

    I've been trying to get the pvalue of my samples from a bootstrap rsquared test in R. I'm not very good with statistics so could someone please take a look at my below code and point me in the right direction with regards to how I can extract the p-values per sample? # Bootstrap 95% CI for...
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    NLS with real data

    I have data that has length, age and density (counts) and i am trying to model this data to see if density at birth has an influence on length. Since my response variable reaches a plateau i know i will need a non linear model. Can anyone help me with how to go about fitting a non linear model...
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    OLS Regression Output interpretation (really urgent)

    Hi guys, I have the following output and I really need your help with this: The questions are: a) Regressor X3 is a dummy variable (X3 = 1 if individual belongs to group 1). What interpretation can you give to the corresponding coefficient? b) The dependent variable was generated by the...
  4. S

    Extrapolation - Getting info of a population from a sample

    Hello, I'm working on a problem where I have 30% of a full dataset and I have to estimate the generalization error. To be more precise, let's say I have the information of the transactions of the clients of a bank which has 30% of the countries market. I can easily get the mean, standard...
  5. S

    Fixing demographics behaviour

    Currently collecting employment/working satisfaction data from survey at different countries. Same set of questions is used. I have come across that people from some countries tend to be more optimistic/pessimistic than others. How can I take their answering behaviour into consideration when...
  6. S

    Fixing different demographics behaviour on survey data

    Currently collecting employment/working satisfaction data from survey at different countries. Same set of questions is used. I have come across that people from some countries tend to be more optimistic/pessimistic than others. How can I take their answering behaviour into consideration when...
  7. N

    Computational Statistics: Variance reduction

    Hi. In this exercise, I should do the following subquestions for θ=P(X+Y≥15) where X∼Exp(0.5) and Y∼Exp(0.25) both X and Y are independent. Implement the following estimators for θ: (i) The raw simulation estimator. (ii) The antithetic estimator. But the exercise here restrict the methods...
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  9. A

    What Stats should I do?

    I have data looking at the number of different prey species and the number of different predator species that visited a waterhole and I'm categorizing by time, so eg. 3-6am : 5 prey, 2 predator 6-9am: 10 prey, 1 predator ect. I've tried doing a 2 way anova, and chi squared test but I dont...
  10. J

    Really, Really, Really need help

    I'm not a statistics student and know basic, basic principles. The following question is for my research project. Mass (g) +/- 0.01 grams Drop height (centimeters) +/- 3.00 Shell 53.47 45 No crack 56.78...
  11. M

    Statistic subject test question

    Hello everyone! Merry Christmas in advance! Here I just faced with a little issue of my son that I have no idea how to solve and he obviously neither. I just want to understand how to solve this tasks so I can explain to him and if you can help me I will be more than appreciated. The tasks are...
  12. H

    Help with my research project

    Hi everyone, Currently I am working on a research project in the Netherlands, while studying Pharmacy. My study consists of 2 groups of different sizes. group 1: 50 patients (patients using the drug metformin) and group 2: 100 patients (control group, non diabetic). I want to investigate if...
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    How to get the odds of an event, based on its linear regression analisy?

    As the title say. I have made a linear regression analisy of an event, and I got the concentration of probabilities at a given space of the Graphic (X, Y) ... so how to extract the odds of the event to happen by this linear regression analisy? This is the grahic:
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    Correlation Coefficient.

    1) If the correlation coefficient between two random variables X and Y is 0.5, then the correlation coefficient between 2X-4 and 3-2Y is? a. 1 b. 0.5 c. -0.5 d. 0 1) If the correlation coefficient between two random variables X and Y is 0.3, then the correlation coefficient between (2X+3)/5...
  15. E

    Probability HW help

    I need help with these problems. I worked them out, got answers, and checked the back of the book to see if I got them correct. A pair of six-sided balanced dice are rolled. What are the probabilities of getting the sum of the face values as follows? (a) 8 (b) 6 or 9 (c) 3, 8, or 12 (d)...
  16. M

    Weekly Sales - statistical analysis

    I need to analyze sales on hourly level, and compare hourly sales of one day with same day in last 10 weeks. Following is the data set: -Day -Hour -Sales Trend charts are helpful in analyzing 2 to 3 days of data, more than this information don't have good presentation. Please suggest which...
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    Importance of vars in linear regression (R)

    I have a question that is and R question and a statistical question: I am analysing sales of a retailer. These sales are related to some vars: var1, var2, var3.., varN Most of the vars are continuos. I want to analyze the relationship between sales and the vars. I have made a linear...
  18. M

    Survey uncertainty with a given population proportion

    Hello! I have to estimate the uncertainty of the result of a survey where there sample size was defined to have an uncertainty of 2.76%, based on p a p value of 0.5. The 2.76% error is calculated assuming a 50% population proportion, which is a worst case scenario assumption: size...
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    Analysis of data - how to find the most relevant factors

    Solved. Sorry... You can delete it.
  20. J

    How to calculate Huber Estimator

    Hi, I would like to understand how to compute the Huber estimator. As I read, the objective function of Huber estimator is minimizing $\rho (x_i - \theta)$, where the $\rho (t) = 1/2 t^2$ when $|t| < k$ and $\rho (t) = k|t| - 1/2 k^2$ when $|t| > k$. Anyone know how to compute this...