statistic

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    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...
  2. 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...
  3. 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...
  4. 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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  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. L

    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...
  12. 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)...
  13. 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...
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    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.
  17. 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...
  18. N

    What distribution is better in these situations?

    I'm new in statistics and probability and I'm a little lost about what distribution is better in these situations: If a tumor is malignant or not --> Bernouilli Number of entries in an emergency service during a night, know that on average 20 entries are observed per night. --> Poisson Tumor...
  19. O

    Comparing time lag between two data sets

    Hi, I am trying to compare two data sets available for x number of historical months. These are two different types of claims, i.e. first party claims and third party claims. We know that third party claims will increase if first party claims increase and vice versa, after a lag of few...
  20. T

    HELP - citation model in R

    Hello everyone. I need help with the citation model as explained in This article "Bibliometric tools applied to analytical articles: the example of gene transfer‐related research" The model is expressed as C=KY+S C=cumulative number of citation Y=article life K=citation rate (number of...