# All Questions

263 views

### Asymptotic normal distribution via the central limit theorem

I have a sample $n = 100$ with two "successes" (Two kids having a disease among 100). So we obviously have a binomial distribution. First I had to compute the maximum likelihood (ML) estimator ...
189 views

### Test to compare large and small datasets

I send Alice and Bob out to record people's eye colour (blue, brown, green, other). Alice does a great job and writes down the eye colour of 2000 people. Bob only records the eye colour of 20 people. ...
35 views

### discrete survival analysis reorganise data

I cannot figure out how I will reorganize and run my data for discrete survival analysis. I have 1169 farms repeated from 2001 to 2010 and I measure years in low income but poverty is not death. So ...
1k views

### Chi Squared Results in R and Python

Based on this answer, Python requires expected values in a chi square test to be absolute frequencies. Consider the following in Python: ...
5k views

### How to interpret negative ACF (autocorrelation function)?

So I plotted the ACF/PACF of oil returns and was expecting to see some positive autocorrelation but to my surprise I only get negative significant autocorrelation. How should I interpret the above ...
133 views

### Simple OLS with two samples

I want to obtain an unbiased estimator for $b_1$ in a simple regression like that: $Y_i = B_0 + B_1X_i + u_i$ when I have two samples, always same size for Y and X, but once the sample size is l and ...
130 views

### Reporting operative effect in paired t test

I just want to make sure I have something clear in my head. When I calculate the effect size for a paired samples t-test after obtaining a significant result, I simply take the mean of the differences ...
373 views

### Overlapping time series: is there any better way to visualize them?

I have this time series dataset: The graph shows trend lines for 7 stock prices. They are very close and overlapping, but you will be able to get an idea that trend lines are layered (i.e. brown ...
403 views

### Best subset selection

My statistical learning text claims that for best subset selection, 2^p total models must be fit through regression if for p covariates, we fit p choose k models at each k, k = 1,...,p. I interpret ...
120 views

308 views

### Maximum Likelihood for shifted Geometric Distribution

Really struggling with this please help. Find MLE for p and c $$\ {f}(x,p,c) = (1-p)^{x-c}p$$ x=c,c+1,c+2,..... p is between 0 and 1 c is element of the integers I am ...
2k views

### Chi Square Test for Independence in R and Python

Consider the following R code and output: ...
425 views

### What is the best way to analyze data if your experimental design changes while running the experiment?

I imagine this is a somewhat common situation in practice. I am thinking mainly in terms of preclinical drug trials. 1) During the course of the study a new technique is learned or some time/money is ...

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