24 Is standardisation before Lasso really necessary? 10 Show that for a Geometric distribution, the probability generating function is given by $\frac{ps}{1-qs}$, $q=1-p$ 4 Find the distribution of (X, X+Y) when X and Y have a given joint Normal distribution 3 Comparing means with unequal variance and very different sample sizes 3 show that $X_{n}= E[X|\mathcal F_{n}]$ is an $\mathcal F_{n}$-martingale

### Reputation (1,055)

 +30 Is standardisation before Lasso really necessary? +10 Show that for a Geometric distribution, the probability generating function is given by $\frac{ps}{1-qs}$, $q=1-p$ +10 Splitting the dataset into Testing,Cross Validation and Training Set +10 Correlation or independence on contingency table for large N

### Questions (2)

 4 Multiple resampling test/train dataset when choosing new models? 2 Correlation or independence on contingency table for large N

### Tags (67)

 24 standardization 20 self-study × 4 24 lasso 10 geometric-distribution 24 regularization 10 probability 24 shrinkage 5 correlation × 6 24 normalization 5 covariance × 3