Screening Results

These results use only the attempts saved in this browser. Skills you have not tested remain unmeasured.

Secure means every assigned question is solved and at least one directly tests the skill. Missing means every assigned question was attempted with no clear approach. Shaky covers partial, mixed, incomplete, or indirect evidence.

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Mathematics

Linear Algebra

Practice

matrix operations1 question

Unmeasured0 of 1

linear systems1 question

Unmeasured0 of 1

row reduction1 question

Unmeasured0 of 1

rank1 question

Unmeasured0 of 1

subspaces1 question

Unmeasured0 of 1

rank nullity1 question

Unmeasured0 of 1

linear independence1 question

Unmeasured0 of 1

basis dimension1 question

Unmeasured0 of 1

inverse1 question

Unmeasured0 of 1

determinant1 question

Unmeasured0 of 1

trace1 question

Unmeasured0 of 1

change of basis1 question

Unmeasured0 of 1

orthogonality1 question

Unmeasured0 of 1

projection1 question

Unmeasured0 of 1

least squares1 question

Unmeasured0 of 1

qr1 question

Unmeasured0 of 1

eigenvalues1 question

Unmeasured0 of 1

eigenvectors1 question

Unmeasured0 of 1

diagonalization1 question

Unmeasured0 of 1

symmetric matrices1 question

Unmeasured0 of 1

quadratic forms1 question

Unmeasured0 of 1

positive definite semidefinite1 question

Unmeasured0 of 1

svd1 question

Unmeasured0 of 1

low rank approximation1 question

Unmeasured0 of 1

pca via svd1 question

Unmeasured0 of 1

matrix norms1 question

Unmeasured0 of 1

Calculus

Practice

limits1 question

Unmeasured0 of 1

continuity1 question

Unmeasured0 of 1

single variable differentiation1 question

Unmeasured0 of 1

single variable integration1 question

Unmeasured0 of 1

partial derivatives1 question

Unmeasured0 of 1

gradient1 question

Unmeasured0 of 1

directional derivative1 question

Unmeasured0 of 1

jacobian1 question

Unmeasured0 of 1

multivariable chain rule1 question

Unmeasured0 of 1

taylor approximation1 question

Unmeasured0 of 1

hessian1 question

Unmeasured0 of 1

calculus stationary points1 question

Unmeasured0 of 1

unconstrained optimization1 question

Unmeasured0 of 1

calculus convexity1 question

Unmeasured0 of 1

constrained optimization1 question

Unmeasured0 of 1

implicit differentiation1 question

Unmeasured0 of 1

matrix calculus1 question

Unmeasured0 of 1

Probability

Practice

counting1 question

Unmeasured0 of 1

event algebra1 question

Unmeasured0 of 1

inclusion exclusion1 question

Unmeasured0 of 1

conditional probability1 question

Unmeasured0 of 1

total probability1 question

Unmeasured0 of 1

bayes rule1 question

Unmeasured0 of 1

probabilistic independence1 question

Unmeasured0 of 1

discrete random variables1 question

Unmeasured0 of 1

pmf1 question

Unmeasured0 of 1

cdf1 question

Unmeasured0 of 1

continuous random variables1 question

Unmeasured0 of 1

pdf1 question

Unmeasured0 of 1

named distributions2 questions

Unmeasured0 of 2

transformations2 questions

Unmeasured0 of 2

joint distributions1 question

Unmeasured0 of 1

marginal distributions1 question

Unmeasured0 of 1

conditional distributions1 question

Unmeasured0 of 1

expectation1 question

Unmeasured0 of 1

variance1 question

Unmeasured0 of 1

covariance2 questions

Unmeasured0 of 2

correlation1 question

Unmeasured0 of 1

conditional expectation1 question

Unmeasured0 of 1

law total expectation1 question

Unmeasured0 of 1

law total variance1 question

Unmeasured0 of 1

sums of random variables1 question

Unmeasured0 of 1

law of large numbers1 question

Unmeasured0 of 1

central limit theorem1 question

Unmeasured0 of 1

multivariate gaussian1 question

Unmeasured0 of 1

Statistics

Practice

samples1 question

Unmeasured0 of 1

sample statistics1 question

Unmeasured0 of 1

sampling distributions1 question

Unmeasured0 of 1

estimator bias1 question

Unmeasured0 of 1

estimator variance1 question

Unmeasured0 of 1

mean squared error1 question

Unmeasured0 of 1

consistency1 question

Unmeasured0 of 1

standard error1 question

Unmeasured0 of 1

likelihood1 question

Unmeasured0 of 1

maximum likelihood1 question

Unmeasured0 of 1

map1 question

Unmeasured0 of 1

method of moments1 question

Unmeasured0 of 1

bayesian updating1 question

Unmeasured0 of 1

confidence intervals1 question

Unmeasured0 of 1

null alternative1 question

Unmeasured0 of 1

type i error1 question

Unmeasured0 of 1

type ii error1 question

Unmeasured0 of 1

statistical power1 question

Unmeasured0 of 1

p values1 question

Unmeasured0 of 1

critical regions1 question

Unmeasured0 of 1

goodness of fit1 question

Unmeasured0 of 1

chi square1 question

Unmeasured0 of 1

simple linear regression1 question

Unmeasured0 of 1

Programming

Python

Practice

python syntax2 questions

Unmeasured0 of 2

functions2 questions

Unmeasured0 of 2

python sequence semantics2 questions

Unmeasured0 of 2

mutability3 questions

Unmeasured0 of 3

aliasing3 questions

Unmeasured0 of 3

shallow copy1 question

Unmeasured0 of 1

complexity1 question

Unmeasured0 of 1

classes1 question

Unmeasured0 of 1

value equality2 questions

Unmeasured0 of 2

Control Flow

Practice

conditionals3 questions

Unmeasured0 of 3

loops3 questions

Unmeasured0 of 3

strings3 questions

Unmeasured0 of 3

Data Structures

Practice

sequence data structures3 questions

Unmeasured0 of 3

dictionaries3 questions

Unmeasured0 of 3

sets2 questions

Unmeasured0 of 2

stack3 questions

Unmeasured0 of 3

queue2 questions

Unmeasured0 of 2

heap2 questions

Unmeasured0 of 2

hash map2 questions

Unmeasured0 of 2

binary search1 question

Unmeasured0 of 1

dfs1 question

Unmeasured0 of 1

bfs1 question

Unmeasured0 of 1

Recursion

Practice

base case3 questions

Unmeasured0 of 3

recursive trace1 question

Unmeasured0 of 1

recursive implementation2 questions

Unmeasured0 of 2

Machine Learning

Regression

Practice

linear regression3 questions

Unmeasured0 of 3

squared loss2 questions

Unmeasured0 of 2

normal equations2 questions

Unmeasured0 of 2

regression gradient1 question

Unmeasured0 of 1

regression regularization1 question

Unmeasured0 of 1

Classification

Practice

logistic regression1 question

Unmeasured0 of 1

cross entropy2 questions

Unmeasured0 of 2

decision boundary1 question

Unmeasured0 of 1

classification thresholds2 questions

Unmeasured0 of 2

confusion matrix1 question

Unmeasured0 of 1

accuracy1 question

Unmeasured0 of 1

precision recall1 question

Unmeasured0 of 1

Gradient Descent

Practice

gradient update3 questions

Unmeasured0 of 3

learning rate2 questions

Unmeasured0 of 2

convergence1 question

Unmeasured0 of 1

sgd1 question

Unmeasured0 of 1

Optimization

Practice

objective functions3 questions

Unmeasured0 of 3

optimization stationary points2 questions

Unmeasured0 of 2

optimization convexity2 questions

Unmeasured0 of 2

optimization regularization2 questions

Unmeasured0 of 2

optimization diagnostics1 question

Unmeasured0 of 1

Neural Networks

Practice

forward pass2 questions

Unmeasured0 of 2

activations2 questions

Unmeasured0 of 2

neural network chain rule2 questions

Unmeasured0 of 2

backpropagation2 questions

Unmeasured0 of 2

neural network losses2 questions

Unmeasured0 of 2

dense network parameter count1 question

Unmeasured0 of 1

Convolution

Practice

convolution operation1 question

Unmeasured0 of 1

output shape2 questions

Unmeasured0 of 2

padding1 question

Unmeasured0 of 1

stride1 question

Unmeasured0 of 1

convolution parameter count1 question

Unmeasured0 of 1

pooling2 questions

Unmeasured0 of 2

receptive field1 question

Unmeasured0 of 1

Dimensionality Reduction

Practice

pca objective1 question

Unmeasured0 of 1

centering1 question

Unmeasured0 of 1

covariance eigendecomposition3 questions

Unmeasured0 of 3

pca via svd1 question

Unmeasured0 of 1

explained variance3 questions

Unmeasured0 of 3

Unsupervised Learning

Practice

k means2 questions

Unmeasured0 of 2

clustering objective2 questions

Unmeasured0 of 2

gaussian mixtures1 question

Unmeasured0 of 1

expectation maximization1 question

Unmeasured0 of 1

Theory

Practice

bias variance2 questions

Unmeasured0 of 2

generalization3 questions

Unmeasured0 of 3

overfitting1 question

Unmeasured0 of 1

train validation test2 questions

Unmeasured0 of 2

model complexity1 question

Unmeasured0 of 1