In Linear Regression, we try to find a linear equation (y = bx + a) that best fits the given data. Where b = Σ((x-μx)*(y-μy))/Σ(x-μx) and a = μy - b*μx

Bar chart: Useful to see global trend where individual points have too much noise.

Difference between Bar Chart and Histograms: Bar Charts can show 2D whereas Histograms show only 1D, which is the frequency of data between ranges.

Pie chart: Good for relative data and comparing.

Statistics is deep and often manipulated, we need to be careful when translating raw data into decisions/conclusions.

If the probability of P(H) = 0.5, then P(H, H) would be: P(H) * P(H) = 0.25

For simple probability problems, a truth table helps finding the answer.

Probability of an event (P), an opposite event (1-P) and a composite event (P*P...*P) are independent.

Conditional Probability is where one event depends on another e.g. P(test | disease).

Bayes Rule: P(A|B) = P(B|A) * P(A) / P(B) Pior Probability (Cancer) * Test Evidence (Pos|Neg) = Posterior Probability

Bayes Rule describes the probability of an event, based on prior knowledge of conditions that might be related to the event e.g. if cancer is related to age, then, using Bayes Rule, a person’s age can be used to more accurately assess the probability that they have cancer.

In continuous distributions, every outcome has a probability of 0 e.g. spin a bottle in a 360 panel to hit an exact angle.

Data is correlated if knowledge about one variable tells you something about another variable.

Studies and news often confuse correlation and causation.

A correlation between variables does not automatically mean that the change in one variable is the cause of the change in the values of the other variable.

Causation indicates that one event is the result of the occurrence of the other event; i.e. there is a causal relationship between the two events.

Maximum Likelihood Estimator: 1/n * Sum(Appearances), e.g.: HHHT => 1/4 * Sum(H) => 1/4 * 3 = 0.75

When there isn't much data... fake it!

Mean: 1/n * Σ(x). Median: sort(x) and gets the value in the middle. Mode: Most frequent value. Useful for Bimodal or Multimodal (several bumps in a chart) data.

Variance measures how far the data is from the mean value, in other words, it show how spread the data is.

Variance can be calculated as the average of the squared difference for each element from the mean.: σ² = i/n * Σ(x-μ)²

You can think of variance as a measure of how wide the tree is from which the apples fell down.

Standard Deviation (SD) is also a measure of spread and it is the σ = sqrt(σ²). The scale of SD is the same as the mean.

The standard score is the signed number of standard deviations by which the value of an observation or data point is above the mean value of what is being observed or measured. Observed values above the mean have positive standard scores, while values below the mean have negative standard scores. z = (x - μ)/σ

Quartiles are the three points that divide the data set into four equal groups, each group comprising a quarter of the data. We could remove the lower and higher quartiles in order to get rid of outliers.

A percentile is a measure used in statistics indicating the value below which given percentage of observations in a group of observations fall. For example, the 20th percentile is the value (or score) below which 20% of the observations may be found.

The binomial distribution is used when there are exactly two mutually exclusive outcomes of a trial. The binomial distribution is used to obtain the probability of observing k successes in N trials, with the probability of success on a single trial denoted by P.

The Central Limit Theorem establishes that, in most situations, when independent random variables are added, their properly normalized sum tends toward a normal distribution (informally a "bell curve" or Gaussian) even if the original variables themselves are not normally distributed.

The Central Limit Theorem is a key concept in probability theory because it implies that probabilistic and statistical methods that work for normal distributions can be applicable to many problems involving other types of distributions.

The normal (or Gaussian) distribution is a very common continuous probability distribution. Normal distributions are important in statistics and are often used in the natural and social sciences to represent real-valued random variables whose distributions are not known.

If you're a doctor and you have 1 patient, use simple probability like a coin flip, if you have few patients use Binomial Distribution, if you have hundreds of thousand of patients (such as in testing a new drug) use Normal Distribution.

The more data we have and the more we trust the data the smaller the Confidence Interval will be.

Standard Deviation is not affected by the sample size whereas the Confidence Interval is.

Confidence Interval can be calculated by 1.96 * sqrt(σ²/N) 1.96 is a constant that depends on the sample size.

Hypothesis Test: Given a hypothesis H0 (or null hypothesis) (P = 0.8), we test if it is plausible or not. First, we define the Alternate Hypothesis H1 (P < 0.8), calculate the critical region, then we check if the sample result falls into the critical region.

Hypothesis Test: Checking the critical region -- one-side tail goes until 5% is reached, two-sided tail goes until 2.5% is reached on both ends. If yes, the we can reject H0 with a 95% confidence.

If the Null Hypothesis falls down into the Confidence Interval, we accept it, otherwise we reject it.

In order to calculate the Confidence Interval we need: 1) calculate the mean μ, 2) calculate the variance σ², 3) get the probability constant according to the number of samples, 4) calculate the CI: constant * sqrt(σ²/N).

Linear Regression: "b" is also known as Slope and "a" as Intercept. b = cov(x, y)/var(x) and a = μy - b*μx

Correlation coefficient is a value between -1 and 1 and it tells us how "related" 2 variables are. Both -1 and 1 stand for perfectly linear data.

Correlation formula is: r = Σ((x-μx)*(y-μy)) / sqrt(Σ(x-μx)² * Σ(y-μy)²)

If I were asked to name the chief benefit of the house, I should say: the house shelters day-dreaming, the house protects the dreamer, the house allows one to dream in peace.

It was like a miracle, but before our very eyes, and almost in the drawing of a breath, the whole body crumbled into dust and passed from our sight.

Look, if you're driving down the highway at 120 miles an hour, I'd rather be behind the wheel than in the backseat.

I wasn't trying to work out my own ancestry. I was trying to get people to feel slavery. I was trying to get across the kind of emotional and psychological stones that slavery threw at people.

The most precious gift we can offer others is our presence. When mindfulness embraces those we love, they will bloom like flowers.

Religion provides the only story that is fundamentally consoling in the face of the worst possible experiences - the death of a parent, for instance. In fact, many religions take away the problem entirely, because their adherents ostensibly believe that they're going to be reunited with everyone they love, and death is an illusion.

It is well, when judging a friend, to remember that he is judging you with the same godlike and superior impartiality.

Every father loves their children. I love my two sons very dearly. The only thing that is important to me is that they do what they want to do. They shouldn't feel a sense of obligation.