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Merge pull request #97 from StatProofBook/master
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D/beta-data.md

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title: "Beta-distributed data"
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chapter: "Statistical Models"
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section: "Probability data"
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section: "Frequency data"
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topic: "Beta-distributed data"
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definition: "Definition"
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D/bin-data.md

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title: "Binomial observations"
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chapter: "Statistical Models"
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section: "Categorical data"
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section: "Count data"
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topic: "Binomial observations"
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definition: "Definition"
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D/dir-data.md

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title: "Dirichlet-distributed data"
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chapter: "Statistical Models"
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section: "Probability data"
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section: "Frequency data"
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topic: "Dirichlet-distributed data"
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definition: "Definition"
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D/mult-data.md

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title: "Multinomial observations"
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chapter: "Statistical Models"
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section: "Categorical data"
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section: "Count data"
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topic: "Multinomial observations"
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definition: "Definition"
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D/pgf.md

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**Definition:**
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1) If $X$ is a discrete [random variable](/D/rvar) taking values in the non-negative integers $\left\lbrace 0, 1, \ldots \right\rbrace$, then the probability-generating function of $X$ is defined as
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1) If $X$ is a [discrete](/D/rvar-disc) [random variable](/D/rvar) taking values in the non-negative integers $\left\lbrace 0, 1, \ldots \right\rbrace$, then the probability-generating function of $X$ is defined as
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$$ \label{eq:pgf-var}
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G_X(z) = \mathrm{E} \left[ z^X \right] = \sum_{x=0}^{\infty} p(x) \, z^x
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G_X(z) = \sum_{x=0}^{\infty} p(x) \, z^x
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$$
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where $z \in \mathbb{C}$ and $p(x)$ is the [probability mass function](/D/pmf) of $X$.
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2) If $X$ is a discrete [random vector](/D/rvec) taking values in the $n$-dimensional integer lattice $x \in \left\lbrace 0, 1, \ldots \right\rbrace^n$, then the probability-generating function of $X$ is defined as
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2) If $X$ is a [discrete](/D/rvar-disc) [random vector](/D/rvec) taking values in the $n$-dimensional integer lattice $x \in \left\lbrace 0, 1, \ldots \right\rbrace^n$, then the probability-generating function of $X$ is defined as
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$$ \label{eq:cgf-vec}
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G_X(z) = \mathrm{E} \left[ {z_1}^{X_1} \cdot \ldots \cdot {z_n}^{X_n} \right] = \sum_{x_1=0}^{\infty} \cdots \sum_{x_n=0}^{\infty} p(x_1,\ldots,x_n) \, {z_1}^{x_1} \cdot \ldots \cdot {z_n}^{x_n}
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G_X(z) = \sum_{x_1=0}^{\infty} \cdots \sum_{x_n=0}^{\infty} p(x_1,\ldots,x_n) \, {z_1}^{x_1} \cdot \ldots \cdot {z_n}^{x_n}
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$$
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where $z \in \mathbb{C}^n$ and $p(x)$ is the [probability mass function](/D/pmf) of $X$.

D/poiss-data.md

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title: "Poisson-distributed data"
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chapter: "Statistical Models"
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section: "Poisson data"
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section: "Count data"
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topic: "Poisson-distributed data"
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definition: "Definition"
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D/poissexp.md

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title: "Poisson distribution with exposure values"
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chapter: "Statistical Models"
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section: "Poisson data"
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section: "Count data"
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topic: "Poisson distribution with exposure values"
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definition: "Definition"
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I/PbA.md

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- [Covariance matrix of the multinomial distribution](/P/mult-cov)
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### JoramSoch (339 proofs)
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### JoramSoch (344 proofs)
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- [Accuracy and complexity for the univariate Gaussian](/P/ug-anc)
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- [Accuracy and complexity for the univariate Gaussian with known variance](/P/ugkv-anc)
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- [Probability of the empty set](/P/prob-emp)
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- [Probability under mutual exclusivity](/P/prob-exc)
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- [Probability under statistical independence](/P/prob-ind)
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- [Probability-generating function is expectation of function of random variable](/P/pgf-mean)
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- [Probability-generating function of the binomial distribution](/P/bin-pgf)
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- [Projection matrix and residual-forming matrix are idempotent](/P/mlr-idem)
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- [Projection of a data point to the regression line](/P/slr-proj)
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- [Quantile function is inverse of strictly monotonically increasing cumulative distribution function](/P/qf-cdf)
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- [Second central moment is variance](/P/momcent-2nd)
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- [Self-covariance equals variance](/P/cov-var)
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- [Simple linear regression is a special case of multiple linear regression](/P/slr-mlr)
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- [Square of expectation of product is less than or equal to product of expectation of squares](/P/mean-prodsqr)
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- [Sums of squares for simple linear regression](/P/slr-sss)
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- [Symmetry of the covariance](/P/cov-symm)
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- [Symmetry of the covariance matrix](/P/covmat-symm)
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- [Transposition of a matrix-normal random variable](/P/matn-trans)
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- [Two-sample t-test for independent observations](/P/ug-ttest2)
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- [Two-sample z-test for independent observations](/P/ugkv-ztest2)
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- [Value of the probability-generating function for argument one](/P/pgf-one)
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- [Value of the probability-generating function for argument zero](/P/pgf-zero)
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- [Variance of constant is zero](/P/var-const)
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- [Variance of parameter estimates for simple linear regression](/P/slr-olsvar)
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- [Variance of the Bernoulli distribution](/P/bern-var)

I/PbN.md

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| P356 | beta-chi2 | [Relationship between chi-squared distribution and beta distribution](/P/beta-chi2) | JoramSoch | 2022-10-07 |
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| P357 | betabin-mome | [Method of moments for beta-binomial data](/P/betabin-mome) | JoramSoch | 2022-10-07 |
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| P358 | bin-margcond | [Marginal distribution of a conditional binomial distribution](/P/bin-margcond) | JoramSoch | 2022-10-07 |
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| P359 | mean-prodsqr | [Square of expectation of product is less than or equal to product of expectation of squares](/P/mean-prodsqr) | JoramSoch | 2022-10-11 |
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| P360 | pgf-mean | [Probability-generating function is expectation of function of random variable](/P/pgf-mean) | JoramSoch | 2022-10-11 |
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| P361 | pgf-zero | [Value of the probability-generating function for argument zero](/P/pgf-zero) | JoramSoch | 2022-10-11 |
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| P362 | pgf-one | [Value of the probability-generating function for argument one](/P/pgf-one) | JoramSoch | 2022-10-11 |
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| P363 | bin-pgf | [Probability-generating function of the binomial distribution](/P/bin-pgf) | JoramSoch | 2022-10-11 |

I/PbT.md

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- [Probability of the empty set](/P/prob-emp)
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- [Probability under mutual exclusivity](/P/prob-exc)
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- [Probability under statistical independence](/P/prob-ind)
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- [Probability-generating function is expectation of function of random variable](/P/pgf-mean)
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- [Probability-generating function of the binomial distribution](/P/bin-pgf)
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- [Projection matrix and residual-forming matrix are idempotent](/P/mlr-idem)
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- [Projection of a data point to the regression line](/P/slr-proj)
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- [Proof Template](/P/-temp-)
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- [Second central moment is variance](/P/momcent-2nd)
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- [Self-covariance equals variance](/P/cov-var)
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- [Simple linear regression is a special case of multiple linear regression](/P/slr-mlr)
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- [Square of expectation of product is less than or equal to product of expectation of squares](/P/mean-prodsqr)
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- [Sums of squares for simple linear regression](/P/slr-sss)
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- [Symmetry of the covariance](/P/cov-symm)
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- [Symmetry of the covariance matrix](/P/covmat-symm)
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### V
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- [Value of the probability-generating function for argument one](/P/pgf-one)
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- [Value of the probability-generating function for argument zero](/P/pgf-zero)
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- [Variance of constant is zero](/P/var-const)
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- [Variance of parameter estimates for simple linear regression](/P/slr-olsvar)
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- [Variance of the Bernoulli distribution](/P/bern-var)

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