added definition "para"

Author: JoramSoch

D/para.md

@@ -0,0 +1,32 @@
+---
+layout: definition
+mathjax: true
+
+author: "Joram Soch"
+affiliation: "BCCN Berlin"
+e_mail: "joram.soch@bccn-berlin.de"
+date: 2024-09-27 12:40:05
+
+title: "Parameter"
+chapter: "General Theorems"
+section: "Probability theory"
+topic: "Probability distributions"
+definition: "Statistical parameter"
+
+sources:
+  - authors: "Wikipedia"
+    year: 2024
+    title: "Statistical parameter"
+    in: "Wikipedia, the free encyclopedia"
+    pages: "retrieved on 2024-09-27"
+    url: "https://en.wikipedia.org/wiki/Statistical_parameter#Parameterised_distributions"
+
+def_id: "D204"
+shortcut: "para"
+username: "JoramSoch"
+---
+
+
+**Definition:** A parameter, also "statistical parameter", is any fixed quantity, i.e. [constant](/D/const) scalar, vector or matrix, that describes a parametrized [probability distribution](/D/dist).
+
+Examples of parameters include the mean and variance parameters of a [normal distribution](/D/norm), covariance parameters in a [multivariate](/D/mvn) or [matrix](/D/matn)-normal distribution, shape and rate parameters of the [gamma distribution](/D/gam) or the vector of category probabilities in a [multinomial distribution](/D/mult).