background preloader

Free Statistics - Free Statistical Software

Statistik „ist die Lehre von Methoden zum Umgang mit quantitativen Informationen“ ( Daten ). Sie ist eine Möglichkeit, „eine systematische Verbindung zwischen Erfahrung ( Empirie ) und Theorie herzustellen“. [1] Sie ist damit unter anderem die Zusammenfassung bestimmter Methoden, um empirische Daten zu analysieren . Statistik wird einerseits als eigenständige mathematische Disziplin über das Sammeln, die Analyse, die Interpretation oder Präsentation von Daten betrachtet, andererseits als Teilgebiet der Mathematik , insbesondere der Stochastik , angesehen. [2] [3] [4] Die Statistik wird in die folgenden drei Teilbereiche eingeteilt: Die (auch oder ): Vorliegende Daten werden in geeigneter Weise beschrieben, aufbereitet und zusammengefasst. Die (auch , oder ): In der induktiven Statistik leitet man aus den Daten einer Stichprobe Eigenschaften einer Grundgesamtheit ab. Der Unterschied zwischen und Statistik wird auch an den Fragestellungen deutlich: [5] Amtliche Statistik [ Bearbeiten ]

VBA Tips: Build an Excel Add-In About Add-Ins An Excel Add-In is a file (usually with an .xla or .xll extension) that Excel can load when it starts up. The file contains code (VBA in the case of an .xla Add-In) that adds additional functionality to Excel, usually in the form of new functions. Add-Ins provide an excellent way of increasing the power of Excel and they are the ideal vehicle for distributing your custom functions. Excel is shipped with a variety of Add-Ins ready for you to load and start using, and many third-party Add-Ins are available. This article shows you how to write a custom function using Excel VBA and how to save and install it as an Add-In. In the Excel tutorial Working Out a Person's Age - An Introduction to Nested IF Statements I showed how to use IF statements to calculate someone's age from their date of birth. If you are already comfortable with writing custom functions, you can go straight to the section explaining how to save your UDFs as an Add-In. Write the Function Step 2: Enter the Code

The Order of Operations: PEMDAS Purplemath If you are asked to simplify something like "4 + 2×3", the question that naturally arises is "Which way do I do this? Because there are two options!" I could add first: ...or I could multiply first: Which answer is the right one? MathHelp.com It seems as though the answer depends on which way you look at the problem. To eliminate this confusion, we have some rules of precedence, established at least as far back as the 1500s, called the "order of operations". A common technique for remembering the order of operations is the abbreviation (or, more properly, the "acronym") "PEMDAS", which is turned into the mnemonic phrase "Please Excuse My Dear Aunt Sally". Parentheses (simplify inside 'em) Exponents Multiplication and Division (from left to right) Addition and Subtraction (from left to right) When you have a bunch of operations of the same rank, you just operate from left to right. Content Continues Below Simplify 4 + 32. Simplify 4 + (2 + 1)2. Simplify 4 + [–1(–2 – 1)]2.

Portal:Statistik aus Wikipedia, der freien Enzyklopädie Willkommen im Portal Statistik Die Statistik befasst sich mit der Gewinnung und Auswertung quantitativer Informationen. Statistische Methoden erklären Gesetzmäßigkeiten bei bestimmten Masseerscheinungen, die aber für Einzelereignisse sonst nicht definiert werden können. Induktive Statistik Empirische Forschungsmethoden

History of Normal Distribution History of the Normal Distribution Author(s) David M. Lane Prerequisites Distributions, Central Tendency, Variability, Binomial Distribution In the chapter on probability, we saw that the binomial distribution could be used to solve problems such as "If a fair coin is flipped 100 times, what is the probability of getting 60 or more heads?" where x is the number of heads (60), N is the number of flips (100), and π is the probability of a head (0.5). Abraham de Moivre, an 18th century statistician and consultant to gamblers, was often called upon to make these lengthy computations. de Moivre noted that when the number of events (coin flips) increased, the shape of the binomial distribution approached a very smooth curve. Figure 1. de Moivre reasoned that if he could find a mathematical expression for this curve, he would be able to solve problems such as finding the probability of 60 or more heads out of 100 coin flips much more easily. Figure 2.

Free Statistics Programs and Materials by Bill Miller The T-Test The t-test assesses whether the means of two groups are statistically different from each other. This analysis is appropriate whenever you want to compare the means of two groups, and especially appropriate as the analysis for the posttest-only two-group randomized experimental design. Figure 1 shows the distributions for the treated (blue) and control (green) groups in a study. Actually, the figure shows the idealized distribution – the actual distribution would usually be depicted with a histogram or bar graph. The figure indicates where the control and treatment group means are located. What does it mean to say that the averages for two groups are statistically different? This leads us to a very important conclusion: when we are looking at the differences between scores for two groups, we have to judge the difference between their means relative to the spread or variability of their scores. The formula for the t-test is a ratio. SE(XˉT​−XˉC​)=nT​varT​​+nC​varC​​​

Wahrscheinlichkeitstheorie Die oder ist ein Teilgebiet der Mathematik , das aus der Formalisierung der Modellierung und der Untersuchung von Zufallsgeschehen hervorgegangen ist. Gemeinsam mit der mathematischen Statistik , die anhand von Beobachtungen zufälliger Vorgänge Aussagen über das zugrunde liegende Modell trifft, bildet sie das mathematische Teilgebiet der Stochastik . Die zentralen Objekte der Wahrscheinlichkeitstheorie sind zufällige Ereignisse , Zufallsvariablen und stochastische Prozesse . Axiomatischer Aufbau [ Bearbeiten ] Wie jedes Teilgebiet der modernen Mathematik wird auch die Wahrscheinlichkeitstheorie mengentheoretisch formuliert und auf axiomatischen Vorgaben aufgebaut. Diese Definitionen geben keinen Hinweis darauf, wie man die Wahrscheinlichkeiten einzelner Ereignisse ermitteln kann; sie sagen auch nichts darüber aus, was Zufall und was Wahrscheinlichkeit eigentlich sind. Axiome von Kolmogorow [ Bearbeiten ] Das sichere Ereignis hat die Wahrscheinlichkeit 1: . . Dann ist die Ergebnismenge .

Related: