Statistics How To

An ellipsoid is a three-dimensional shape that has an ellipse or circle for every cross section. A sphere is a special case, but every ellipsoid is symmetric about three mutually perpendicular axes which meet in its center. Equations and Types of Ellipsoid Let a, b, and c be positive real numbers which represent the length … Read more

Non-Euclidean geometry is any type of geometry that is different from the “flat” (Euclidean) geometry you learned in school. It’s a set of geometries where the rules and axioms you are used to get broken: parallel lines are no longer parallel, circles don’t exist, and triangles are made from curved lines. Why Do We Need … Read more

Euclidean geometry is the familiar geometry you’re taught in school: angles in a triangle always add up to 180°; a line has length but no width; a quadrilateral has four sides. It includes the Pythagorean theorem, the acronym SOHCAHTOA and ways to calculate the circumference and area of a circle. The word geometry comes from … Read more

Non-Euclidean Geometry > What is Taxicab Geometry? Taxicab geometry is named after the familiar taxicab, navigating the streets of a typical 19th century city. Many cities built their road system around a grid, where streets run north to south or east to west. In order to get from point A to point B, a taxicab … Read more

Types of Variable > Quantitative Variables Contents: Definition of a quantitative variable What is the quantitative data condition? 1. Definition   Two types of variables are used in statistics: Quantitative (also called measurement variable or numerical variables) and categorical (also called qualitative): Quantitative variables or numeric variables are numbers such as counts or percents. Categorical … Read more

Probability and Statistics Index > SPSS Statistics > Crosstabs in SPSS Crosstabs is just another name for contingency tables, which summarize the relationship between different categorical variables. Crosstabs in SPSS can help you visualize the proportion of cases in subgroups. The basic crosstabs in SPSS command gives you counts by default (in other words, you’ll … Read more

Probability and Statistics Index > SPSS Statistics > How to Make an SPSS Frequency Table SPSS is a popular statistical software package commonly used for the social sciences. A frequency distribution table can give you an idea about the spread of your data in a glance. Frequencies form the foundation of further study in statistics, … Read more

Statistics Definitions > Contingency Table Contingency Table: Overview Contingency tables (also called crosstabs or two-way tables) summarize the relationship between several categorical variables. It is a special type of frequency distribution table, where two variables are shown simultaneously. For example, a researcher might be investigating the relationship between AIDS and sexual preference. The two variables … Read more

Probability and Statistics > Basic Statistics > What is a Census in Statistics? Census in Statistics: Overview The dictionary definition of a census is “an official count or survey of a population, typically recording various details of individuals.” However, it’s meaning in statistics is slightly different: a census is a survey that studies every member … Read more

Probability and Statistics> TI 83 for Statistics TI 83 for Statistics: Overview. The TI 83 graphing calculator is a popular hand held calculator that’s most often recommended for stats students. The calculator has an array of functions that can help you with your elementary stats or AP stats course. For example, the calculator has a … Read more