Graphing in Theta

Flashcards relating to graphing in Theta.

Histogram

A graph of the frequency distribution for numerical data.

Frequency Distribution

Requires determining the range of data, selecting the number of classes, computing class intervals, determining boundaries (limits), and counting observations and assigning them to classes.

Classes/Bins

Groups of observations, usually between 5 and 15, but dependent on data size. Stata uses a default rule of square root of n to determine the number of classes.

Class Intervals

The width of the classes, computed after selecting the number of classes.

Boundaries/Limits

The determined values used for classes.

Frequency

The count of observations in each class.

Relative Frequency/Proportion

The frequency out of the total observations; should add up to one.

Percent

The relative frequency (proportion) multiplied by a hundred.

Frequency Histogram

A graph with values on the horizontal axis and frequency on the vertical axis; there are no gaps between the classes, so the bars touch each other.

Do File

A program written in Stata that can be executed as a whole or in sections.

Table Statement

A versatile command in Stata, used to create tables. Not working on the user's current Stata version.

Tab Stat

A Stata command used to tabulate variables and provide statistics like the sum for each of those observations.

Recode Command

Used in Stata to recode values in a variable based on specified conditions or ranges.

Graph Bar

A command in Stata used to generate a bar graph.

Histogram Command in Stata

A Stata command to directly request a histogram.

Line Charts

Used for ordered data, plotting successive values against index values, commonly used for time series data.

Time Series Data

Ordered data where the order of observations is important.

tsline Command

Command to get the line chart for order data, the time series variable must be specified.

tsset Command

Used to set the time series variable in Stata; necessary for using tsline.

Y Line

Adds horizontal lines on a time series graph at specified y-axis values.

Scale Command

Used to adjust the size of text on a graph.

Box Graph

A graph displaying summary statistics, showing the median, quartiles, and outliers.

Graphs for Categorical Data

Pie chart and bar graph.

Pie Chart

Excellent for showing relative differences with few categories.

Bar Graph

Better option for categorical data with many categories.

Tabulate Command

Used to calculate the frequency in different categories; suitable for categorical data.

P Label

Adds labels to each slice of the pie chart.

Pareto Diagram

Sorting data on expenditures, from highest to lowest expenditure category.

Y Title Command

Adds the name on the y axis.

Title Command

Puts a title on top of the graph.