Graphs Flashcards
Y axis
Vertical axis
X axis
Horizontal axis
Y axis in frequency distribution graph
Frequency on y axis
Variables on x and y axis
Graph depicting relationship between variables
Tick labels
Tell values of tick marks on axis
Scatterplot
Variablity markers
Lines either side of data markers that measure a central tendency (spread of data around the mean). Either end will be a confidence interval. Add to graph : mean +/- 95% confidence interval
Connecting line between data markers
Line graph, usually data against time in x asis
Caption
Title on a graph. For tables above, for figures below.
X axis is a nominal variable
X axis is categoric. Image on the right. On the left X is continuous and not nominal
Errorplots
Use variability markers to measure central tendency around data markers when x axis is nominal
Boxplots
A type of error plot where Data marker is a median and box is a quartile range with variability markers on top below the box (range)
What is the explanatory variable?
Usually the x axis (nominal data). Explains the outcome of a study
What is the response variable?
Usually the y axis. Measures the outcome of a study
When to use Error plots
One variable is nominal, the other is continuous or scale
When to use box plots
When one variable is nominal and the other is scale or continuous
When to use scatter plots
Looking for relationship between two variables that are continuous or scale
When to use frequency distribution charts or pie charts
When inspecting frequencies for all other data or continuous scale data
Finding the interqurtile range
Q3 - Q1
1. Order the data from smallest to largest
2. Find the median, or middle value, of the data
3. Find the median of the lower and upper halves of the data
4. Subtract the lower quartile (Q1) from the upper quartile (Q3)
