![]() (To be precise, it's the line that minimizes the sum of squared distances from every point to it.)Ī polynomial trend line displays data directionality as a curved line. Looker Studio supports several types of trend lines, which are available in the Trendline drop-down menu:Ī linear trend line is the straight line that most closely approximates the data in the chart. Bubble chartĪ trend line is a line that is superimposed on a chart to reveal the overall direction of the data. In addition to the basic scatter chart, you can also add a preset bubble chart from the toolbar. (You might want to investigate your own chart outliers to see if you can discover why they don't fit the norm.) The right hand chart also shows the presence of 2 outliers: the course in the bottom left had few hours of homework but also had a low average grade, while the course at the top of the graph had the highest amount of homework, yet still had close to a 3.0 grade average. The trend line in this chart slopes downwards from left to right, indicating there is a negative correlation between the metrics: the less homework assigned, the better the average grade. The chart on the right compares the average student grade with the number of hours of homework for each course. ![]() I.e., the more engaged the student, the more likely they are to complete the course. The left-hand chart compares the average course completion rate with the average activity rate (a measurement of how engaged the students were, in terms of forum posts, class activities completed, etc.) The linear trend line in this chart slopes upwards from left to right, indicating that there is a positive relationship between activity rate and completion rate. The scatter charts below give you 2 different views of the performance for a fictional online university. Data points nearer the trend line are more closely correlated than those farther away from the line. Lack of slope can mean there is little or no correlation between the variables. A slope downwards from upper left to lower right can mean a negative correlation: the more X, the less Y. In other words, the more X, then the more Y. The general direction of slope of the trend line shows the type of relationship ("correlation") between the variables: a slope upwards from left to right indicates a positive correlation. To find trends and patterns, and to identify outliers in your data, you can include a trend line. This could help you answer questions such as "Do more expensive ads result in better conversions in all locales?" For example, you could use a scatter chart to see if there's a correlation between ad spend and conversion rate for each country, broken down by region and ad campaign. You can group the data by adding up to 3 dimensions to the chart. If you want to create a scatter plot comparing groups by more than one variable, enter data on a Grouped data table with side by side replicates.To configure a scatter chart in Looker Studio, you select metrics for the horizontal (X) and vertical (Y) axes of the chart. If you instead want a graph that shows only the mean and error for each data set, double click on any data point to open the Format Graph dialog and choose "One symbol per column" and the type of error you want to show. Prism will create error bars from all the data points in each column. To make the graph above, start with a Column table and enter all the data points for each data set in a column. All the data values for each group should be entered in a single column. If you want to compare groups and show every data point along with lines for mean and error for each group, start with a column table. To show mean and error instead, choose Mean and Error from this drop-down menu instead. To format an XY graph to show each data point as in the graph above, click on the Format Graph button on the toolbar, select Global to choose all data sets, and choose to Show each Replicate. Here is the data table for the graph above. Start with an XY table if you want to show all your replicates for each X value. When you make your graph, you can choose to show all the replicates on your graph instead of error bars. ![]() With an XY data table, each X value can have several replicates for every data set. Three of these can be used to create scatter graphs. ![]() Prism offers seven distinct types of data tables.
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