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possible to create Custom Series on charts, which include fixed values, percentile, other statistical functions and expressions.
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The data used on this page is available from the PhixFlow Learning Centre. |
- custom series
- name
- axis
- line colour
- line style
- line smoothing
- mode
- Percentile - A number entry 0-100
- Trend - Drop down selection of algorithm
- Expression - a jep expression
When a single series exists on the selected axis the data points can be used as the data array. When multiple series are present then the array is the sum of the data points at each x point/category on that axis will be calculated
Percentile: The specified percentile function will be calculated over the data array. This will produce a single horizontal line that should be plotted the full width of the graph area.
Trend: The specified trend algorithm will be calculated over the data array, this will return a new data array with the point of the trend lines. An appropriate library should be found with a selection of trend algorithms
Expression: The expression will have access to the the data array. This will allow simple expressions such as 10, or more complex onescustom series to any PhixFlow chart such as quartile, trend, target and/or arbitrary lines.
There are 4 types (modes) of custom series:
- Algorithm
- Percentile
- Trend Line
- Expression
For the Properties, see Custom Series.
Algorithm Lines
Algorithm lines involve applying mathematical formulas or algorithms to chart data. The lines can help identify trends, make predictions or highlight patterns in the data. The chosen algorithm will be calculated using values from each column of data.
Below is a line chart showing how the quantity of different objects changes year-on year from 2001 to 2014. The teal line represents the mean value for each horizontal axis attribute (year). The yellow line represents the cumulative percent. Click on the image to enlarge it.
Creating Algorithm Lines
- Create a line or bar chart, see Creating a Line Chart or Creating a Bar Chart
- Right-click the chart and click
Insert excerpt _view_show_config _view_show_config nopanel true - In the
, expand the Custom Series sectionInsert excerpt _property_settings _property_settings nopanel true - Click the
icon to create a new Custom SeriesInsert excerpt _add_icon _add_icon nopanel true - Name: Enter a name
- Right Axis: Enable this to display the custom series for the data on the right axis
- Mode: Choose
Algorithm - Algorithm: Choose from:
- Cumulative Sum - shows the running total of the data values
Cumulative Percent - shows the total percentage accumulated at each point in the data series
Tip Cumulative Percent reflects the cumulative contribution or impact of each percentage value as it progresses over time or through a particular set of data.
Mean - shows the average value
- Minimum - shows the smallest value
- Median - shows the middle value, when the data is ordered ascending
- Maximum - shows the largest value
Standard Deviation - shows how spread out the values are from the mean
Tip Standard Deviation helps to understand the dispersion or variability of the data points. A larger standard variation indicates that the values are more spread out from the mean.
- Sum - shows the result of adding all values together
- For a multi-series chart, this will be the sum for each column of data, for example:
- For a single-series chart, this will be the sum of all values, for example:
- For a multi-series chart, this will be the sum for each column of data, for example:
- Colour: Choose a colour for the chart line from the colour picker
- Style: Select a line style from dashed, dotted or solid
Percentile Lines
Percentile lines are a type of quantile showing how a value compares to other values within the same set of data. They indicate the value below which a given percentage of values in a set of data falls, e.g. the 50th percentile is represented below the point at which 50% of the data falls.
Below is a line chart showing how the quantity of different objects change for each quarter of the year 2015 to 2016. The dashed yellow line represents the 30th percentile, while the dashed purple line represents the 60th percentile. Click on the image to enlarge it.
Creating Percentile Lines
- Create a line or bar chart, see Creating a Line Chart or Creating a Bar Chart
- Right-click the chart and click
Insert excerpt _view_show_config _view_show_config nopanel true - In the
, expand the Custom Series sectionInsert excerpt _property_settings _property_settings nopanel true - Click the
icon to create a new Custom SeriesInsert excerpt _add_icon _add_icon nopanel true - Name: Enter a name
- Right Axis: Enable this to display the custom series for the data on the right axis
- Mode: Choose
Percentile - Percentile: Enter a number between 1 and 100
- Colour: Choose a colour for the chart line from the colour picker
- Style: Select a line style from dashed, dotted or solid
Trend Lines
Trend lines represent the general direction in which data points are moving or trending over time. They help visualise patterns in data and can help make predictions about whether data will be increase or decrease over time. The trend lines available in PhixFlow are: Linear, Quadratic, Cubic and Gaussian.
Below is a bar chart showing how the quantity of different objects change month-on-month. The dashed pink line represents a Gaussian trend. Click on the image to enlarge it.
Creating Trend Lines
- Create a line or bar chart, see Creating a Line Chart or Creating a Bar Chart
- Right-click the chart and click
Insert excerpt _view_show_config _view_show_config nopanel true - In the
, expand the Custom Series sectionInsert excerpt _property_settings _property_settings nopanel true - Click the
icon to create a new Custom SeriesInsert excerpt _add_icon _add_icon nopanel true - Name: Enter a name
- Right Axis: Enable this to display the custom series for the data on the right axis
- Mode: Choose
Trend Line - Trend Line: Choose from:
Linear - represent the relationship between variables as a straight line.
This is useful where data increases or decreases along a straight line, at a constant rate.
Quadratic - represent the relationship between variables as one curve in a line.
This is useful where data fluctuates up then down, or vice versa.
Cubic - represent the relationship between variables as two curves in a line.
This is useful where data fluctuates up and down.
Gaussian - represent the relationship between variables as a bell-shaped distribution.
This trend line is also known as normal distribution and is characterised by its symmetric shape around the mean.
This is useful for showing a symmetrical plot of data around its mean value, where the width of the curve is defined by the standard deviation.
- Colour: Choose a colour for the chart line from the colour picker
- Style: Select a line style from dashed, dotted or solid
Expression
Create bespoke chart lines using the Expression editor, which has access to the data in each recordset as a data array. Expressions can be used for simple expressions, e.g. 10, or more complex expressions, such as rescaling and rolling averages. The expression should return either:
- a single value (fixed horizontal line)
Jep functions should be added to expose the percentile and trend algorithms.
Creating Quartile Lines
(Upper/Lower control lines)
There are 3 types of line charts
- Line Chart (category)
- Line Chart (numeric)
- Line Chart (time)
To change the type of line chart
- Right click on a chart and Show the view configuration
- Open the Basics section
- Select Line Chart (category), Line Chart (numeric) or Line Chart (time) under Display Type
Creating Trends Lines
A teacher wants to display the number of students per intake year as a line chart. To add a line chart:
Below is a line chart showing how the value of different objects changes year-on-year. The expression, represented by the dotted blue line, converts negative values for the attribute, Object B, to 0 and doubles the positive values. Click on the image to enlarge it.
Creating Expression Lines
- Create a line or bar chart, see Creating a Line Chart or Creating a Bar Chart
- Right-click the chart and click
Insert excerpt _view_show_config _view_show_config nopanel true - In the
Insert excerpt _
Drag and drop the desired table onto the screen. In this instance, the School_Students table is dragged onto the screen.
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This table can be downloaded from the PhixFlow learning centre |
Creating Target (Arbitrary) Lines
Line Charts can display multiple series on the same graph. For example, the teacher might want to show the proportion of students of each gender on their line chart. To do this
