Data

As a text editor (Edit)

By clicking on the Edit link in the data list, the content of the data file will be shown in a textarea for editing as shown in the figure below. The edit can be saved by clicking the button Save or Save and go back to data list.

In spread sheet (Edit)

If a data file has less than 200 rows of data, it can be edited in the spreadsheet mode as shown in the figure below. This mode allows the edit of individual elements.

From existing data file (Edit)

To convert a data file, click the link Convert. Then the screen below is shown. On the screen, a user can type in required data information for jags. Each row represents a piece of information. Any R data manipulation code can be used here. After input, one can click on Convert data. The jags format data are given in a textarea that can be further edited. Note that the default data set name is data can be used in the R code. For example, n = nrow(data) gets the sample size. Note that for matrices, one need to first convert the data.frame to matrix such as as.matrix(data, 1:2).

Input data directly (Edit)

To input and convert data, one can use the app in the link: http://webjags.psychstat.org/modules/data/tobugs.php . Then a screen with a text area below is shown. In the text area, one can simply type the data.

• Each piece of information, such as a scalar, a vector, or a matrix, is separated by a semi-colon ;.
• For each information, its name is first given and then followed by =.
• A scalar, vector, or matrix can be used.
• For a vector, a list of values need to be provided. One can change to a new line if needed.
• For a matrix or an array, the dimension of the matrix is first given and then the data information is provided. The dimension and data are separated by comma ,.
• After the input, one can click on the button Convert data. Then converted data will be shown as in the captured screen below.
• Multiple sets of data can be converted by separating them with vertical bar |.

Convert data in place (Edit)

jags data can also be converted when needed. In doing so, one can use the same method above but directly put data in place of data or initial values. For example, the screen below gives an example of inputing two sets of initial values in order to initializing two chains. Note that data for each chain are separated by vertical bar |. After input, one can click on the button Convert data. Then converted data will be shown as in the captured screen below.

• Data input

• Converted data