# What’s New in DataGraph 5.1

DataGraph version 5.1 is full of additions and improvements that started with user requests. We think this version has a little something for everyone.

## New Link to Files

Link to URL/File, online or locally. Works for comma-separated text (CSV), or JSON formatted data. Set a timed reload for data that is frequently updated or being collected over short time intervals.

You can use this new functionality to link to data saved online such as in GitHub repositories. For example, here is a file that links to the Palmer Penguin data set.

## New Functions

By popular demand, we added two new functions, sd() and sum(), to make it easier to calculate these parameters across columns. For example, to sum across rows from three columns A,B, and C, enter sum(A,B,C).

We had a request to add a special function, Lambert W., or lambertw(). This function is useful for solving a wide variety of problems, including Michaelis–Menten kinetics (Wikipedia: Lambert_W_function).

To learn about these and other functions see our updated Function reference.

## Format a Graph Group

Now you can apply Style and Canvas Settings to a subset of graphs in a Graph Group. In the past, you could apply settings to all the graphs in a file using the gear menu from the settings themselves. Now, you can select the graph that has the formatting you want to apply.

Click the gear menu on the Graph Group to select the settings to apply.

## Non-linear curve fitting

In the Fit command, the Arbitrary fit (non-linear curve fitting) now has the option of adding bounds on parameter coefficients. By default, the range is set to (-∞, ∞). You can constrain the maximum value, the minimum value, or both.

In the following example, the lower value for b is set to zero, limiting the coefficient to positive values, and providing a good fit of the data.

## Confidence Intervals

For the first time, DataGraph now has a way to draw confidence intervals around a mean value. This option has been added to the Box Command. The new “Point + Interval” drawing type can display the mean or median along with different intervals, such as the min/max, percentiles, or confidence intervals around a mean.

With this functionality, you can group data and display the mean with a confidence interval.

You can also show the middle percentage around the median value. Here the median point is combined with showing all the points in the distribution.

## Release Notes

Click here to view the full release notes.

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