Stats Tab

Compute basic measurements of your data waves, such as Max, Min, Avg, Slope or Level crossing.

Use the wave increment controls on NeuroMatic’s control panel to step through your data. Results are displayed in the currently selected channel graph.

Use the channel and wave select controls to select the channel and set of waves you wish to analyze. Select the All Waves button. Results are saved to Stats1 waves which are automatically displayed in a table.

Use Stats2 controls to analyze your Stats1 waves.

Stats1

Select the type of measurement you wish to compute from the left drop-down menu. Results are displayed at right (y, t, m, b).

Max, maximum point (y, t)

Min, minimum point (y, t)

Avg, average (y)

SDev, standard deviation (y)

Var, variance (y)

RMS, root mean square (y)

Area (y)

Slope (m, b)

Level, first level crossing (t)

Level+, first level crossing on positive slope (t)

Level-, first level crossing on negative slope (t)

Off, turn off Stats window computation.

t_bgn, t_end: use these parameters to set the measurement time window, or use your mouse to drag the vertical Stats Drag Waves displayed in the currently selected channel graph.

Bsln: click this checkbox to compute a baseline value (b), with the option to automatically subtract the baseline value from the y-data measurement.

Rise Time: click this checkbox to compute the rise time (rt) from baseline to a Max or Min point. The default setting is 10-90% rise time.

Decay Time: click this checkbox to compute the decay time (dt) from a Max or Min point to the baseline. The default setting is a 37% decay time, or one-exponential time constant.

Smooth: compute measurements on smoothed waves by entering the number of points to smooth (n > 1). Turn smoothing off by entering “0”. Enter the smoothing function (binomial or boxcar) at the right.

F(t): click this checkbox to compute measurements on differentiated, double-differentiated, integrated, or normalized waves.

Display: click this checkbox to customize the way results are displayed (lines and text) within the channel graphs.

t_offset: click this checkbox to create a wave of time offset (shift) values for each of your data waves or each of your groups. For example, if you have paired-pulse data in which the interval between pulses is incremented in steps of 10 msec, create a group offset wave by clicking the t_offset checkbox and enter 0, 10, 20, 30... into the group wave that appears in the offset table (here, wave indexes denote the group number). Now, step through your data using NeuroMatic’s increment controls (<>); you should see your Stats1 measurement windows in the channel graph shift in steps of 10 msec.

Win: Use this drop-down menu to define up to 10 independent Stats1 measurement windows.

Edit: if you have multiple windows to define, click this button to edit Stats1 parameters in a table to make life easier.

All Waves: click to this button to compute measurements on all currently selected channels and waves. Results are displayed in a Stats1 table.

All Win: if you have more than one Stats1 window defined, and you only want to measure “All Waves” on the currently selected Stats1 window, unclick this checkbox.

Stats1 Waves are created in the current data folder with the following Name Convention: “ST_” + Measurement X/Y + Stats1 Window Number + Wave Select String + Channel + Overwrite Sequence Number (i.e. “ST_MaxY0_RAll_A0”).

Stats2

Stats2 Wave Select: choose the wave to analyze in this drop-down menu (upper left); its wave statistics will appear below (AVG, SDV, SEM and NUM).

Stats2 Wave Select Modifier: use this drop-down menu (upper right) to control the list of waves currently displayed in the Stats2 Wave Select menu. Use “All” to list all Stats1 and Stats2 waves. Use “Any” to list all waves in the current data folder. Select a window, such as “Win0”, to list only those Stats1 waves computed for that window.

Plot: click this checkbox to automatically plot a wave once selected.

Wave Select Filter: click this checkbox if you wish to display analysis results for only those waves currently selected by NeuroMatic’s Wave Select.

Save click this button to save current results to a Stats2 table.

All Waves: click this button to compute statistics for all waves listed in the Stats2 Wave Select menu and save results to a Stats2 table.

Function: choose a function to perform on the currently selected wave, such as “Plot”, “Histogram”, “Sort” or “Stability”.

Sort: use this function to determine the “successes” or “failures” of the currently selected wave. For example, one might define a Max amplitude >= 2 nA as success, and anything smaller as failure. The Sort function will then produce an output wave of the same dimension as the input wave, with point value 1 for success or 0 for failure. Note that Sort waves are by definition a Set wave, which means you can use them to limit your data analysis using Neuromatic’s Wave Select.

Stability: use this function to compute the stability/stationarity of the currently selected wave. This function was provided by the Laboratory of Synaptic Transmission and Information Processing at University College London, and was derived from a Spearman Rank-Order macro from Numerical Recipes.

Delete NANs: use this function if you want to remove all the NAN’s (Not-A-Number), or empty spaces, from the currently selected wave. This function does not overwrite your original wave but rather creates a new wave whose name begins with the prefix “ST2_”. Select “Stats2” in the Stats2 Wave Select Modifier to analyze this new wave.