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Jun 11, 2018 4:59 PM
(615 views)

Okay. So when looking at the selected area only. I would want:

Nback#=1, duration=14303912, Cumulative Duration=0

Nback#=2, duration=14305914, Cumulative Duration=2002

Nback#=3, duration=14307916, Cumulative Duration=4004

Nback#=4, duration=14309965, Cumulative Duration=6053

Nback#=5, duration=14312015, Cumulative Duration=8103

Nback#=6, duration=14314051, Cumulative Duration=10139

I need to make this final column as a measure of time. Any guidance would be greatly appreciated.

7 REPLIES

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Jun 12, 2018 3:18 AM
(584 views)

This script might be what you need. Data set as the attchment.

```
dt = Current Data Table();
//dt << New Column( "Delta", numeric );
dt << New Column( "Cumulative", numeric );
dt << Sort( By( :Category, :Time ), Order( Ascending, Ascending ), Replace table );
For( i = 1, i <= N Rows( dt ), i++,
If( :Time[i] == Min( :Time[dt << get rows where( :Category == :Category[i] )] ),
//dt:Delta[i] = 0;
dt:Cumulative[i] = 0;
,
//dt:Delta[i] = dt:Time[i] - dt:Time[i - 1];
dt:Cumulative[i] = dt:Cumulative[i-1]+ (dt:Time[i] - dt:Time[i - 1]);
)
);
```

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##### Re: Creating Time Variable

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Jun 12, 2018 1:14 PM
(566 views)

Here is a way to do this with just column formulas. I'm not sure which column you are using to indicate the time reset, so I included

- A method to do this from either a column whose values changes for each new group, and
- A method based on a column that indicates a reset in time.

```
Names default to here ( 1 );
//Table with data similar to yours
dt = New Table( "Data",
Add Rows( 40 ),
New Column( "Space", Numeric, "Continuous",
Format( "Best", 12 ),
Formula( Round( Random Uniform( 1, 5 ), 0 ) )
),
New Column( "Duration", Numeric, "Continuous",
Format( "Best", 12 ),
Formula( Round( Random Uniform( 1998, 2002 ), 0 ) )
),
New Column( "Start", Numeric, "Continuous",
Format( "Best", 12 ),
Formula( If( Row() == 1, :Space, :Space + Lag( :Start, 1 ) + Lag( :Duration, 1 ) ) )
),
New Column( "End", Numeric, "Continuous",
Format( "Best", 12 ),
Formula( :Start + :Duration )
),
New Column( "Period Indication", Character, "Nominal",
Formula( If( Row() < 15, "One", "Two" ) )
),
New Column( "Indication of Time Reset Pulse", Numeric, "Nominal",
Formula( If( Row() == 10, 1, . ) )
)
);
//New Column - subtract the current end time from the first end time in
//the group. Use this if the column :summary_image_end" tells you when
//to start a new group
dt << New Column( "Time In Group", Numeric, "Continuous",
Format( "Best", 12 ),
Formula( :End - Col Min( :Start, :Period Indication ) )
);
//Make a New Column indicating the period for a pulse signal, use this if
//the column Lag1 tells you when to start a new group
dt << New Column( "Period Indication from Pulse", Numeric, "Nominal",
Format( "Best", 12 ),
Formula(
If(
Row() == 1,
1,
Lag( :Period Indication from Pulse, 1 ) +
If(
Is Missing( :Indication of Time Reset Pulse ),
0,
1
)
)
)
);
//Once the group column is made then calculate the duration
dt << New Column( "Time In Group - Pulse", Numeric, "Continuous",
Format( "Best", 12 ),
Formula( :End - Col Min( :Start, :Period Indication from Pulse ) )
);
```

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Jun 18, 2018 11:14 AM
(499 views)

So upon looking at the data that I have I realized that I have a 'Nback Duration' Column. I was wondering if there would be an easier way to get to the desired end result using this column and the lag1 column.

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Jun 19, 2018 7:40 PM
(472 views)

You could sum up the durations however you might miss the time between rows. In my opinion using the Start and End Times (Nback Start and Nback Stop and summary_image_end) is fairly succinct. The formula should just have to be as shown below. You would use *either* the blue columns (if you care about summary_image_end) or the red columns (if you care about Lag1).

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Jun 21, 2018 6:56 AM
(448 views)

So, this works technically. It does give me values, but it does not rest at the beginning of each trial. This is an important step in this process so that I am able to compare across each individual trial. The current script allows me to compare overtime generally, not within each of the individual trials. This is why I would like to have each new trial start at 0 time.

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Jun 23, 2018 1:40 PM
(409 views)

Maybe you want to start counting from the end time of the first row in each period?

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Jun 25, 2018 4:15 PM
(389 views)

So, making this small change still produces the same sort of output for my new variable.