Hello, I am trying to analyze response time data from a study someone else ran. The person who originally programmed the task is not available, which is why I am turning to this forum to see if anyone could help me get the correct timing measure. 

Please see below for how the item looks. It is a drop-down item. It has two drop-down menus referred as "operator1" and "operator2". It has two options (e.g., "option1_1" and "option1_2") under each menu.



Please see below for a sample latency data from this item. My understanding of the data is that a participant clicked the first drop-down menu ("operator1") three times and selected the first option ("option1_1") under the menu, then clicked the second drop-down menu ("operator2") and selected the first option ("option1_2") under the menu. 



Here's my question: I am trying to compute how long the person took to solve this item until clicking Submit button. When I sum all the number under "latency" column except for the "200" (clearscreen), it is 22181 (4119 + 722 + ... 4057). Is this the correct way to compute this measure? The above shows all the events that occurred in this item. I am assuming that each latency value shows how long the person took between one action and the preceding action. 


Please see below for the script for this item: 

<values>
/ op1 = ""
/ op2 = ""
</values>

<defaults>
/ fontstyle = ("Calibri", 3.5%)
</defaults>

<block myblock>
/ trials = [1=DC1]
</block>

<trial DC1>
/ stimulusframes = [1=digit1, operator1, digit2, digit3, operator2, digit4, submit]
/ inputdevice = mouse
/ validresponse = (operator1, operator2, submit)
/ isvalidresponse = [(trial.DC1.response == "submit" && values.op1 !="" && values.op2 !="")
  || trial.DC1.response == "operator1" || trial.DC1.response == "operator2"]
/ branch = [if (trial.DC1.response == "operator1") trial.select_operator1]
/ branch = [if (trial.DC1.response == "operator2") trial.select_operator2]
</trial>

<trial select_operator1>
/ ontrialend = [if (trial.select_operator1.response == "option1_1") values.op1 = "2"]
/ ontrialend = [if (trial.select_operator1.response == "option2_1") values.op1 = "3"]
/ stimulusframes = [1=operator1,option1_1,option2_1]
/ inputdevice = mouse
/ validresponse = (operator1,option1_1,option2_1)
/ branch = [trial.DC1]
</trial>

<trial select_operator2>
/ ontrialend = [if (trial.select_operator2.response == "option1_2") values.op2 = "3"]
/ ontrialend = [if (trial.select_operator2.response == "option2_2") values.op2 = "4"]
/ stimulusframes = [1=operator2,option1_2,option2_2]
/ inputdevice = mouse
/ validresponse = (operator2,option1_2,option2_2)
/ branch = [trial.DC1]
</trial>

<text digit1>
/ items = ("Bill has a choice of")
/ position = (20%, 40%)
/ erase = false
/ size = (20%, 10%)
/ hjustify = left
/ vjustify = center
</text>

<text digit2>
/ items = ("kinds of rolls and")
/ position = (48%, 40%)
/ size = (20%, 10%)
/ erase = false
/ hjustify = left
/ vjustify = center
</text>

<text digit3>
/ items = ("varieties of meat for his sandwich.")
/ position = (80%, 40%)
/ erase = false
/ size = (30%, 10%)
/ hjustify = left
/ vjustify = center
</text>

<text digit4>
/ items = ("If he chooses one type of roll and one type of meat, he can make 6 types of sandwiches.")
/ position = (50%, 50%)
/ erase = false
/ size = (80%, 10%)
/ hjustify = left
/ vjustify = center
</text>

<text operator1>
/ items = ("<%values.op1%>")
/ position = (32%, 40%)
/ size = (10%, 10%)
/ txbgcolor = silver
/ erase = false
/ hjustify = center
/ vjustify = center
</text>

<text operator2>
/ items = ("<%values.op2%>")
/ position = (59%, 40%)
/ size = (10%, 10%)
/ txbgcolor = silver
/ erase = false
/ hjustify = center
/ vjustify = center
</text>

<text submit>
/ items = ("SUBMIT")
/ position = (50%, 92%)
/ size = (20%, 10%)
/ txbgcolor = grey
/ erase = false
/ hjustify = center
/ vjustify = center
</text>

<text option1_1>
/ items = ("2")
/ position = (32%, 50%)
/ size = (10%, 10%)
/ txbgcolor = lightgrey
/ hjustify = center
/ vjustify = center
</text>

<text option2_1>
/ items = ("3")
/ position = (32%, 60%)
/ size = (10%, 10%)
/ txbgcolor = lightgrey
/ hjustify = center
/ vjustify = center
</text>

<text option1_2>
/ items = ("3")
/ position = (59%, 50%)
/ size = (10%, 10%)
/ txbgcolor = lightgrey
/ hjustify = center
/ vjustify = center
</text>

<text option2_2>
/ items = ("4")
/ position = (59%, 60%)
/ size = (10%, 10%)
/ txbgcolor = lightgrey
/ hjustify = center
/ vjustify = center
</text>

<trial clearscreen>
/ stimulusframes = [1=clearscreen]
/ trialduration = 200
/ validresponse = (0)
</trial>

<shape clearscreen>
/ color = white
/ shape = rectangle
/ size = (100%, 100%)
</shape>

I remember that script's genesis ( cf. https://www.millisecond.com/forums/FindPost24890.aspx ) and I've explained what the various trials do / what the latencies reflect here: https://www.millisecond.com/forums/FindPost24989.aspx

And yes, if you want something that reflects the total time it took the participant to solve the item --  from the inital display of the item until hitting "submit" --, then you would simply sum up those latencies: