[R] object '---' not found

[MLE]

Hi, 
I am very new to R and the stats world. I have enjoyed working with R so far
but I have come across an error message in a very simple command that I am
unable to resolve. 

I bring data in through excel .csv files and check them to be sure R reads
them correctly and has everything assigned as it is in the excel file. It
looks good. But simple computations are not working

> sd(VIQ)
Error in sd(VIQ) : object 'VIQ' not found

I copied the object out of the R table of the data, I know it is correct. 

Thank you in advance and for understanding my greenness.

Emily

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