Error while running normOffsets in diffhic
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shopnil99 • 0
@shopnil99-20966
Last seen 2.1 years ago

I ran the following code to create and filter my "data" object:

data <- squareCounts(input, hg19.param, width=bin.size, filter=1)

keep <- aveLogCPM(asDGEList(data)) > 0

data <- data[keep,]

When I tried normalizing the filtered data using the following command I get the error below

data <- normOffsets(data, type="loess", se.out=TRUE)

Error in loessFit (log (mat [, x] + cont.cor.scaled [x]), ab, …) : unused argument (type = “loess” )

I tried running it on the initial data object and get the same error. Any ideas about how I can troubleshoot this error?

diffhic csaw • 483 views
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On quick glance, it looks like the documentation might be misleading. while the documentation indeed shows

     ...: Other arguments to be passed to 'calcNormFactors' for
          'type="scaling"', or 'loessFit' for 'type="loess"'.

When I examine the code the extra arguments appear to be passed to the loessFit function not calcNormFactors. So see ?loessFit for acceptable arguments to pass for ...

I think if you change type = "loess" to method="loess" it should work. It might also be worth reporting to the package maintainers to update their documentation.

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Thank you! changing type = "loess" to method="loess" worked out really well.

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Aaron Lun ★ 27k
@alun
Last seen 6 hours ago
The city by the bay

Pretty much as Lori said. The user's guide is (slightly) out of date, and I haven't had the opportunity to regenerate it, mostly because I no longer have access to the underlying files that are required for its generation.

In the meantime, the solution is to not use type="loess" when calling normOffsets(), as this function will always do a loess fit. (Conversely, normFactors() will always perform scaling normalization.) I separated the two modes of operation into different functions to avoid confusion, but must have missed an argument update.

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thank you for the explanation Aaron.

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From what I gather in reading the documentation for csaw (like diffHic, csaw is another R package from Aaron Lun), this is also the case for normOffsets(), i.e., the function always does a loess fit. Is that correct? I ask because I ran into a similar error when using csaw.

(I apologize if this should be its own independent post; if so, please let me know, then I will delete this and make a new post. Thanks for any clarification and for your great packages.)

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Yes, now it will always do a loess fit. (diffHic just calls csaw under the hood, so they're using the same function in both packages.) Is there some out-of-date documentation somewhere?

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Thank you, no, I don't think so. I encountered the error when running through some open-source ChIP-seq analysis code that was written to use an earlier version of csaw.

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