diff --git a/man/ncd1.Rd b/man/ncd1.Rd
index 6702d4a..653ffc5 100644
--- a/man/ncd1.Rd
+++ b/man/ncd1.Rd
@@ -4,31 +4,81 @@
 \alias{ncd1}
 \title{Calculate non-central statistic (NCD1)}
 \usage{
-ncd1(x = x, tf = 0.5, w = 3000, ncores = 2, minIS = 2, by = "POS")
+ncd1(
+  x = x,
+  tf = 0.5,
+  fold = T,
+  w = 3000,
+  by.snp = TRUE,
+  mid = FALSE,
+  ncores = 2,
+  selectwin = "val",
+  targetpos = NULL,
+  minIS = 2,
+  label = NULL,
+  verbose = T
+)
+
+ncd1(
+  x = x,
+  tf = 0.5,
+  fold = T,
+  w = 3000,
+  by.snp = TRUE,
+  mid = FALSE,
+  ncores = 2,
+  selectwin = "val",
+  targetpos = NULL,
+  minIS = 2,
+  label = NULL,
+  verbose = T
+)
 }
 \arguments{
-\item{x}{A data.table object with
-columns: CHR, POS, REF, ALT, tx_1 (number of alternate allele copies),
-tn_1 (total number of alleles).}
+\item{x}{A data.table object}
+
+\item{tf}{Target frequency}
+
+\item{fold}{Logical. If TRUE, NCD1 will use minor allele frequencies.}
+
+\item{w}{Window size in bp. Default is 1000}
+
+\item{by.snp}{Logical. If TRUE, windows are defined around each SNP
+in the input data. Else, slidding windows in the range first pos:last pos
+will be used.}
+
+\item{mid}{Logical. If TRUE runs NCD centered on a core SNP frequency instead of a pre-defined tf. Requires targetpos.}
 
-\item{tf}{Target frequency.}
+\item{ncores}{Number of cores. Increasing this can spead things up for you.
+Default is 4.}
 
-\item{w}{Window size in bp. Default is 3000.}
+\item{selectwin}{Select window. "val" returns the window with the lowest test. "maf" returns the window
+which has the lowest difference between its central MAF and the tf."mid" returns the window
+centered closest on a value provided by the user under targetpos."all" returns all windows (idea for when the user wants to select windows after scanning a genome)}
 
-\item{ncores}{Number of cores. Increasing this can speed things up for you.
-Default is 2.}
+\item{targetpos}{Position of the target SNP. Only needed for mid==T}
 
 \item{minIS}{Minimum number of informative sites. Default is 2. Windows with
 less informative sites than this threshold are discarded.}
 
+\item{label}{An optional label to include as the last column of the output. Defaults to value in selectwin.}
+
+\item{verbose}{Logical. If TRUE, progress reports will be printed as the
+function runs.}
+
 \item{by}{Define how to scan the genome. "POS" (default) defined sliding windows based on w. "IS" defined windows around each informative site.}
 }
 \value{
 A data.table object with columns:  Win.ID, S (sites), IS (informative sites), tf, ncd1
+
+A data.table object
 }
 \description{
+Calculate non-central statistic (NCD1)
+
 Calculate non-central statistic (NCD1)
 }
 \examples{
 ncd1(x=ncd1_input, tf=0.5, w=3000, ncores=2, minIS=8)
+ncd1(x=ncd1_input, selectwin="mid", targetpos=15000, mid=TRUE)
 }
diff --git a/man/ncd2.Rd b/man/ncd2.Rd
index b088dcc..f8d312e 100644
--- a/man/ncd2.Rd
+++ b/man/ncd2.Rd
@@ -4,29 +4,60 @@
 \alias{ncd2}
 \title{Calculate non-central statistic (NCD2)}
 \usage{
-ncd2(x = x, tf = 0.5, w = 3000, ncores = 2, minIS = 2, by = "POS")
+ncd2(
+  x = x,
+  tf = 0.5,
+  fold = T,
+  w = 3000,
+  by.snp = TRUE,
+  mid = FALSE,
+  ncores = 2,
+  selectwin = "val",
+  targetpos = NULL,
+  minIS = 2,
+  label = NULL,
+  verbose = T
+)
 }
 \arguments{
-\item{x}{A data.table object with
-columns: CHR, POS, REF, ALT, tx_1 (number of alternate allele copies), tn_1 (total number of alleles), tx_2, and tn_2.}
+\item{x}{A data.table object}
 
-\item{tf}{Target frequency. Any value between 0 and 0.5. Default is 0.5.}
+\item{tf}{Target frequency}
 
-\item{w}{Window size in bp. Default is 1000.}
+\item{fold}{Logical. If TRUE, NCD2 will use minor allele frequencies.}
 
-\item{ncores}{Number of cores. Increasing this can speed things up for you.
-Default is 2.}
+\item{w}{Window size in bp. Default is 1000}
+
+\item{by.snp}{Logical. If TRUE, windows are defined around each SNP
+in the input data. Else, slidding windows in the range first pos:last pos
+will be used.}
+
+\item{mid}{Logical. If TRUE runs NCD centered on a core SNP frequency instead of a pre-defined tf. Requires targetpos.}
+
+\item{ncores}{Number of cores. Increasing this can spead things up for you.
+Default is 4.}
+
+\item{selectwin}{Select window. "val" returns the window with the lowest test. "maf" returns the window
+which has the lowest difference between its central MAF and the tf."mid" returns the window
+centered closest on a value provided by the user under targetpos."all" returns all windows (idea for when the user wants to select windows after scanning a genome)}
+
+\item{targetpos}{Position of the target SNP. Only needed for mid==T}
 
 \item{minIS}{Minimum number of informative sites. Default is 2. Windows with
-less informative sites than this threshold are discarded.
-#' @param by Define how to scan the genome. "POS" (default) defined sliding windows based on w. "IS" defined windows around each informative site.}
+less informative sites than this threshold are discarded.}
+
+\item{label}{An optional label to include as the last column of the output}
+
+\item{verbose}{Logical. If TRUE, progress reports will be printed as the
+function runs.}
 }
 \value{
-A data.table object with columns: TO DO
+A data.table object
 }
 \description{
 Calculate non-central statistic (NCD2)
 }
 \examples{
-ncd2(x=ncd2_input, tf=0.5, w=3000, ncores=2, minIS=8)
+ncd2(x=ncd2_input, selectwin="mid", targetpos=15000, mid=TRUE)
+ncd2(x=ncd2_input, selectwin="val", targetpos=NULL, mid=F)
 }
diff --git a/renv.lock b/renv.lock
new file mode 100644
index 0000000..a939df2
--- /dev/null
+++ b/renv.lock
@@ -0,0 +1,1463 @@
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