na Questions
1
Solved
Consider the following toy data and computations:
library(dplyr)
df <- tibble(x = 1)
stats::sd(df$x)
dplyr::summarise(df, sd_x = sd(x))
The first calculation results in NA whereas the seco...
2
To simplify, I have a data set which is as follows:
b <- 1:6
# > b
# [1] 1 2 3 4 5 6
jnk <- c(2, 4, 5, NA, 7, 9)
# > jnk
# [1] 2 4 5 NA 7 9
When I try:
cor(b, jnk, na.rm=TRUE)
I g...
4
I have a data.table with 57m records and 9 columns, one of which is causing a problem when I try to run some summary stats. The offending column is a factor with 3699 levels and I am receiveing an ...
4
Solved
I want to represent the structure of a data frame (or matrix, or data.table whatever) on a single plot with color-coding. I guess that could be very useful for many people handling various types of...
Lection asked 18/12, 2014 at 11:23
1
Solved
On a given double vector, how come I can define -999 to NA by
v[v == -999] <- NA
but not
v[v == NaN] <- NA
and how do I convert NaN's to NA's correctly?
1
Solved
I try to make a barplot with ggplot2 and am facing some issues with defining the color for NA.
ggh <- ggplot(data=dat, aes(x=var1, fill=var2))+
geom_bar(position="dodge")+
scale_fill_manual(
...
4
Solved
I am trying to implement Chebyshev filter to smooth a time series but, unfortunately, there are NAs in the data series.
For example,
t <- seq(0, 1, len = 100)
x <- c(sin(2*pi*t*2.3) + 0.2...
Politic asked 18/7, 2012 at 12:27
1
Solved
I am trying to replace NA values for a specific set of columns in my tibble. The columns all start with the same prefix so I am wanting to know if there is a concise way to make use of the starts_w...
1
Solved
I am relatively new to R. I have a dataframe that has a column stored as a list. My column contain c("Benzo", "Ferri") or character(0) if it's empty. How can I change them to simply Benzo, Ferri an...
3
Solved
As explained here when the test condition in ifelse(test, yes, no) is NA, the evaluation is also NA. Hence the following returns...
df <- data.frame(a = c(1, 1, NA, NA, NA ,NA),
b = c(NA, NA, ...
Lixiviate asked 7/6, 2017 at 10:56
2
Solved
I'm very new to R (moving over from SPSS). I'm using RStudio on a Mac running Mavericks. Please answer my question in words of 2 syllables as this is my first real attempt at anything like this. I'...
2
Solved
Why would this operation fail?
For example:
a = pd.DataFrame({'a': [1,2,np.nan, np.nan],
'b': [5,np.nan,6, np.nan],
'c': [5, 1, 5, 2]})
a[['a', 'b']].fillna(0, inplace=True)
and gave me this...
6
Solved
I'm looking for something similar to na.locf() in the zoo package, but instead of always using the previous non-NA value I'd like to use the nearest non-NA value. Some example data:
dat <- c(1,...
Seigniorage asked 9/4, 2012 at 17:53
2
Solved
specifying "skip NA" when calculating mean of the column in a data frame created by Pandas
I am learning Pandas package by replicating the outing from some of the R vignettes. Now I am using the dplyr package from R as an example:
http://cran.rstudio.com/web/packages/dplyr/vignettes/int...
1
Solved
Consider the following example:
require(tibble)
require(dplyr)
set.seed(42)
tbl <- data_frame(id = letters[1:10], val = c(runif(5), NA, runif(4)))
tbl
# A tibble: 10 × 2
id val
<...
5
Solved
I would like to replace up to n consecutive NA values in vector with latest non-NA value.
For example, if:
a <- c(1,NA,NA,NA,NA,NA,2,NA,1,NA,NA,NA)
n <- 2
I would like to obtain:
c(1,1,1,NA,...
2
Solved
I have a very messy dataframe (webscraped) that unfortunately has many double and even triple entries in it. Most of the dataframe looks like this:
> df1<-data.frame(var1=c("a","a","b","b","...
3
Solved
I need to delete leading and trailing missing values (NA) from a vector. NAs between numbers should be kept. Note that my next step is index another vector without NA and keep only values with the ...
Hurdle asked 13/3, 2017 at 8:15
3
Solved
How could I Replace a NA with mean of its previous and next rows in a fast manner?
name grade
1 A 56
2 B NA
3 C 70
4 D 96
such that B's grade would be 63.
2
Solved
I have got a map with a legend gradient and I would like to add a box for the NA values. My question is really similar to this one and this one. Also I have read this topic, but I can't find a "nic...
3
Solved
For example, I have this data frame (df):
Color X1 X2 X3 X4
Red 1 1 0 2
Blue 0 NA 4 1
Red 3 4 3 1
Green 2 2 1 0
I would like to create a function that counts up the number of non-NAs in "X2&...
2
Solved
I've just started with R and I've executed these statements:
library(datasets)
head(airquality)
s <- split(airquality,airquality$Month)
sapply(s, function(x) {colMeans(x[,c("Ozone", "Solar.R", ...
3
Solved
I have a data.frame that has 100 variables. I want to get the sum of three variables only using mutate (not summarise).
If there is NA in any of the 3 variables, I still want to get the sum. In or...
3
Solved
I have a dataframe that has a scattering of NA's
toy_df
# Y X1 X2 Label
# 5 3 3 A
# 3 NA 2 B
# 3 NA NA C
# 2 NA 6 B
I want to group this by the label field, and count how many non NA values are...
1
Solved
I have a huge data set and want to predict (not replace) missing values with a machine learning algorithm like svm or random forest in python.
My data set looks like this:
ID i0 i1 i2 i3 i4 i5 ...
Contradict asked 6/12, 2016 at 13:1
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