I am working with climate data in New Mexico and I am an R novice. I am trying to replace NA with means but there are 37 different sites in my df. I want the means of the column for which the DF$STATION.NAME (in column 1) is unique. I cant be using data from one location to find the mean of another... obviously. so really I should have a mean for each month, for each station.
My data is organized by station.name vertically in column 1 and readings for months jan-dec in columns following, including a total column at the end (right). readings or observations are for each station for each month, over several years (station name listed in new row for each new year.)
I need to replace the NAs with the sums of the CLDD for the given month within the given station.name, how do I do this?
Try asking that question on https://stats.stackexchange.com/ (as suggested by the statistics tag), there are probably more R users there than on the general programming site. I also added the r tag to your question.
There is nothing wrong with splitting your data into station-month subsets, filling the missing values there, then reassembling them into one big matrix!
See also:
Replace mean or mode for missing values in R
Note that the common practice of filling missing values with means, medians or modes is popular, but may dilute your results since this will obviously reduce variance. Unless you have a strong physical argument why and how the missing values can be interpolated, it would be more elegant if you could find a way that can deal with missing values directly.
Related
It is hard to explain this without just showing what I have, where I am, and what I need in terms of data structure:
What structure I had:
Where I have got to with my transformation efforts:
What I need to end up with:
Notes:
I've not given actual names for anything as the data is classed as sensitive, but:
Metrics are things that can be measured- for example, the number of permanent or full-time jobs. The number of metrics is larger than presented in the test data (and the example structure above).
Each metric has many years of data (whilst trying to do the code I have restricted myself to just 3 years. The illustration of the structure is based on this test). The number of years captured will change overtime- generally it will increase.
The number of policies will fluctuate, I've just labelled them policy 1, 2 etc for sensitivity reasons and limited the number whilst testing the code. Again, I have limited the number to make it easier to check the outputs.
The source data comes from a workbook of surveys with a tab for each policy. The initial import creates a list of tibbles consisting of a row for each metric, and 4 columns (the metric names, the values for 2024, the values for 2030, and the values for 2035). I converted this to a dataframe, created a vector to be a column header and used cbind() to put this on top to get the "What structure I had" data.
To get to the "Where I have got to with my transformation efforts" version of the table, I removed all the metric columns, created another vector of metrics and used rbind() to put this as the first column.
The idea in my head was to group the data by policy to get a vector for each metric, then transpose this so that the metric became the column, and the grouped data would become the row. Then expand the data to get the metrics repeated for each year. A friend of mine who does coding (but has never used R) has suggested using loops might be a better way forward. Again, I am not sure of the best approach so welcome advice. On Reddit someone suggested using pivot_wider/pivot_longer but this appears to be a summarise tool and I am not trying to summarise the data rather transform its structure.
Any suggestions on approaches or possible tools/functions to use would be gratefully received. I am learning R whilst trying to pull this data together to create a database that can be used for analysis, so, if my approach sounds weird, feel free to suggest alternatives. Thanks
This might be a stupid question. I have some 'NA' in a matrix, I need to put this matrix into jags model, but I want to remove those NA. Can I remove only NA but keep the rest of the data?
My data looked like the picture below. Can I have rows with different column numbers?
You cannot.
You need to impute these missing values or remote either the column or the row entirely.
Imputing missing values is as complicated as you want it to be. You'd be best of looking into the first few google searches on the topic or just using the mean value of the column.
I have the question that is linked to the financial data of stock (open price, close close, high, low). Since the data which we download are not always the similar one, it's the problem to automize the code where this data are used.
F.E. sometimes I download the data that have the next columns:
open close high low
Sometimes this columns may be names as:
open_ask close_bid high low
Is there function in R which allows to work with data, where the columns may be named similar but not exactly same name? F.e. I want to plot the candle chart, and it's required that R may use the necessary column, where the open and close price are.
You could try identifying columns in your data frame using a regex which provides a logical match. For example, to match the open or open_ask columns, you could use:
open_col <- df[, grepl("open", names(df))]
If the names cannot be correlated in any meaningful way, then you might be able to go by position. But this runs the risk of error should columns shift position, whereas a regex works regardless of where a potentially matching column is positioned.
I hope this has not been answered, but when I search for a solution to my problem I am not getting any results.
I have a data.frame of 2000+ observations and 20+ columns. Each row represents a different observation and each column represents a different facet of data for that observation. My objective is to iterate through the data.frames and select observations which match criteria (eg. I am trying to pick out observations that are in certain states). After this, I need to subtract or add time to convert it to its appropriate time zone (all of the times are in CST). What I have so far is an exorbitant amount of subsetting commands that pick out the rows that are of the state being checked against. When I try to write a for loop I can only get one value returned, not the whole row.
I was wondering if anyone had any suggestions or knew of any functions that could help me. I've tried just about everything, but I really don't want to have to go through each state of observations and modify the time. I would prefer a loop that could easily go through the data, select rows based on their state, subtract or add time, and then place the row back into its original data.frame (replacing the old value).
I appreciate any help.
Probably a pretty basic question, and hopefully one not repeated elsewhere. I’m looking at some ISSP survey data in R, and I made a separate data frame for respondents who answered “Government agencies” on one of the questions:
gov.child<-data[data$"V33"=="Government agencies",]
Then I used the table function to see how many total respondents answered that way in each country (C_ALPHAN is the variable name for country):
table(gov.child$C_ALPHAN)
Then I made a matrix of this table:
gov.child.matrix<-as.matrix(table(gov.child$C_ALPHAN))
So I now have a two-column matrix with just the two-letter country code (the C_ALPHAN code) and the number of people who answered “Government agencies.” But I want to know what percentage of respondents in those countries answered that way, so I need to divide this number by the total number of respondents for that country.
Is there some way (a function maybe?) to, after adding a new column, tell R that for each row, it has to divide the number in column two by the total number of rows in the original data set that correspond to the country code in column one (i.e., the n for that country)? Or should I just manually make a vector with the n for each country, which is available on the ISSP website, and add it to the matrix? I'm loathe to to that because of the possibility of making a data entry error, but maybe that's the best way.