missing-data

问题 I am trying to fill missing data based on whether the previous and last NA value are the same. For example, this is the dummy dataset: df <- data.frame(ID = c(rep(1, 6), rep(2, 6), rep(3, 6), rep(4, 6), rep(5, 6), rep(6, 6), rep(7, 6), rep(8, 6), rep(9, 6), rep(10, 6)), with_missing = c("a", "a", NA, NA, "a", "a", "a", "a", NA, "b", "b", "b", "a", NA, NA, NA, "c", "c", "b", NA, "a", "a", "a", "a", "a", NA, NA, NA, NA, "a", "a", "a", NA, "b", "a", "a", "a", "a", NA, NA, "a", "a", "a", "a", NA,

问题 All, I have a question that I fear might be too pedestrian to ask here, but searching for it elsewhere is leading me astray. I may not be using the right search terms. I have a panel data frame (country-year) in R with some missing values on a given variable. I'm trying to impute them with the value from another vector in another data frame. Here's an illustration of what I am trying to do. Assume Data is the data frame of interest, which has missing values on a given vector that I'm trying

问题 All, I have a question that I fear might be too pedestrian to ask here, but searching for it elsewhere is leading me astray. I may not be using the right search terms. I have a panel data frame (country-year) in R with some missing values on a given variable. I'm trying to impute them with the value from another vector in another data frame. Here's an illustration of what I am trying to do. Assume Data is the data frame of interest, which has missing values on a given vector that I'm trying

问题 Just curious to know if there is a proc or a function that can automatically generate MAR situation in SAS. 来源： https://stackoverflow.com/questions/22025939/is-there-a-proc-to-generate-a-missing-at-random-situation-in-sas

问题 The problem: With All/Combined selected from the top menu within either the Project or the Target, this is what I see. Debug used to be listed within the Provisioning Profile and Code Signing Identity sections, but it is now missing. I can build a run on the simulator like this but when trying to deploy to a tethered testing device I get errors about provisioning profile and code signing being required. This is not a duplicate of 'Provisioning profile' options missing from 'Code signing'

问题 The problem: With All/Combined selected from the top menu within either the Project or the Target, this is what I see. Debug used to be listed within the Provisioning Profile and Code Signing Identity sections, but it is now missing. I can build a run on the simulator like this but when trying to deploy to a tethered testing device I get errors about provisioning profile and code signing being required. This is not a duplicate of 'Provisioning profile' options missing from 'Code signing'

问题 I have a sparse matrix in AMPL. As a result, it includes a lot of values that are coded as ".". The "." value in AMPL means "no value specified here." When I try to solve the optimization problem I get a message reading "no value specified for..." in reference to the cells containing the "." consequently, it won't solve the problem. However, when I try to specify a default value to replace the ".", the problem churns and churns and doesn't solve. Is there any way I can set restrictions on the

问题 here is a small example where I want to deal with missing values on custom functions on series. suppose that i have obtained a series series4;; val it : Series<int,int opt> = 1 -> 1 2 -> 2 3 -> 3 4 -> <missing> for example, this way: let series1 = Series.ofObservations [(1,1);(2,2);(3,3)] let series2 = Series.ofObservations [(1,2);(2,2);(3,1);(4,4)] let series3 = series1.Zip(series2,JoinKind.Outer);; let series4 = series3 |> Series.mapValues fst Then if i do, Series.mapAll (fun v -> match v

问题 This answer has shown me how to get annual changes from data: UPDATE values_table as a join values_table as b ON b.date_sampled = DATE_SUB(a.date_sampled, INTERVAL 1 YEAR) set a.annual_change = a.sample_value - b.sample_value And this answer has shown me how to find the closest date to an INTERVAL (relative to NOW() with 3 results, in this question's case): SELECT event_id FROM Table ORDER BY ABS( DATEDIFF( EVENT_START_DATE, NOW() ) ) LIMIT 3 How can the two be combined to get annual rates of

问题 This answer has shown me how to get annual changes from data: UPDATE values_table as a join values_table as b ON b.date_sampled = DATE_SUB(a.date_sampled, INTERVAL 1 YEAR) set a.annual_change = a.sample_value - b.sample_value And this answer has shown me how to find the closest date to an INTERVAL (relative to NOW() with 3 results, in this question's case): SELECT event_id FROM Table ORDER BY ABS( DATEDIFF( EVENT_START_DATE, NOW() ) ) LIMIT 3 How can the two be combined to get annual rates of