I writing sample code for colleagues in developing countries who will use it to analyze a multi-stage, cluster-sample survey that measures the prevalence of infection with soil-transmitted intestinal worms. So far, I have used three of the software packages they might use: IBM SPSS Statistics (I...
I'm trying out the PROC CALIS LINEQS example from here using the Wheaton dataset (it works using the PATH and RAM examples), but when I use this code:
proc calis nobs=932 data=Wheaton;
Anomie67 = 1.0 * f_Alien67 + E1,
Powerless67 = 0.833 * f_Alien67 + E2...
Let's say I have an experiment with a total of 10 petridishes each with 20 seeds. 5 of these petri dishes are variety A and 5 are variety B. I count the number of germinated seeds in each dish. There seems to be to be two main ways to model potential over dispersion:
proc glimmix data=a...
I have a question about how to conduct multi-level analysis in glimmix.
I have administered a peer nomination survey to a group of elementary students. The students were asked to indicate if their fellow classmates matched a series of descriptions (let's just label them, X, Y, and Z)...
I’ve been tasked by my company to forecast the amount of phone calls on an hourly basis during the company’s opening hours.
That all went pretty well - until I realized, that my company’s opening hours for phone calls is 9am to 3pm (6 hours total) on Mondays and 9am to...
Very grateful for any advice.
I'm trying to perform Cox regression on a data set with multiple random missing values. SPSS is my go-to software, but the Cox regression algorithm applies LISTWISE deletion to all cases with missing values, resulting in omission of >30% of the cases. I'd rather...
I am attempting to interpret the results from a PLS-regression done in SAS, and after the analysis SAS produces a table containing two columns labelled as corr1 and corr2.
Does anyone know what corr1 and corr2 in the output-table refers to?
Hi! I am doing an analysis on overall survival endpoint. The patients in the placebo group will be switched to treatment group in the open-label phase on voluntary base. I plan to use Rank-preserving structural failure time method (RPSFT) model. Is anyone familiar with this method and know how...
I have a DV with two outcomes. Several IVs (categorical and continuous). I want to predict the DV using the IVs, but I also have control variables (categorical and continuous) that I need to put in the equation first.
I found this code:
PROC LOGISTIC < options >;
BY variables ...
I am trying to analyze data from a split-split-plot design. The sub-plot is a continuous factor and since we suspect a non-linear relationship, the quadratic form needs to be tested as well.
Factors: a-main plot-5 levels
To test the quadratic...
Provider Charge(Total) Fraud %Fraud Fraud*%Fraud
Please ignore "§" above.
Which provider should be given alert?
I am analyzing an experiment in which we tested the effect of different treatments on trauma. So, for example, blood pressure (and other parameters) is followed in animals exposed to trauma and treated in different ways. I am using the Proc mixed procedure to analyze my data with...
I would like to model my data using a bivariate probit model but would like to explain unobserved heterogeneity of the coefficients in the model using finite mixture.
That is, I would like to explain the characteristics of the segments (sub groups) when I estimate my bivariate...
I am developing a Logistic Regression model in SAS and I have one of the independent variables as Age. I do not have exact age but I have the age buckets. Say 26 Years-30 years as bucket 1, 31 years to 35 years as bucket 2, 36 years to 40 years as bucket 3, and so on. If I include...
If I run a survival analysis, how can I graph the output/outcome?
I.e. if I run age group and incidence of a certain disease ('cancer'), and get a rate ratio for each age group, how can I put the RR on a graph with agregroup on the vertical and disease rate on the horizontal?
Sorry for the wall of text, but I'm trying to figure out how to proceed and feel as though I need to clue you in as best I can.
Whole plot: Tree species (Spp) Subplot: Location relative to canopy boundary (In/Out)
Tests: 2-way ANOVA on data collected for several...
I am trying to run an analysis with the variable "histgr" (for histology group) and the values for histgr are 1, 2, 3, 4 and 5. How can I change the reference variable value from 5 (the last value and default reference) to 3 (my desired reference variable value)?
Here is the code I have...
I know there is a statistically significant difference between groups for my non-parametric data-set but I'm not sure how to find where those differences lie between groups..
I'm comparing race/ethnicity (Asian Pacific Islander, Hispanic, etc) by academic discipline (dental...